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Cox I, Xu ZY, Grzywacz R, Ong WJ, Rasco BC, Kitamura N, Hoskins D, Neupane S, Ruland TJ, Allmond JM, King TT, Lubna RS, Rykaczewski KP, Schatz H, Sherrill BM, Tarasov OB, Ayangeakaa AD, Berg HC, Bleuel DL, Cerizza G, Christie J, Chester A, Davis J, Dembski C, Doetsch AA, Duarte JG, Estrade A, Fijałkowska A, Gray TJ, Good EC, Haak K, Hanai S, Harke JT, Harris C, Hermansen K, Hoff DEM, Jain R, Karny M, Kolos K, Laminack A, Liddick SN, Longfellow B, Lyons S, Madurga M, Mogannam MJ, Nowicki A, Ogunbeku TH, Owens-Fryar G, Rajabali MM, Richard AL, Ronning EK, Rose GE, Siegl K, Singh M, Spyrou A, Sweet A, Tsantiri A, Walters WB, Yokoyama R. Proton Shell Gaps in N=28 Nuclei from the First Complete Spectroscopy Study with FRIB Decay Station Initiator. Phys Rev Lett 2024; 132:152503. [PMID: 38682970 DOI: 10.1103/physrevlett.132.152503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 12/12/2023] [Accepted: 03/08/2024] [Indexed: 05/01/2024]
Abstract
The first complete measurement of the β-decay strength distribution of _{17}^{45}Cl_{28} was performed at the Facility for Rare Isotope Beams (FRIB) with the FRIB Decay Station Initiator during the second FRIB experiment. The measurement involved the detection of neutrons and γ rays in two focal planes of the FRIB Decay Station Initiator in a single experiment for the first time. This enabled an analytical consistency in extracting the β-decay strength distribution over the large range of excitation energies, including neutron unbound states. We observe a rapid increase in the β-decay strength distribution above the neutron separation energy in _{18}^{45}Ar_{27}. This was interpreted to be caused by the transitioning of neutrons into protons excited across the Z=20 shell gap. The SDPF-MU interaction with reduced shell gap best reproduced the data. The measurement demonstrates a new approach that is sensitive to the proton shell gap in neutron rich nuclei according to SDPF-MU calculations.
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Affiliation(s)
- I Cox
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - Z Y Xu
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - R Grzywacz
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - W-J Ong
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B C Rasco
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - N Kitamura
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - D Hoskins
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - S Neupane
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - T J Ruland
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - J M Allmond
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - T T King
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - R S Lubna
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - K P Rykaczewski
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - H Schatz
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - B M Sherrill
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - O B Tarasov
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - A D Ayangeakaa
- Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
- Triangle Universities Nuclear Laboratory, Duke University, Durham, North Carolina 27708, USA
| | - H C Berg
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - D L Bleuel
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G Cerizza
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - J Christie
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - A Chester
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - J Davis
- Pacific Northwest National Laboratory, Richland, Washington 99354, USA
| | - C Dembski
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - A A Doetsch
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - J G Duarte
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Estrade
- Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA
| | - A Fijałkowska
- Faculty of Physics, University of Warsaw, PL 02-093 Warsaw, Poland
| | - T J Gray
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - E C Good
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - K Haak
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - S Hanai
- Center for Nuclear Study, University of Tokyo, Wako, Saitama 351-0198, Japan
| | - J T Harke
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C Harris
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - K Hermansen
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - D E M Hoff
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Jain
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Karny
- Faculty of Physics, University of Warsaw, PL 02-093 Warsaw, Poland
| | - K Kolos
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Laminack
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - S N Liddick
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - B Longfellow
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S Lyons
- Pacific Northwest National Laboratory, Richland, Washington 99354, USA
| | - M Madurga
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - M J Mogannam
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - A Nowicki
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - T H Ogunbeku
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - G Owens-Fryar
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - M M Rajabali
- Physics Department, Tennessee Technological University, Cookeville, Tennessee 38505, USA
| | - A L Richard
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - E K Ronning
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - G E Rose
- University of California, Berkeley, Berkeley, California 94704, USA
| | - K Siegl
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - M Singh
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - A Spyrou
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - A Sweet
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Tsantiri
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - W B Walters
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
| | - R Yokoyama
- Center for Nuclear Study, University of Tokyo, Wako, Saitama 351-0198, Japan
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2
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Rocchini M, Garrett PE, Zielińska M, Lenzi SM, Dao DD, Nowacki F, Bildstein V, MacLean AD, Olaizola B, Ahmed ZT, Andreoiu C, Babu A, Ball GC, Bhattacharjee SS, Bidaman H, Cheng C, Coleman R, Dillmann I, Garnsworthy AB, Gillespie S, Griffin CJ, Grinyer GF, Hackman G, Hanley M, Illana A, Jones S, Laffoley AT, Leach KG, Lubna RS, McAfee J, Natzke C, Pannu S, Paxman C, Porzio C, Radich AJ, Rajabali MM, Sarazin F, Schwarz K, Shadrick S, Sharma S, Suh J, Svensson CE, Yates D, Zidar T. First Evidence of Axial Shape Asymmetry and Configuration Coexistence in ^{74}Zn: Suggestion for a Northern Extension of the N=40 Island of Inversion. Phys Rev Lett 2023; 130:122502. [PMID: 37027859 DOI: 10.1103/physrevlett.130.122502] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 11/28/2022] [Accepted: 02/09/2023] [Indexed: 06/19/2023]
Abstract
The excited states of N=44 ^{74}Zn were investigated via γ-ray spectroscopy following ^{74}Cu β decay. By exploiting γ-γ angular correlation analysis, the 2_{2}^{+}, 3_{1}^{+}, 0_{2}^{+}, and 2_{3}^{+} states in ^{74}Zn were firmly established. The γ-ray branching and E2/M1 mixing ratios for transitions deexciting the 2_{2}^{+}, 3_{1}^{+}, and 2_{3}^{+} states were measured, allowing for the extraction of relative B(E2) values. In particular, the 2_{3}^{+}→0_{2}^{+} and 2_{3}^{+}→4_{1}^{+} transitions were observed for the first time. The results show excellent agreement with new microscopic large-scale shell-model calculations, and are discussed in terms of underlying shapes, as well as the role of neutron excitations across the N=40 gap. Enhanced axial shape asymmetry (triaxiality) is suggested to characterize ^{74}Zn in its ground state. Furthermore, an excited K=0 band with a significantly larger softness in its shape is identified. A shore of the N=40 "island of inversion" appears to manifest above Z=26, previously thought as its northern limit in the chart of the nuclides.
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Affiliation(s)
- M Rocchini
- Department of Physics, University of Guelph, N1G 2W1 Guelph, Canada
| | - P E Garrett
- Department of Physics, University of Guelph, N1G 2W1 Guelph, Canada
| | - M Zielińska
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
| | - S M Lenzi
- Dipartimento di Fisica, Università di Padova, I-35122 Padova, Italy
- INFN Sezione di Padova, I-35131 Padova, Italy
| | - D D Dao
- Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
| | - F Nowacki
- Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
| | - V Bildstein
- Department of Physics, University of Guelph, N1G 2W1 Guelph, Canada
| | - A D MacLean
- Department of Physics, University of Guelph, N1G 2W1 Guelph, Canada
| | | | - Z T Ahmed
- Department of Physics, University of Guelph, N1G 2W1 Guelph, Canada
| | - C Andreoiu
- Department of Chemistry, Simon Fraser University, V5A 1S6 Burnaby, Canada
| | - A Babu
- TRIUMF, V6T 2A3 Vancouver, Canada
| | - G C Ball
- TRIUMF, V6T 2A3 Vancouver, Canada
| | | | - H Bidaman
- Department of Physics, University of Guelph, N1G 2W1 Guelph, Canada
| | - C Cheng
- TRIUMF, V6T 2A3 Vancouver, Canada
| | - R Coleman
- Department of Physics, University of Guelph, N1G 2W1 Guelph, Canada
| | - I Dillmann
- TRIUMF, V6T 2A3 Vancouver, Canada
- Department of Physics and Astronomy, University of Victoria, V8P 5C2 Victoria, Canada
| | | | | | | | - G F Grinyer
- Department of Physics, University of Regina, S4S 0A2 Regina, Canada
| | | | - M Hanley
- Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA
| | - A Illana
- Accelerator Laboratory, Department of Physics, University of Jyväskylä, FI-40014 Jyväskylä, Finland
| | - S Jones
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - A T Laffoley
- Department of Physics, University of Guelph, N1G 2W1 Guelph, Canada
| | - K G Leach
- Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA
| | | | - J McAfee
- TRIUMF, V6T 2A3 Vancouver, Canada
- Department of Physics, University of Surrey, GU2 7XH Guildford, United Kingdom
| | - C Natzke
- TRIUMF, V6T 2A3 Vancouver, Canada
- Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA
| | - S Pannu
- Department of Physics, University of Guelph, N1G 2W1 Guelph, Canada
| | - C Paxman
- TRIUMF, V6T 2A3 Vancouver, Canada
- Department of Physics, University of Surrey, GU2 7XH Guildford, United Kingdom
| | - C Porzio
- TRIUMF, V6T 2A3 Vancouver, Canada
- INFN Sezione di Milano, I-20133 Milano, Italy
- Dipartimento di Fisica, Università di Milano, I-20133 Milano, Italy
| | - A J Radich
- Department of Physics, University of Guelph, N1G 2W1 Guelph, Canada
| | - M M Rajabali
- Physics Department, Tennessee Technological University, Cookeville, Tennessee 38505, USA
| | - F Sarazin
- Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA
| | | | - S Shadrick
- Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA
| | - S Sharma
- Department of Physics, University of Regina, S4S 0A2 Regina, Canada
| | - J Suh
- Department of Physics, University of Regina, S4S 0A2 Regina, Canada
| | - C E Svensson
- Department of Physics, University of Guelph, N1G 2W1 Guelph, Canada
| | - D Yates
- TRIUMF, V6T 2A3 Vancouver, Canada
- Department of Physics and Astronomy, University of British Columbia, V6T 1Z4 Vancouver, Canada
| | - T Zidar
- Department of Physics, University of Guelph, N1G 2W1 Guelph, Canada
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3
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Garcia FH, Andreoiu C, Ball GC, Bell A, Garnsworthy AB, Nowacki F, Petrache CM, Poves A, Whitmore K, Ali FA, Bernier N, Bhattacharjee SS, Bowry M, Coleman RJ, Dillmann I, Djianto I, Forney AM, Gascoine M, Hackman G, Leach KG, Murphy AN, Natzke CR, Olaizola B, Ortner K, Peters EE, Rajabali MM, Raymond K, Svensson CE, Umashankar R, Williams J, Yates D. Absence of Low-Energy Shape Coexistence in ^{80}Ge: The Nonobservation of a Proposed Excited 0_{2}^{+} Level at 639 keV. Phys Rev Lett 2020; 125:172501. [PMID: 33156683 DOI: 10.1103/physrevlett.125.172501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 08/19/2020] [Accepted: 09/18/2020] [Indexed: 06/11/2023]
Abstract
The ^{80}Ge structure was investigated in a high-statistics β-decay experiment of ^{80}Ga using the GRIFFIN spectrometer at TRIUMF-ISAC through γ, β-e, e-γ, and γ-γ spectroscopy. No evidence was found for the recently reported 0_{2}^{+} 639-keV level suggested as evidence for low-energy shape coexistence in ^{80}Ge. Large-scale shell model calculations performed in ^{78,80,82}Ge place the 0_{2}^{+} level in ^{80}Ge at 2 MeV. The new experimental evidence combined with shell model predictions indicate that low-energy shape coexistence is not present in ^{80}Ge.
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Affiliation(s)
- F H Garcia
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - C Andreoiu
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - G C Ball
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - A Bell
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - A B Garnsworthy
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - F Nowacki
- Université de Strasbourg, IPHC, 23 rue du Loess 67037 Strasbourg, France
- CNRS, UMR7178, 67037 Strasbourg, France
| | - C M Petrache
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
| | - A Poves
- Departamento de Física Teórica and IFTUAM/CSIC, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - K Whitmore
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - F A Ali
- Department of Physics, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
- Department of Physics, College of Education, University of Sulaimani, P.O. Box 334, Sulaimani, Kurdistan Region, Iraq
| | - N Bernier
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - S S Bhattacharjee
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - M Bowry
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - R J Coleman
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - I Dillmann
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia V8P 5C2, Canada
| | - I Djianto
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - A M Forney
- Department of Chemistry and Biochemistry, University of Maryland College Park, College Park, Maryland 20742, USA
| | - M Gascoine
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - G Hackman
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - K G Leach
- Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA
| | - A N Murphy
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - C R Natzke
- Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3, Canada
| | - B Olaizola
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3, Canada
| | - K Ortner
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - E E Peters
- Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055, USA
| | - M M Rajabali
- Department of Physics, Tennessee Technological University, Cookeville, Tennessee 38505, USA
| | - K Raymond
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - C E Svensson
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - R Umashankar
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3, Canada
| | - J Williams
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - D Yates
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3, Canada
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4
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Kolos K, Miller D, Grzywacz R, Iwasaki H, Al-Shudifat M, Bazin D, Bingham CR, Braunroth T, Cerizza G, Gade A, Lemasson A, Liddick SN, Madurga M, Morse C, Portillo M, Rajabali MM, Recchia F, Riedinger LL, Voss P, Walters WB, Weisshaar D, Whitmore K, Wimmer K, Tostevin JA. Publisher's Note: Direct Lifetime Measurements of the Excited States in ^{72}Ni [Phys. Rev. Lett. 116, 122502 (2016)]. Phys Rev Lett 2020; 124:209901. [PMID: 32501080 DOI: 10.1103/physrevlett.124.209901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Indexed: 06/11/2023]
Abstract
This corrects the article DOI: 10.1103/PhysRevLett.116.122502.
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5
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Lubos D, Park J, Faestermann T, Gernhäuser R, Krücken R, Lewitowicz M, Nishimura S, Sakurai H, Ahn DS, Baba H, Blank B, Blazhev A, Boutachkov P, Browne F, Čeliković I, de France G, Doornenbal P, Fang Y, Fukuda N, Giovinazzo J, Goel N, Górska M, Ilieva S, Inabe N, Isobe T, Jungclaus A, Kameda D, Kim YK, Kojouharov I, Kubo T, Kurz N, Kwon YK, Lorusso G, Moschner K, Murai D, Nishizuka I, Patel Z, Rajabali MM, Rice S, Schaffner H, Shimizu Y, Sinclair L, Söderström PA, Steiger K, Sumikama T, Suzuki H, Takeda H, Wang Z, Warr N, Watanabe H, Wu J, Xu Z. Improved Value for the Gamow-Teller Strength of the ^{100}Sn Beta Decay. Phys Rev Lett 2019; 122:222502. [PMID: 31283269 DOI: 10.1103/physrevlett.122.222502] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Revised: 04/11/2019] [Indexed: 06/09/2023]
Abstract
A record number of ^{100}Sn nuclei was detected and new isotopic species toward the proton dripline were discovered at the RIKEN Nishina Center. Decay spectroscopy was performed with the high-efficiency detector arrays WAS3ABi and EURICA. Both the half-life and the β-decay end point energy of ^{100}Sn were measured more precisely than the literature values. The value and the uncertainty of the resulting strength for the pure 0^{+}→1^{+} Gamow-Teller decay was improved to B_{GT}=4.4_{-0.7}^{+0.9}. A discrimination between different model calculations was possible for the first time, and the level scheme of ^{100}In is investigated further.
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Affiliation(s)
- D Lubos
- Physik Department E12, Technische Universität München, D-85748 Garching, Germany
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - J Park
- TRIUMF, Vancouver British Columbia, V6T 2A3, Canada
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - T Faestermann
- Physik Department E12, Technische Universität München, D-85748 Garching, Germany
- Excellence Cluster "Origin and Structure of the Universe", D-85748, Garching, Germany
| | - R Gernhäuser
- Physik Department E12, Technische Universität München, D-85748 Garching, Germany
| | - R Krücken
- Physik Department E12, Technische Universität München, D-85748 Garching, Germany
- TRIUMF, Vancouver British Columbia, V6T 2A3, Canada
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - M Lewitowicz
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Boulevard H. Becquerel, 14076 Caen, France
| | - S Nishimura
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Sakurai
- University of Tokyo, 7-3-1 Hongo Bunkyo, Tokyo 113-0033, Japan
| | - D S Ahn
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Baba
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - B Blank
- CEN Bordeaux-Gradignan Le Haut-Vigneau, F-33175 Gradignan Cedex, France
| | - A Blazhev
- Institute of Nuclear Physics, University of Cologne, D-50937 Cologne, Germany
| | - P Boutachkov
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
| | - F Browne
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- School of Computing, Engineering and Mathematics, University of Brighton, Brighton, BN2 4GJ, United Kingdom
| | - I Čeliković
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Boulevard H. Becquerel, 14076 Caen, France
- "Vinča" Institute of Nuclear Sciences, University of Belgrade, 11000 Belgrade, Serbia
| | - G de France
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Boulevard H. Becquerel, 14076 Caen, France
| | - P Doornenbal
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Fang
- Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| | - N Fukuda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - J Giovinazzo
- CEN Bordeaux-Gradignan Le Haut-Vigneau, F-33175 Gradignan Cedex, France
| | - N Goel
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
| | - M Górska
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
| | - S Ilieva
- Technische Universität Darmstadt, D-64289 Darmstadt, Germany
| | - N Inabe
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - T Isobe
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - A Jungclaus
- Instituto de Estructura de la Materia, IEM-CSIC, E-28006 Madrid, Spain
| | - D Kameda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y K Kim
- Rare Isotope Science Project, Institute for Basic Science, Daejeon 305-811, Republic of Korea
- Department of Nuclear Engineering, Hanyang University, Seoul 133-791, Republic of Korea
| | - I Kojouharov
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
| | - T Kubo
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - N Kurz
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
| | - Y K Kwon
- Rare Isotope Science Project, Institute for Basic Science, Daejeon 305-811, Republic of Korea
| | - G Lorusso
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Moschner
- Institute of Nuclear Physics, University of Cologne, D-50937 Cologne, Germany
| | - D Murai
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - I Nishizuka
- Department of Physics, Faculty of Science, Tohoku University, Sendai 980-0845, Japan
| | - Z Patel
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - M M Rajabali
- TRIUMF, Vancouver British Columbia, V6T 2A3, Canada
- Physics Department, Tennessee Technological University, Cookeville, Tennessee 38505, USA
| | - S Rice
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - H Schaffner
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
| | - Y Shimizu
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - L Sinclair
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- University of York, York YO10 5DD, United Kingdom
| | - P-A Söderström
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Steiger
- Physik Department E12, Technische Universität München, D-85748 Garching, Germany
| | - T Sumikama
- Department of Physics, Faculty of Science, Tohoku University, Sendai 980-0845, Japan
| | - H Suzuki
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Takeda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Z Wang
- TRIUMF, Vancouver British Columbia, V6T 2A3, Canada
| | - N Warr
- Institute of Nuclear Physics, University of Cologne, D-50937 Cologne, Germany
| | - H Watanabe
- Beihang University, Beijing 100191, China
| | - J Wu
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Peking University, Beijing 100871, China
| | - Z Xu
- University of Tokyo, 7-3-1 Hongo Bunkyo, Tokyo 113-0033, Japan
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6
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Hammen M, Nörtershäuser W, Balabanski DL, Bissell ML, Blaum K, Budinčević I, Cheal B, Flanagan KT, Frömmgen N, Georgiev G, Geppert C, Kowalska M, Kreim K, Krieger A, Nazarewicz W, Neugart R, Neyens G, Papuga J, Reinhard PG, Rajabali MM, Schmidt S, Yordanov DT. From Calcium to Cadmium: Testing the Pairing Functional through Charge Radii Measurements of ^{100-130}Cd. Phys Rev Lett 2018; 121:102501. [PMID: 30240248 DOI: 10.1103/physrevlett.121.102501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Indexed: 06/08/2023]
Abstract
Differences in mean-square nuclear charge radii of ^{100-130}Cd are extracted from high-resolution collinear laser spectroscopy of the 5s ^{2}S_{1/2}→5p ^{2}P_{3/2} transition of the ion and from the 5s5p ^{3}P_{2}→5s6s ^{3}S_{1} transition in atomic Cd. The radii show a smooth parabolic behavior on top of a linear trend and a regular odd-even staggering across the almost complete sdgh shell. They serve as a first test for a recently established new Fayans functional and show a remarkably good agreement in the trend as well as in the total nuclear charge radius.
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Affiliation(s)
- M Hammen
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, Fritz-Straßmann Weg 2, 55128 Mainz, Germany
| | - W Nörtershäuser
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, Fritz-Straßmann Weg 2, 55128 Mainz, Germany
- Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany
| | - D L Balabanski
- INRNE, Bulgarian Academy of Science, BG-1784 Sofia, Bulgaria
| | - M L Bissell
- Instituut voor Kern- en Stralingsfysica, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
- Photon Science Institute, School of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, United Kingdom
| | - K Blaum
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - I Budinčević
- Instituut voor Kern- en Stralingsfysica, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
| | - B Cheal
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom
| | - K T Flanagan
- Photon Science Institute, School of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, United Kingdom
| | - N Frömmgen
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, Fritz-Straßmann Weg 2, 55128 Mainz, Germany
| | - G Georgiev
- CSNSM-IN2P3-CNRS, Université de Paris Sud, F-91405 Orsay, France
| | - Ch Geppert
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, Fritz-Straßmann Weg 2, 55128 Mainz, Germany
- Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany
| | - M Kowalska
- CERN European Organization for Nuclear Research, Physics Department, CH-1211 Geneva 23, Switzerland
| | - K Kreim
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - A Krieger
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, Fritz-Straßmann Weg 2, 55128 Mainz, Germany
- Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany
| | - W Nazarewicz
- Department of Physics and Astronomy and FRIB Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - R Neugart
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, Fritz-Straßmann Weg 2, 55128 Mainz, Germany
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - G Neyens
- CERN European Organization for Nuclear Research, Physics Department, CH-1211 Geneva 23, Switzerland
- Instituut voor Kern- en Stralingsfysica, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
| | - J Papuga
- Instituut voor Kern- en Stralingsfysica, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
| | - P-G Reinhard
- Institut für Theoretische Physik II, Universität Erlangen-Nürnberg, 91058 Erlangen, Germany
| | - M M Rajabali
- Instituut voor Kern- en Stralingsfysica, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
| | - S Schmidt
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, Fritz-Straßmann Weg 2, 55128 Mainz, Germany
- Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany
| | - D T Yordanov
- CERN European Organization for Nuclear Research, Physics Department, CH-1211 Geneva 23, Switzerland
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
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7
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Jigmeddorj B, E. Garrett P, Andreoiu C, C. Ball G, Bruhn T, S. Cross D, B. Garnsworthy A, Hadinia B, Moukaddam M, Park J, L. Pore J, J. Radich A, M. Rajabali M, T. Rand E, Rizwan U, E. Svensson C, Voss P, M. Wang Z, L. Wood J, W. Yates S. New low-spin states of 122Xe observed via high-statistics β-decay of 122Cs. EPJ Web Conf 2018. [DOI: 10.1051/epjconf/201817802026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Excited states of 122Xe were studied via the β+/EC decay of 122Cs with the 8π γ-ray spectrometer at the TRIUMF-ISAC facility. Compton-suppressed HPGe detectors were used for measurements of γ-ray intensities, γγ coincidences, and γ-γ angular correlations. Two sets of data were collected to optimize the decays of the ground (21.2 s) and isomeric (3.7 min) states of 122Cs. The data collected have enabled the observation of about 505 new transitions and about 250 new levels, including 51 new low-spin states. Spin assignments have been made for 58 low-spin states based on the deduced β-decay feeding and γ-γ angular correlation analyses.
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8
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Pesudo V, Borge MJG, Moro AM, Lay JA, Nácher E, Gómez-Camacho J, Tengblad O, Acosta L, Alcorta M, Alvarez MAG, Andreoiu C, Bender PC, Braid R, Cubero M, Di Pietro A, Fernández-García JP, Figuera P, Fisichella M, Fulton BR, Garnsworthy AB, Hackman G, Hager U, Kirsebom OS, Kuhn K, Lattuada M, Marquínez-Durán G, Martel I, Miller D, Moukaddam M, O'Malley PD, Perea A, Rajabali MM, Sánchez-Benítez AM, Sarazin F, Scuderi V, Svensson CE, Unsworth C, Wang ZM. Scattering of the Halo Nucleus ^{11}Be on ^{197}Au at Energies around the Coulomb Barrier. Phys Rev Lett 2017; 118:152502. [PMID: 28452556 DOI: 10.1103/physrevlett.118.152502] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Indexed: 06/07/2023]
Abstract
Angular distributions of the elastic, inelastic, and breakup cross sections of the halo nucleus ^{11}Be on ^{197}Au were measured at energies below (E_{lab}=31.9 MeV) and around (39.6 MeV) the Coulomb barrier. These three channels were unambiguously separated for the first time for reactions of ^{11}Be on a high-Z target at low energies. The experiment was performed at TRIUMF (Vancouver, Canada). The differential cross sections were compared with three different calculations: semiclassical, inert-core continuum-coupled-channels and continuum-coupled-channels ones with including core deformation. These results show conclusively that the elastic and inelastic differential cross sections can only be accounted for if core-excited admixtures are taken into account. The cross sections for these channels strongly depend on the B(E1) distribution in ^{11}Be, and the reaction mechanism is sensitive to the entanglement of core and halo degrees of freedom in ^{11}Be.
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Affiliation(s)
- V Pesudo
- Instituto de Estructura de la Materia, CSIC, 28006 Madrid, Spain
- Department of Physics, University of the Western Cape, P/B X17, Bellville ZA-7535, South Africa
- iThemba LABS, Somerset West 7129, South Africa
| | - M J G Borge
- Instituto de Estructura de la Materia, CSIC, 28006 Madrid, Spain
- ISOLDE-EP, CERN, CH-1211 Geneva 23, Switzerland
| | - A M Moro
- Departamento de FAMN, Universidad de Sevilla, 41080 Sevilla, Spain
| | - J A Lay
- Dipartimento di Fisica e Astr. "Galileo Galilei", Univ. di Padova, 35131 Padova, Italy
- INFN, Sezione di Padova, via Marzolo, 8, 35131 Padova, Italy
| | - E Nácher
- Instituto de Estructura de la Materia, CSIC, 28006 Madrid, Spain
| | - J Gómez-Camacho
- Departamento de FAMN, Universidad de Sevilla, 41080 Sevilla, Spain
- CN de Aceleradores (U. Sevilla, J. Andalucía, CSIC), 41092 Sevilla, Spain
| | - O Tengblad
- Instituto de Estructura de la Materia, CSIC, 28006 Madrid, Spain
| | - L Acosta
- Instituto de Física, Universidad Nacional Autónoma de México, A.P. 20-364, Cd.Mx. 01000 Mexico
| | - M Alcorta
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - M A G Alvarez
- Instituto de Física, Universidade de São Paulo, 05508-090 São Paulo, Brazil
| | - C Andreoiu
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
| | - P C Bender
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - R Braid
- Physics Department, Colorado School of Mines, Golden, Colorado 80401, USA
| | - M Cubero
- Instituto de Estructura de la Materia, CSIC, 28006 Madrid, Spain
- CICANUM, Universidad de Costa Rica, Apdo. 2060 San José, Costa Rica
| | - A Di Pietro
- Laboratori Nazionali del Sud, INFN, via Santa Sofia 62, 95123 Catania, Italy
| | - J P Fernández-García
- Departamento de FAMN, Universidad de Sevilla, 41080 Sevilla, Spain
- Laboratori Nazionali del Sud, INFN, via Santa Sofia 62, 95123 Catania, Italy
- CN de Aceleradores (U. Sevilla, J. Andalucía, CSIC), 41092 Sevilla, Spain
| | - P Figuera
- Laboratori Nazionali del Sud, INFN, via Santa Sofia 62, 95123 Catania, Italy
| | - M Fisichella
- Laboratori Nazionali del Sud, INFN, via Santa Sofia 62, 95123 Catania, Italy
| | - B R Fulton
- Department of Physics, University of York, YO 10 5DD Heslington, York, United Kingdom
| | - A B Garnsworthy
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - G Hackman
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - U Hager
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - O S Kirsebom
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics and Astronomy, Aarhus University, 8000 Aarhus, Denmark
| | - K Kuhn
- Physics Department, Colorado School of Mines, Golden, Colorado 80401, USA
| | - M Lattuada
- Laboratori Nazionali del Sud, INFN, via Santa Sofia 62, 95123 Catania, Italy
- Dipartimento di Fisica e Astronomia, via Santa Sofia 64, 95123 Catania, Italy
| | - G Marquínez-Durán
- Departamento de Ciencias integradas, Universidad de Huelva, 21071 Huelva, Spain
| | - I Martel
- Departamento de Ciencias integradas, Universidad de Huelva, 21071 Huelva, Spain
| | - D Miller
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - M Moukaddam
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - P D O'Malley
- Physics Department, Colorado School of Mines, Golden, Colorado 80401, USA
| | - A Perea
- Instituto de Estructura de la Materia, CSIC, 28006 Madrid, Spain
| | - M M Rajabali
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - A M Sánchez-Benítez
- Departamento de Ciencias integradas, Universidad de Huelva, 21071 Huelva, Spain
| | - F Sarazin
- Physics Department, Colorado School of Mines, Golden, Colorado 80401, USA
| | - V Scuderi
- Laboratori Nazionali del Sud, INFN, via Santa Sofia 62, 95123 Catania, Italy
| | - C E Svensson
- Department of Physics. University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - C Unsworth
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - Z M Wang
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
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9
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Rasco BC, Wolińska-Cichocka M, Fijałkowska A, Rykaczewski KP, Karny M, Grzywacz RK, Goetz KC, Gross CJ, Stracener DW, Zganjar EF, Batchelder JC, Blackmon JC, Brewer NT, Go S, Heffron B, King T, Matta JT, Miernik K, Nesaraja CD, Paulauskas SV, Rajabali MM, Wang EH, Winger JA, Xiao Y, Zachary CJ. Decays of the Three Top Contributors to the Reactor ν[over ¯]_{e} High-Energy Spectrum, ^{92}Rb, ^{96gs}Y, and ^{142}Cs, Studied with Total Absorption Spectroscopy. Phys Rev Lett 2016; 117:092501. [PMID: 27610847 DOI: 10.1103/physrevlett.117.092501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Indexed: 06/06/2023]
Abstract
We report total absorption spectroscopy measurements of ^{92}Rb, ^{96gs}Y, and ^{142}Cs β decays, which are the most important contributors to the high energy ν[over ¯]_{e} spectral shape in nuclear reactors. These three β decays contribute 43% of the ν[over ¯]_{e} flux near 5.5 MeV emitted by nuclear reactors. This ν[over ¯]_{e} energy is particularly interesting due to spectral features recently observed in several experiments including the Daya Bay, Double Chooz, and RENO Collaborations. Measurements were conducted at Oak Ridge National Laboratory by means of proton-induced fission of ^{238}U with on-line mass separation of fission fragments and the Modular Total Absorption Spectrometer. We observe a β-decay pattern that is similar to recent measurements of ^{92}Rb, with a ground-state to ground-state β feeding of 91(3)%. We verify the ^{96gs}Y ground-state to ground-state β feeding of 95.5(20)%. Our measurements substantially modify the β-decay feedings of ^{142}Cs, reducing the β feeding to ^{142}Ba states below 2 MeV by 32% when compared with the latest evaluations. Our results increase the discrepancy between the observed and the expected reactor ν[over ¯]_{e} flux between 5 and 7 MeV, the maximum excess increases from ∼10% to ∼12%.
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Affiliation(s)
- B C Rasco
- JINPA, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - M Wolińska-Cichocka
- JINPA, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Heavy Ion Laboratory, University of Warsaw, PL-02-093 Warsaw, Poland
| | - A Fijałkowska
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
- Faculty of Physics, University of Warsaw, PL-02-093 Warsaw, Poland
| | - K P Rykaczewski
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M Karny
- JINPA, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Faculty of Physics, University of Warsaw, PL-02-093 Warsaw, Poland
| | - R K Grzywacz
- JINPA, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - K C Goetz
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
- CIRE Bredesen Center, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - C J Gross
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - D W Stracener
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - E F Zganjar
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803 USA
| | - J C Batchelder
- JINPA, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Nuclear Engineering, University of California, Berkeley, Berkeley California 94720, USA
| | - J C Blackmon
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803 USA
| | - N T Brewer
- JINPA, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - S Go
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - B Heffron
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - T King
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - J T Matta
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - K Miernik
- JINPA, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Faculty of Physics, University of Warsaw, PL-02-093 Warsaw, Poland
| | - C D Nesaraja
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - S V Paulauskas
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - M M Rajabali
- Department of Physics, Tennessee Technological University, Cookeville, Tennessee 38505, USA
| | - E H Wang
- Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA
| | - J A Winger
- Department of Physics and Astronomy, Mississippi State University, Mississippi State, Mississippi 39762, USA
| | - Y Xiao
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - C J Zachary
- Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA
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10
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Dunlop MR, Svensson CE, Ball GC, Grinyer GF, Leslie JR, Andreoiu C, Austin RAE, Ballast T, Bender PC, Bildstein V, Diaz Varela A, Dunlop R, Garnsworthy AB, Garrett PE, Hackman G, Hadinia B, Jamieson DS, Laffoley AT, MacLean AD, Miller DM, Mills WJ, Park J, Radich AJ, Rajabali MM, Rand ET, Unsworth C, Valencik A, Wang ZM, Zganjar EF. High-Precision Half-Life Measurements for the Superallowed β^{+} Emitter ^{10}C: Implications for Weak Scalar Currents. Phys Rev Lett 2016; 116:172501. [PMID: 27176517 DOI: 10.1103/physrevlett.116.172501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Indexed: 06/05/2023]
Abstract
Precision measurements of superallowed Fermi β-decay transitions, particularly for the lightest superallowed emitters ^{10}C and ^{14}O, set stringent limits on possible scalar current contributions to the weak interaction. In the present work, a discrepancy between recent measurements of the ^{10}C half-life is addressed through two high-precision half-life measurements, via γ-ray photopeak and β counting, that yield consistent results for the ^{10}C half-life of T_{1/2}=19.2969±0.0074 s and T_{1/2}=19.3009±0.0017 s, respectively. The latter is the most precise superallowed β-decay half-life measurement reported to date and the first to achieve a relative precision below 10^{-4}. A fit to the world superallowed β-decay data including the ^{10}C half-life measurements reported here yields b_{F}=-0.0018±0.0021 (68% C.L.) for the Fierz interference term and C_{S}/C_{V}=+0.0009±0.0011 for the ratio of the weak scalar to vector couplings assuming left-handed neutrinos.
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Affiliation(s)
- M R Dunlop
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - C E Svensson
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - G C Ball
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - G F Grinyer
- GANIL, CEA/DRF-CNRS/IN2P3, Bvd Henri Becquerel, 14076 Caen, France
| | - J R Leslie
- Department of Physics, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - C Andreoiu
- Department of Chemistry, Simon Fraser University, Burnaby, British Colombia V5A 1S6, Canada
| | - R A E Austin
- Department of Astronomy and Physics, Saint Mary's University, Halifax, Nova Scotia, B3H 3C3, Canada
| | - T Ballast
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - P C Bender
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - V Bildstein
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - A Diaz Varela
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - R Dunlop
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - A B Garnsworthy
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - P E Garrett
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - G Hackman
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - B Hadinia
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - D S Jamieson
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - A T Laffoley
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - A D MacLean
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - D M Miller
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - W J Mills
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - J Park
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - A J Radich
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - M M Rajabali
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - E T Rand
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - C Unsworth
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - A Valencik
- Department of Astronomy and Physics, Saint Mary's University, Halifax, Nova Scotia, B3H 3C3, Canada
| | - Z M Wang
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - E F Zganjar
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana, 70803, USA
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11
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Kolos K, Miller D, Grzywacz R, Iwasaki H, Al-Shudifat M, Bazin D, Bingham CR, Braunroth T, Cerizza G, Gade A, Lemasson A, Liddick SN, Madurga M, Morse C, Portillo M, Rajabali MM, Recchia F, Riedinger LL, Voss P, Walters WB, Weisshaar D, Whitmore K, Wimmer K, Tostevin JA. Direct Lifetime Measurements of the Excited States in (72)Ni. Phys Rev Lett 2016; 116:122502. [PMID: 27058074 DOI: 10.1103/physrevlett.116.122502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Indexed: 06/05/2023]
Abstract
The lifetimes of the first excited 2^{+} and 4^{+} states in ^{72}Ni were measured at the National Superconducting Cyclotron Laboratory with the recoil-distance Doppler-shift method, a model-independent probe to obtain the reduced transition probability. Excited states in ^{72}Ni were populated by the one-proton knockout reaction of an intermediate energy ^{73}Cu beam. γ-ray-recoil coincidences were detected with the γ-ray tracking array GRETINA and the S800 spectrograph. Our results provide evidence of enhanced transition probability B(E2;2^{+}→0^{+}) as compared to ^{68}Ni, but do not confirm the trend of large B(E2) values reported in the neighboring isotope ^{70}Ni obtained from Coulomb excitation measurement. The results are compared to shell model calculations. The lifetime obtained for the excited 4_{1}^{+} state is consistent with models showing decay of a seniority ν=4, 4^{+} state, which is consistent with the disappearance of the 8^{+} isomer in ^{72}Ni.
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Affiliation(s)
- K Kolos
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - D Miller
- TRIUMF, 4004 Westbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - R Grzywacz
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6371, USA
| | - H Iwasaki
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Al-Shudifat
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - D Bazin
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA
| | - C R Bingham
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6371, USA
| | - T Braunroth
- Institut für Kernphysik der Universität zu Köln, D-50937 Köln, Germany
| | - G Cerizza
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - A Gade
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - A Lemasson
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA
| | - S N Liddick
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Madurga
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - C Morse
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Portillo
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA
| | - M M Rajabali
- TRIUMF, 4004 Westbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - F Recchia
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA
| | - L L Riedinger
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6371, USA
| | - P Voss
- Simon Fraser University, Burnaby, British Columbia, V5A 1S6, Canada
| | - W B Walters
- University of Maryland, College Park, Maryland 20742, USA
| | - D Weisshaar
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA
| | - K Whitmore
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - K Wimmer
- Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA
| | - J A Tostevin
- Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
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12
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Yordanov DT, Balabanski DL, Bissell ML, Blaum K, Budinčević I, Cheal B, Flanagan K, Frömmgen N, Georgiev G, Geppert C, Hammen M, Kowalska M, Kreim K, Krieger A, Meng J, Neugart R, Neyens G, Nörtershäuser W, Rajabali MM, Papuga J, Schmidt S, Zhao PW. Simple Nuclear Structure in (111-129)Cd from Atomic Isomer Shifts. Phys Rev Lett 2016; 116:032501. [PMID: 26849588 DOI: 10.1103/physrevlett.116.032501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Indexed: 06/05/2023]
Abstract
Isomer shifts have been determined in ^{111-129}Cd by high-resolution laser spectroscopy at CERN-ISOLDE. The corresponding mean square charge-radii changes, from the 1/2^{+} and the 3/2^{+} ground states to the 11/2^{-} isomers, have been found to follow a distinct parabolic dependence as a function of the atomic mass number. Since the isomers have been previously associated with simplicity due to the linear mass dependence of their quadrupole moments, the regularity of the isomer shifts suggests a higher order of symmetry affecting the ground states in addition. A comprehensive description assuming nuclear deformation is found to accurately reproduce the radii differences in conjunction with the known quadrupole moments. This intuitive interpretation is supported by covariant density functional theory.
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Affiliation(s)
- D T Yordanov
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay, France
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
- CERN European Organization for Nuclear Research, Physics Department, 1211 Geneva 23, Switzerland
| | - D L Balabanski
- ELI-NP, Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering, 077125 Magurele, Romania
| | - M L Bissell
- Instituut voor Kern- en Stralingsfysica, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
| | - K Blaum
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - I Budinčević
- Instituut voor Kern- en Stralingsfysica, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
| | - B Cheal
- Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom
| | - K Flanagan
- School of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, United Kingdom
| | - N Frömmgen
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany
| | - G Georgiev
- CSNSM, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, 91405 Orsay, France
| | - Ch Geppert
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - M Hammen
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany
| | - M Kowalska
- CERN European Organization for Nuclear Research, Physics Department, 1211 Geneva 23, Switzerland
| | - K Kreim
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
| | - A Krieger
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany
| | - J Meng
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - R Neugart
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany
| | - G Neyens
- Instituut voor Kern- en Stralingsfysica, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
| | - W Nörtershäuser
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany
- Institut fur Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - M M Rajabali
- Instituut voor Kern- en Stralingsfysica, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
| | - J Papuga
- Instituut voor Kern- en Stralingsfysica, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
| | - S Schmidt
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
| | - P W Zhao
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
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13
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Garrett PE, Jigmeddorj B, Radich AJ, Andreoiu C, Ball GC, Bangay JC, Bianco L, Bildstein V, Chagnon-Lessard S, Cross DS, Demand GA, Diaz Varela A, Dunlop R, Finlay P, Garnsworthy AB, Green KL, Hackman G, Hadinia B, Leach KG, Michetti-Wilson J, Orce JN, Rajabali MM, Rand ET, Starosta K, Sumithrarachchi C, Svensson CE, Triambak S, Wang ZM, Williams SJ, Wood JL, Wong J, Yates SW, Zganjar EF. Conversion electrons from high-statistics β-decay measurements with the 8 πspectrometer at TRIUMF-ISAC. EPJ Web Conf 2016. [DOI: 10.1051/epjconf/201612302005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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14
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Bissell ML, Papuga J, Naïdja H, Kreim K, Blaum K, De Rydt M, Garcia Ruiz RF, Heylen H, Kowalska M, Neugart R, Neyens G, Nörtershäuser W, Nowacki F, Rajabali MM, Sanchez R, Sieja K, Yordanov DT. Proton-neutron pairing correlations in the self-conjugate nucleus (38)K probed via a direct measurement of the isomer shift. Phys Rev Lett 2014; 113:052502. [PMID: 25126913 DOI: 10.1103/physrevlett.113.052502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Indexed: 06/03/2023]
Abstract
A marked difference in the nuclear charge radius was observed between the I^{π}=3^{+} ground state and the I^{π}=0^{+} isomer of ^{38}K and is qualitatively explained using an intuitive picture of proton-neutron pairing. In a high-precision measurement of the isomer shift using bunched-beam collinear laser spectroscopy at CERN-ISOLDE, a change in the mean-square charge radius of ⟨r_{c}^{2}⟩(^{38}K^{m})-⟨r_{c}^{2}⟩(^{38}K^{g})=0.100(6) fm^{2} was obtained. This is an order of magnitude more accurate than the result of a previous indirect measurement from which it was concluded that both long-lived states in ^{38}K have similar charge radii. Our observation leads to a substantially different understanding since the difference in charge radius is, moreover, opposite in sign to previously reported theoretical predictions. It is demonstrated that the observed isomer shift can be reproduced by large-scale shell-model calculations including proton and neutron excitations across the N,Z=20 shell gaps, confirming the significance of cross-shell correlations in the region of ^{40}Ca.
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Affiliation(s)
- M L Bissell
- KU Leuven, Instituut voor Kern-en Stralingsfysica, B-3001 Leuven, Belgium
| | - J Papuga
- KU Leuven, Instituut voor Kern-en Stralingsfysica, B-3001 Leuven, Belgium
| | - H Naïdja
- Université de Strasbourg, IPHC, 23 rue du Loess 67037 Strasbourg, France CNRS, UMR7178, 67037 Strasbourg, France and GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany and Laboratoire de Physique Mathématique et Subatomique, Constantine 1 University, Constantine 25000, Algeria
| | - K Kreim
- Max-Plank-Institut für Kernphysik, D-69117 Heidelberg, Germany
| | - K Blaum
- Max-Plank-Institut für Kernphysik, D-69117 Heidelberg, Germany
| | - M De Rydt
- KU Leuven, Instituut voor Kern-en Stralingsfysica, B-3001 Leuven, Belgium
| | - R F Garcia Ruiz
- KU Leuven, Instituut voor Kern-en Stralingsfysica, B-3001 Leuven, Belgium
| | - H Heylen
- KU Leuven, Instituut voor Kern-en Stralingsfysica, B-3001 Leuven, Belgium
| | - M Kowalska
- Physics Department, CERN, CH-1211 Geneva 23, Switzerland
| | - R Neugart
- Max-Plank-Institut für Kernphysik, D-69117 Heidelberg, Germany and Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, D-55128 Mainz, Germany
| | - G Neyens
- KU Leuven, Instituut voor Kern-en Stralingsfysica, B-3001 Leuven, Belgium
| | - W Nörtershäuser
- Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, D-55128 Mainz, Germany and Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt, Germany
| | - F Nowacki
- Université de Strasbourg, IPHC, 23 rue du Loess 67037 Strasbourg, France CNRS, UMR7178, 67037 Strasbourg, France
| | - M M Rajabali
- KU Leuven, Instituut voor Kern-en Stralingsfysica, B-3001 Leuven, Belgium
| | - R Sanchez
- GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany and Helmholtz-Institut Mainz, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - K Sieja
- Université de Strasbourg, IPHC, 23 rue du Loess 67037 Strasbourg, France CNRS, UMR7178, 67037 Strasbourg, France
| | - D T Yordanov
- Max-Plank-Institut für Kernphysik, D-69117 Heidelberg, Germany
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15
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Papuga J, Bissell ML, Kreim K, Blaum K, Brown BA, De Rydt M, Garcia Ruiz RF, Heylen H, Kowalska M, Neugart R, Neyens G, Nörtershäuser W, Otsuka T, Rajabali MM, Sánchez R, Utsuno Y, Yordanov DT. Spins and magnetic moments of 49K and 51K: establishing the 1/2+ and 3/2+ level ordering beyond N = 28. Phys Rev Lett 2013; 110:172503. [PMID: 23679713 DOI: 10.1103/physrevlett.110.172503] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2013] [Indexed: 06/02/2023]
Abstract
The ground-state spins and magnetic moments of (49,51)K have been measured using bunched-beam high-resolution collinear laser spectroscopy at ISOLDE CERN. For 49K a ground-state spin I = 1/2 was firmly established. The observed hyperfine structure of 51K requires a spin I > 1/2 and strongly suggests I = 3/2. From its magnetic moment μ(51K) = +0.5129(22)μ(N) a spin-parity I(π) = 3/2+ with a dominant π1d(3/2)(-1) hole configuration was deduced. This establishes for the first time the reinversion of the single-particle levels and illustrates the prominent role of the residual monopole interaction for single-particle levels and shell evolution.
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Affiliation(s)
- J Papuga
- Instituut voor Kern-en Stralingsfysica, KU Leuven, B-3001 Leuven, Belgium.
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16
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Chevrier R, Daugas JM, Gaudefroy L, Ichikawa Y, Ueno H, Hass M, Haas H, Cottenier S, Aoi N, Asahi K, Balabanski DL, Fukuda N, Furukawa T, Georgiev G, Hayashi H, Iijima H, Inabe N, Inoue T, Ishihara M, Ishii Y, Kameda D, Kubo T, Nanao T, Neyens G, Ohnishi T, Rajabali MM, Suzuki K, Takeda H, Tsuchiya M, Vermeulen N, Watanabe H, Yoshimi A. Is the 7/2(1)- isomer state of 43S spherical? Phys Rev Lett 2012; 108:162501. [PMID: 22680712 DOI: 10.1103/physrevlett.108.162501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2011] [Indexed: 06/01/2023]
Abstract
We report on the spectroscopic quadrupole moment measurement of the 7/2(1)(-) isomeric state in (16)(43)S(27) [E*=320.5(5) keV, T(1/2)=415(3) ns], using the time dependent perturbed angular distribution technique at the RIKEN RIBF facility. Our value, |Q(s)|=23(3) efm(2), is larger than that expected for a single-particle state. Shell model calculations using the modern SDPF-U interaction for this mass region reproduce remarkably well the measured |Q(s)|, and show that non-negligible correlations drive the isomeric state away from a purely spherical shape.
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17
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Petri M, Fallon P, Macchiavelli AO, Paschalis S, Starosta K, Baugher T, Bazin D, Cartegni L, Clark RM, Crawford HL, Cromaz M, Dewald A, Gade A, Grinyer GF, Gros S, Hackstein M, Jeppesen HB, Lee IY, McDaniel S, Miller D, Rajabali MM, Ratkiewicz A, Rother W, Voss P, Walsh KA, Weisshaar D, Wiedeking M, Brown BA. Lifetime measurement of the 2(1)+ state in 20C. Phys Rev Lett 2011; 107:102501. [PMID: 21981497 DOI: 10.1103/physrevlett.107.102501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2011] [Indexed: 05/31/2023]
Abstract
Establishing how and when large N/Z values require modified or new theoretical tools is a major quest in nuclear physics. Here we report the first measurement of the lifetime of the 2(1)+ state in the near-dripline nucleus 20C. The deduced value of τ(2(1)+)=9.8±2.8(stat)(-1.1)(+0.5)(syst) ps gives a reduced transition probability of B(E2; 2(1)+→0(g.s.)+)=7.5(-1.7)(+3.0)(stat)(-0.4)(+1.0)(syst) e2 fm4 in good agreement with a shell model calculation using isospin-dependent effective charges.
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Affiliation(s)
- M Petri
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
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18
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Darby IG, Grzywacz RK, Batchelder JC, Bingham CR, Cartegni L, Gross CJ, Hjorth-Jensen M, Joss DT, Liddick SN, Nazarewicz W, Padgett S, Page RD, Papenbrock T, Rajabali MM, Rotureau J, Rykaczewski KP. Orbital dependent nucleonic pairing in the lightest known isotopes of tin. Phys Rev Lett 2010; 105:162502. [PMID: 21230967 DOI: 10.1103/physrevlett.105.162502] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2010] [Indexed: 05/30/2023]
Abstract
By studying the (109)Xe→(105)Te→(101)Sn superallowed α-decay chain, we observe low-lying states in (101)Sn, the one-neutron system outside doubly magic (100)Sn. We find that the spins of the ground state (J=7/2) and first excited state (J=5/2) in (101)Sn are reversed with respect to the traditional level ordering postulated for (103)Sn and the heavier tin isotopes. Through simple arguments and state-of-the-art shell-model calculations we explain this unexpected switch in terms of a transition from the single-particle regime to the collective mode in which orbital-dependent pairing correlations dominate.
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Affiliation(s)
- I G Darby
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
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19
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Winger JA, Ilyushkin SV, Rykaczewski KP, Gross CJ, Batchelder JC, Goodin C, Grzywacz R, Hamilton JH, Korgul A, Królas W, Liddick SN, Mazzocchi C, Padgett S, Piechaczek A, Rajabali MM, Shapira D, Zganjar EF, Borzov IN. Large beta-delayed neutron emission probabilities in the 78Ni region. Phys Rev Lett 2009; 102:142502. [PMID: 19392431 DOI: 10.1103/physrevlett.102.142502] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2009] [Indexed: 05/27/2023]
Abstract
The beta-delayed neutron branching ratios (P{betan}) for nuclei near doubly magic 78Ni have been directly measured using a new method combining high-resolution mass separation, reacceleration, and digital beta-gamma spectroscopy of 238U fission products. The P{betan} values for the very neutron-rich isotopes ;{76-78}Cu and 83Ga were found to be much higher than previously reported and predicted. Revised calculations of the betan process, accounting for new mass measurements and an inversion of the pi2p{3/2} and pi1f{5/2} orbitals, are in better agreement with these new experimental results.
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Affiliation(s)
- J A Winger
- Department of Physics and Astronomy, Mississippi State University, Mississippi State, Mississippi 39762, USA.
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