1
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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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2
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Lotay G, Gillespie SA, Williams M, Rauscher T, Alcorta M, Amthor AM, Andreoiu CA, Baal D, Ball GC, Bhattacharjee SS, Behnamian H, Bildstein V, Burbadge C, Catford WN, Doherty DT, Esker NE, Garcia FH, Garnsworthy AB, Hackman G, Hallam S, Hudson KA, Jazrawi S, Kasanda E, Kennington ARL, Kim YH, Lennarz A, Lubna RS, Natzke CR, Nishimura N, Olaizola B, Paxman C, Psaltis A, Svensson CE, Williams J, Wallis B, Yates D, Walter D, Davids B. First Direct Measurement of an Astrophysical p-Process Reaction Cross Section Using a Radioactive Ion Beam. Phys Rev Lett 2021; 127:112701. [PMID: 34558922 DOI: 10.1103/physrevlett.127.112701] [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: 05/14/2021] [Revised: 07/19/2021] [Accepted: 08/11/2021] [Indexed: 06/13/2023]
Abstract
We have performed the first direct measurement of the ^{83}Rb(p,γ) radiative capture reaction cross section in inverse kinematics using a radioactive beam of ^{83}Rb at incident energies of 2.4 and 2.7A MeV. The measured cross section at an effective relative kinetic energy of E_{cm}=2.393 MeV, which lies within the relevant energy window for core collapse supernovae, is smaller than the prediction of statistical model calculations. This leads to the abundance of ^{84}Sr produced in the astrophysical p process being higher than previously calculated. Moreover, the discrepancy of the present data with theoretical predictions indicates that further experimental investigation of p-process reactions involving unstable projectiles is clearly warranted.
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Affiliation(s)
- G Lotay
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - S A Gillespie
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - M Williams
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
| | - T Rauscher
- Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
- Centre for Astrophysics Research, University of Hertfordshire, Hatfield AL10 9AB, United Kingdom
| | - M Alcorta
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - A M Amthor
- Department of Physics and Astronomy, Bucknell University, Lewisburg, Pennsylvania 17837, USA
| | - C A Andreoiu
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - D Baal
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - G C Ball
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - S S Bhattacharjee
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - H Behnamian
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - V Bildstein
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - C Burbadge
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - W N Catford
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - D T Doherty
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - N E Esker
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - F H Garcia
- 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
| | - G Hackman
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - S Hallam
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - K A Hudson
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - S Jazrawi
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - E Kasanda
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - A R L Kennington
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - Y H Kim
- Department of Nuclear Engineering, Hanyang University, Seoul 04763, Republic of Korea
| | - A Lennarz
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - R S Lubna
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - C R Natzke
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA
| | - N Nishimura
- Astrophysical Big Bang Laboratory, CPR, RIKEN, Wako, Saitama 351-0198, Japan
| | - B Olaizola
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - C Paxman
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - A Psaltis
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4L8, Canada
| | - C E Svensson
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - J Williams
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - B Wallis
- Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
| | - D Yates
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics and Astronomy, University of British Columbia, Vancouver BC V6T 1Z4, Canada
| | - D Walter
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - B Davids
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics, Simon Fraser University, Burnaby, British Columbia V5A 1S6, 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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Ayyad Y, Olaizola B, Mittig W, Potel G, Zelevinsky V, Horoi M, Beceiro-Novo S, Alcorta M, Andreoiu C, Ahn T, Anholm M, Atar L, Babu A, Bazin D, Bernier N, Bhattacharjee SS, Bowry M, Caballero-Folch R, Cortesi M, Dalitz C, Dunling E, Garnsworthy AB, Holl M, Kootte B, Leach KG, Randhawa JS, Saito Y, Santamaria C, Šiurytė P, Svensson CE, Umashankar R, Watwood N, Yates D. Erratum: Direct Observation of Proton Emission in ^{11}Be [Phys. Rev. Lett. 123, 082501 (2019)]. Phys Rev Lett 2020; 124:129902. [PMID: 32281850 DOI: 10.1103/physrevlett.124.129902] [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: 03/11/2020] [Accepted: 03/12/2020] [Indexed: 06/11/2023]
Abstract
This corrects the article DOI: 10.1103/PhysRevLett.123.082501.
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5
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Garrett PE, Rodríguez TR, Varela AD, Green KL, Bangay J, Finlay A, Austin RAE, Ball GC, Bandyopadhyay DS, Bildstein V, Colosimo S, Cross DS, Demand GA, Finlay P, Garnsworthy AB, Grinyer GF, Hackman G, Jigmeddorj B, Jolie J, Kulp WD, Leach KG, Morton AC, Orce JN, Pearson CJ, Phillips AA, Radich AJ, Rand ET, Schumaker MA, Svensson CE, Sumithrarachchi C, Triambak S, Warr N, Wong J, Wood JL, Yates SW. Multiple Shape Coexistence in ^{110,112}Cd. Phys Rev Lett 2019; 123:142502. [PMID: 31702191 DOI: 10.1103/physrevlett.123.142502] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 06/29/2019] [Indexed: 06/10/2023]
Abstract
From detailed spectroscopy of ^{110}Cd and ^{112}Cd following the β^{+}/electron-capture decay of ^{110,112}In and the β^{-} decay of ^{112}Ag, very weak decay branches from nonyrast states are observed. The transition rates determined from the measured branching ratios and level lifetimes obtained with the Doppler-shift attenuation method following inelastic neutron scattering reveal collective enhancements that are suggestive of a series of rotational bands. In ^{110}Cd, a γ band built on the shape-coexisting intruder configuration is suggested. For ^{112}Cd, the 2^{+} and 3^{+} intruder γ-band members are suggested, the 0_{3}^{+} band is extended to spin 4^{+}, and the 0_{4}^{+} band is identified. The results are interpreted using beyond-mean-field calculations employing the symmetry conserving configuration mixing method with the Gogny D1S energy density functional and with the suggestion that the Cd isotopes exhibit multiple shape coexistence.
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Affiliation(s)
- P E Garrett
- Department of Physics, University of Guelph, Guelph, Ontario N1G2W1, Canada
- Department of Physics and Astronomy, University of the Western Cape, P/B X17, Bellville ZA-7535, South Africa
| | - T R Rodríguez
- Departamento de Física Teórica and CIAFF, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - A Diaz Varela
- Department of Physics, University of Guelph, Guelph, Ontario N1G2W1, Canada
| | - K L Green
- Department of Physics, University of Guelph, Guelph, Ontario N1G2W1, Canada
| | - J Bangay
- Department of Physics, University of Guelph, Guelph, Ontario N1G2W1, Canada
| | - A Finlay
- Department of Physics, University of Guelph, Guelph, Ontario N1G2W1, Canada
| | - R A E Austin
- Department of Physics and Astronomy, St. Mary's University, Halifax, Nova Scotia B3H3C3, Canada
| | - G C Ball
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T2A3, Canada
| | - D S Bandyopadhyay
- Department of Physics, University of Guelph, Guelph, Ontario N1G2W1, Canada
| | - V Bildstein
- Department of Physics, University of Guelph, Guelph, Ontario N1G2W1, Canada
| | - S Colosimo
- Department of Physics and Astronomy, St. Mary's University, Halifax, Nova Scotia B3H3C3, Canada
| | - D S Cross
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A1S6, Canada
| | - G A Demand
- Department of Physics, University of Guelph, Guelph, Ontario N1G2W1, Canada
| | - P Finlay
- Department of Physics, University of Guelph, Guelph, Ontario N1G2W1, Canada
| | - A B Garnsworthy
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T2A3, Canada
| | - G F Grinyer
- Department of Physics, University of Regina, Regina, Saskatchewan S4S0A2, Canada
| | - G Hackman
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T2A3, Canada
| | - B Jigmeddorj
- Department of Physics, University of Guelph, Guelph, Ontario N1G2W1, Canada
| | - J Jolie
- Institut für Kernphysik, Universität zu Köln, Zülpicherstrasse 77, D-50937 Köln, Germany
| | - W D Kulp
- Defense Threat Reduction Agency, 8725 John J Kingman Road, Fort Belvoir, Virginia 22060-6217, USA
| | - K G Leach
- Department of Physics, University of Guelph, Guelph, Ontario N1G2W1, Canada
| | - A C Morton
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T2A3, Canada
| | - J N Orce
- Department of Physics and Astronomy, University of the Western Cape, P/B X17, Bellville ZA-7535, South Africa
| | - C J Pearson
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T2A3, Canada
| | - A A Phillips
- Department of Physics, University of Guelph, Guelph, Ontario N1G2W1, Canada
| | - A J Radich
- Department of Physics, University of Guelph, Guelph, Ontario N1G2W1, Canada
| | - E T Rand
- Department of Physics, University of Guelph, Guelph, Ontario N1G2W1, Canada
| | - M A Schumaker
- Department of Physics, University of Guelph, Guelph, Ontario N1G2W1, Canada
| | - C E Svensson
- Department of Physics, University of Guelph, Guelph, Ontario N1G2W1, Canada
| | - C Sumithrarachchi
- Department of Physics, University of Guelph, Guelph, Ontario N1G2W1, Canada
| | - S Triambak
- Department of Physics and Astronomy, University of the Western Cape, P/B X17, Bellville ZA-7535, South Africa
| | - N Warr
- Institut für Kernphysik, Universität zu Köln, Zülpicherstrasse 77, D-50937 Köln, Germany
| | - J Wong
- Department of Physics, University of Guelph, Guelph, Ontario N1G2W1, Canada
| | - J L Wood
- Department of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
| | - S W Yates
- Departments of Chemistry and Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506-0055, USA
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6
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Ayyad Y, Olaizola B, Mittig W, Potel G, Zelevinsky V, Horoi M, Beceiro-Novo S, Alcorta M, Andreoiu C, Ahn T, Anholm M, Atar L, Babu A, Bazin D, Bernier N, Bhattacharjee SS, Bowry M, Caballero-Folch R, Cortesi M, Dalitz C, Dunling E, Garnsworthy AB, Holl M, Kootte B, Leach KG, Randhawa JS, Saito Y, Santamaria C, Šiurytė P, Svensson CE, Umashankar R, Watwood N, Yates D. Direct Observation of Proton Emission in ^{11}Be. Phys Rev Lett 2019; 123:082501. [PMID: 31491233 DOI: 10.1103/physrevlett.123.082501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Indexed: 06/10/2023]
Abstract
The elusive β^{-}p^{+} decay was observed in ^{11}Be by directly measuring the emitted protons and their energy distribution for the first time with the prototype Active Target Time Projection Chamber in an experiment performed at ISAC-TRIUMF. The measured β^{-}p^{+} branching ratio is orders of magnitude larger than any previous theoretical model predicted. This can be explained by the presence of a narrow resonance in ^{11}B above the proton separation energy.
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Affiliation(s)
- Y Ayyad
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - B Olaizola
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - W Mittig
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - G Potel
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
| | - V Zelevinsky
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Horoi
- Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA
| | - S Beceiro-Novo
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - M Alcorta
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - C Andreoiu
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - T Ahn
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - M Anholm
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - L Atar
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - A Babu
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - D Bazin
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - 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 Caballero-Folch
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - M Cortesi
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - C Dalitz
- Niederrhein University of Applied Sciences, Institute for Pattern Recognition Reinarzstrasse 49, 47805 Krefeld, Germany
| | - E Dunling
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
| | - A B Garnsworthy
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - M Holl
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- Department of Astronomy and Physics, Saint Marys University, Halifax, Nova Scotia B3H 3C3, Canada
| | - B Kootte
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - K G Leach
- Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA
| | - J S Randhawa
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - Y Saito
- 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
| | - C Santamaria
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - P Šiurytė
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
- Department of Physics, University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom
| | - 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
| | - N Watwood
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - D Yates
- 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
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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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Evitts LJ, Garnsworthy AB, Kibédi T, Moukaddam M, Alshahrani B, Eriksen TK, Holt JD, Hota SS, Lane GJ, Lee BQ, McCormick BP, Palalani N, Reed MW, Stroberg SR, Stuchbery AE. Electric Monopole Transition Strengths in62Ni. EPJ Web Conf 2016. [DOI: 10.1051/epjconf/201612302004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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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10
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Smallcombe J, Moukaddam M, Evitts LJ, Garnsworthy AB, Hallam S, Andreoiu C, Ball GC, Bolton C, Caballero-Folch R, Constable M, Cross DS, Garrett PE, Hackman G, Henderson J, Henderson R, Ketelhut S, Kruecken R, Kurchaninov L, Park J, Pore JL, Rand ET, Ruotsalainen P, Smith JK, Svensson CE, Williams M. SPectrometer for Internal Conversion Electrons (SPICE) at TRIUMF-ISAC. EPJ Web Conf 2016. [DOI: 10.1051/epjconf/201612304005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [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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11
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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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12
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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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13
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Morales AI, Benlliure J, Kurtukián-Nieto T, Schmidt KH, Verma S, Regan PH, Podolyák Z, Górska M, Pietri S, Kumar R, Casarejos E, Al-Dahan N, Algora A, Alkhomashi N, Álvarez-Pol H, Benzoni G, Blazhev A, Boutachkov P, Bruce AM, Cáceres LS, Cullen IJ, Denis Bacelar AM, Doornenbal P, Estévez-Aguado ME, Farrelly G, Fujita Y, Garnsworthy AB, Gelletly W, Gerl J, Grebosz J, Hoischen R, Kojouharov I, Kurz N, Lalkovski S, Liu Z, Mihai C, Molina F, Mücher D, Rubio B, Shaffner H, Steer SJ, Tamii A, Tashenov S, Valiente-Dobón JJ, Walker PM, Wollersheim HJ, Woods PJ. Half-life systematics across the N=126 shell closure: role of first-forbidden transitions in the β decay of heavy neutron-rich nuclei. Phys Rev Lett 2014; 113:022702. [PMID: 25062171 DOI: 10.1103/physrevlett.113.022702] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2014] [Indexed: 06/03/2023]
Abstract
This Letter reports on a systematic study of β-decay half-lives of neutron-rich nuclei around doubly magic (208)Pb. The lifetimes of the 126-neutron shell isotone (204)Pt and the neighboring (200-202)Ir, (203)Pt, (204)Au are presented together with other 19 half-lives measured during the "stopped beam" campaign of the rare isotope investigations at GSI collaboration. The results constrain the main nuclear theories used in calculations of r-process nucleosynthesis. Predictions based on a statistical macroscopic description of the first-forbidden β strength reveal significant deviations for most of the nuclei with N<126. In contrast, theories including a fully microscopic treatment of allowed and first-forbidden transitions reproduce more satisfactorily the trend in the measured half-lives for the nuclei in this region, where the r-process pathway passes through during β decay back to stability.
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Affiliation(s)
- A I Morales
- Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain
| | - J Benlliure
- Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain
| | - T Kurtukián-Nieto
- Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain
| | - K-H Schmidt
- GSI, Planckstrasse 1, D-64291 Darmstadt, Germany
| | - S Verma
- Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain
| | - P H Regan
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom and National Physical Laboratory, Teddington, Middlesex TW11 0LW, United Kingdom
| | - Z Podolyák
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - M Górska
- GSI, Planckstrasse 1, D-64291 Darmstadt, Germany
| | - S Pietri
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - R Kumar
- GSI, Planckstrasse 1, D-64291 Darmstadt, Germany and IFAC, New Delhi, India
| | - E Casarejos
- Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain
| | - N Al-Dahan
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - A Algora
- IFIC, CSIC-Universidad de Valencia, E-46071 Valencia, Spain and Institute of Nuclear Research of the Hungarian Academy of Sciences, Debrecen H-4001, Hungary
| | - N Alkhomashi
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - H Álvarez-Pol
- Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain
| | - G Benzoni
- INFN, Università degli Studi di Milano, I-20133 Milano, Italy
| | - A Blazhev
- IKP, University of Cologne, D-50937 Cologne, Germany
| | - P Boutachkov
- GSI, Planckstrasse 1, D-64291 Darmstadt, Germany
| | - A M Bruce
- School of Computing, Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, United Kingdom
| | - L S Cáceres
- GSI, Planckstrasse 1, D-64291 Darmstadt, Germany
| | - I J Cullen
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - A M Denis Bacelar
- School of Computing, Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, United Kingdom
| | - P Doornenbal
- GSI, Planckstrasse 1, D-64291 Darmstadt, Germany
| | - M E Estévez-Aguado
- Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain
| | - G Farrelly
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - Y Fujita
- Department of Physics, Osaka University, 560-0043 Osaka, Japan
| | - A B Garnsworthy
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - W Gelletly
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - J Gerl
- GSI, Planckstrasse 1, D-64291 Darmstadt, Germany
| | - J Grebosz
- The Henryk Niewodniczànski Institute of Nuclear Physics, PL-31-342 Kraków, Poland
| | - R Hoischen
- Department of Physics, Lund University, S-22100 Lund, Sweden
| | - I Kojouharov
- GSI, Planckstrasse 1, D-64291 Darmstadt, Germany
| | - N Kurz
- GSI, Planckstrasse 1, D-64291 Darmstadt, Germany
| | - S Lalkovski
- School of Computing, Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, United Kingdom
| | - Z Liu
- School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
| | - C Mihai
- Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH), RO-077125 Bucharest-Magurele, Romania
| | - F Molina
- IFIC, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
| | - D Mücher
- IKP, University of Cologne, D-50937 Cologne, Germany
| | - B Rubio
- IFIC, CSIC-Universidad de Valencia, E-46071 Valencia, Spain
| | - H Shaffner
- GSI, Planckstrasse 1, D-64291 Darmstadt, Germany
| | - S J Steer
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | - A Tamii
- Research Center for Nuclear Physics (RCNP), Osaka University, 567-0047 Osaka, Japan
| | - S Tashenov
- GSI, Planckstrasse 1, D-64291 Darmstadt, Germany
| | | | - P M Walker
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
| | | | - P J Woods
- School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
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14
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Laffoley AT, Svensson CE, Andreoiu C, Austin RAE, Ball GC, Blank B, Bouzomita H, Cross DS, Diaz Varela A, Dunlop R, Finlay P, Garnsworthy AB, Garrett PE, Giovinazzo J, Grinyer GF, Hackman G, Hadinia B, Jamieson DS, Ketelhut S, Leach KG, Leslie JR, Tardiff ER, Thomas JC, Unsworth C. High-Precision Half-life Measurements for the Superallowed β+Emitter 14O. EPJ Web of Conferences 2014. [DOI: 10.1051/epjconf/20146605012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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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15
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Laffoley AT, Dunlop R, Finlay P, Grinyer GF, Andreoiu C, Austin RAE, Ball GC, Bandyopadhyay D, Blank B, Bouzomita H, Chagnon-Lessard S, Chester A, Cross DS, Demand G, Diaz Varela A, Djongolov M, Ettenauer S, Garnsworthy AB, Garrett PE, Giovinazzo J, Glister J, Green KL, Hackman G, Hadinia B, Jamieson DS, Ketelhut S, Leach KG, Leslie JR, Pearson CJ, Phillips AA, Rand ET, Starosta K, Sumithrarachchi CS, Svensson CE, Tardiff ER, Thomas JC, Towner IS, Triambak S, Unsworth C, Williams SJ, Wong J, Yates SW, Zganjar EF. High-precision half-life and branching-ratio measurements for superallowed Fermi β+emitters at TRIUMF – ISAC. EPJ Web of Conferences 2014. [DOI: 10.1051/epjconf/20146605013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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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16
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Tardiff ER, Rand ET, Ball GC, Chupp TE, Garnsworthy AB, Garrett P, Hayden ME, Kierans CA, Lorenzon W, Pearson MR, Schaub C, Svensson CE. The radon EDM apparatus. ACTA ACUST UNITED AC 2013. [DOI: 10.1007/s10751-013-0898-2] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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17
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Chakraborty A, Peters EE, Crider BP, Andreoiu C, Bender PC, Cross DS, Demand GA, Garnsworthy AB, Garrett PE, Hackman G, Hadinia B, Ketelhut S, Kumar A, Leach KG, McEllistrem MT, Pore J, Prados-Estévez FM, Rand ET, Singh B, Tardiff ER, Wang ZM, Wood JL, Yates SW. Collective structure in 94Zr and subshell effects in shape coexistence. Phys Rev Lett 2013; 110:022504. [PMID: 23383898 DOI: 10.1103/physrevlett.110.022504] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2012] [Revised: 10/22/2012] [Indexed: 06/01/2023]
Abstract
Based on results from a measurement of weak decay branches observed following the β- decay of 94Y and on lifetime data from a study of 94Zr by inelastic neutron scattering, collective structure is deduced in the closed-subshell nucleus 94Zr. These results establish shape coexistence in 94Zr. The role of subshells for nuclear collectivity is suggested to be important.
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Affiliation(s)
- A Chakraborty
- Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506-0055, USA
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18
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Triambak S, Finlay P, Sumithrarachchi CS, Hackman G, Ball GC, Garrett PE, Svensson CE, Cross DS, Garnsworthy AB, Kshetri R, Orce JN, Pearson MR, Tardiff ER, Al-Falou H, Austin RAE, Churchman R, Djongolov MK, D'Entremont R, Kierans C, Milovanovic L, O'Hagan S, Reeve S, Sjue SKL, Williams SJ. High-precision measurement of the 19Ne half-life and implications for right-handed weak currents. Phys Rev Lett 2012; 109:042301. [PMID: 23006079 DOI: 10.1103/physrevlett.109.042301] [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: 04/27/2012] [Indexed: 06/01/2023]
Abstract
We report a precise determination of the (19)Ne half-life to be T(1/2)=17.262±0.007 s. This result disagrees with the most recent precision measurements and is important for placing bounds on predicted right-handed interactions that are absent in the current standard model. We are able to identify and disentangle two competing systematic effects that influence the accuracy of such measurements. Our findings prompt a reassessment of results from previous high-precision lifetime measurements that used similar equipment and methods.
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Affiliation(s)
- S Triambak
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
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