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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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Fijałkowska A, Karny M, Rykaczewski KP, Rasco BC, Grzywacz R, Gross CJ, Wolińska-Cichocka M, Goetz KC, Stracener DW, Bielewski W, Goans R, Hamilton JH, Johnson JW, Jost C, Madurga M, Miernik K, Miller D, Padgett SW, Paulauskas SV, Ramayya AV, Zganjar EF. Impact of Modular Total Absorption Spectrometer measurements of β decay of fission products on the decay heat and reactor ν[over ¯]_{e} flux calculation. Phys Rev Lett 2017; 119:052503. [PMID: 28949741 DOI: 10.1103/physrevlett.119.052503] [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: 04/17/2017] [Indexed: 06/07/2023]
Abstract
We report the results of a β-decay study of fission products ^{86}Br, ^{89}Kr, ^{89}Rb, ^{90gs}Rb, ^{90m}Rb, ^{90}Kr, ^{92}Rb, ^{139}Xe, and ^{142}Cs performed with the Modular Total Absorption Spectrometer (MTAS) and on-line mass-separated ion beams. These radioactivities were assessed by the Nuclear Energy Agency as having high priority for decay heat analysis during a nuclear fuel cycle. We observe a substantial increase in β feeding to high excited states in all daughter isotopes in comparison to earlier data. This increases the average γ-ray energy emitted by the decay of fission fragments during the first 10 000 s after fission of ^{235}U and ^{239}Pu by approximately 2% and 1%, respectively, improving agreement between results of calculations and direct observations. New MTAS results reduce the reference reactor ν[over ¯]_{e} flux used to analyze reactor ν[over ¯]_{e} interaction with detector matter. The reduction determined by the ab initio method for the four nuclear fuel components, ^{235}U, ^{238}U, ^{239}Pu, and ^{241}Pu, amounts to 0.976, 0.986, 0.983, and 0.984, respectively.
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Affiliation(s)
- A Fijałkowska
- Faculty of Physics, University of Warsaw, PL-02-093 Warsaw, Poland
- Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - M Karny
- Faculty of Physics, University of Warsaw, PL-02-093 Warsaw, Poland
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- JINPA, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - K P Rykaczewski
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - B C Rasco
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- JINPA, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - R Grzywacz
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- JINPA, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - C J Gross
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M Wolińska-Cichocka
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- JINPA, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Heavy Ion Laboratory, University of Warsaw, PL-02-093 Warsaw, Poland
| | - 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
| | - D W Stracener
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - W Bielewski
- Faculty of Physics, University of Warsaw, PL-02-093 Warsaw, Poland
| | - R Goans
- Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831, USA
| | - J H Hamilton
- Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA
| | - J W Johnson
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - C Jost
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - M Madurga
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - K Miernik
- Faculty of Physics, University of Warsaw, PL-02-093 Warsaw, Poland
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - D Miller
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - S W Padgett
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - S V Paulauskas
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA
| | - A V Ramayya
- Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA
| | - E F Zganjar
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
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3
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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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Szerypo J, Grzywacz R, Janas Z, Karny M, Pfützner M, Plochocki A, Rykaczewski K, Żylicz J, Huyse M, Reusen G, Schwarzenberg J, Van Duppen P, Woehr A, Keller H, Kirchner R, Klepper O, Piechaczek A, Roeckl E, Schmidt K, Batist L, Bykov A, Wittman V, Brown BA. Decay properties of ground-state and isomer of 103In. ACTA ACUST UNITED AC 2014. [DOI: 10.1007/s002180050376] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Konstantinopoulos T, Astier A, Petrache C, Abudra A, Bontemps R, Deloncle I, Kaim S, Leguillon R, Petrache C, Porquet MG, Zerrouki T, Grente L, Salsac MD, Zielinska M, France GD, Janas Z, Karny M, Korgul A, Ramdhane M, Gey G, Simpson G, Vancraeyenest A, Blanc A, Jentschel M, Köster U, Mutti P, Soldner T, Urban W, Duchêne G, Lozeva R, Ibrahim F, Gargano A, Covello A, Mengoni D, Ur C, Sferrazza M, Melon B. γ-ray spectroscopy of fission fragments from the cold-neutron 235U induced fission with EXILL. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20136201006] [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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Madurga M, Surman R, Borzov IN, Grzywacz R, Rykaczewski KP, Gross CJ, Miller D, Stracener DW, Batchelder JC, Brewer NT, Cartegni L, Hamilton JH, Hwang JK, Liu SH, Ilyushkin SV, Jost C, Karny M, Korgul A, Królas W, Kuźniak A, Mazzocchi C, Mendez AJ, Miernik K, Padgett SW, Paulauskas SV, Ramayya AV, Winger JA, Wolińska-Cichocka M, Zganjar EF. New half-lives of r-process Zn and Ga isotopes measured with electromagnetic separation. Phys Rev Lett 2012; 109:112501. [PMID: 23005622 DOI: 10.1103/physrevlett.109.112501] [Citation(s) in RCA: 3] [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: 01/18/2012] [Revised: 05/10/2012] [Indexed: 06/01/2023]
Abstract
The β decays of neutron-rich nuclei near the doubly magic (78)Ni were studied at the Holifield Radioactive Ion Beam Facility using an electromagnetic isobar separator. The half-lives of (82)Zn (228±10 ms), (83)Zn (117±20 ms), and (85)Ga (93±7 ms) were determined for the first time. These half-lives were found to be very different from the predictions of the global model used in astrophysical simulations. A new calculation was developed using the density functional model, which properly reproduced the new experimental values. The robustness of the new model in the (78)Ni region allowed us to extrapolate data for more neutron-rich isotopes. The revised analysis of the rapid neutron capture process in low entropy environments with our new set of measured and calculated half-lives shows a significant redistribution of predicted isobaric abundances strengthening the yield of A>140 nuclei.
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Affiliation(s)
- M Madurga
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
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7
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Miernik K, Dominik W, Janas Z, Pfützner M, Grigorenko L, Bingham CR, Czyrkowski H, Cwiok M, Darby IG, Dabrowski R, Ginter T, Grzywacz R, Karny M, Korgul A, Kuśmierz W, Liddick SN, Rajabali M, Rykaczewski K, Stolz A. Two-proton correlations in the decay of 45Fe. Phys Rev Lett 2007; 99:192501. [PMID: 18233071 DOI: 10.1103/physrevlett.99.192501] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2007] [Indexed: 05/25/2023]
Abstract
The decay of extremely neutron-deficient 45Fe has been studied in detail by means of a novel type of a gaseous detector employing digital imaging to record tracks of charged particles. The two-proton radioactivity channel was clearly identified. For the first time, the angular and energy correlations between two protons emitted from the nuclear ground state were determined, indicating the genuine three-body character of this decay. The half-life of 45Fe was found to be 2.6+/-0.2 ms and the observed 2p decay branching ratio is 70+/-4%.
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Affiliation(s)
- K Miernik
- Institute of Experimental Physics, Warsaw University, 00-681, Warsaw, Poland
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Karny M, Grzywacz RK, Batchelder JC, Bingham CR, Gross CJ, Hagino K, Hamilton JH, Janas Z, Kulp WD, McConnell JW, Momayezi M, Piechaczek A, Rykaczewski KP, Semmes PA, Tantawy MN, Winger JA, Yu CH, Zganjar EF. Fine structure in proton emission from 145Tm discovered with digital signal processing. Phys Rev Lett 2003; 90:012502. [PMID: 12570604 DOI: 10.1103/physrevlett.90.012502] [Citation(s) in RCA: 3] [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: 07/29/2002] [Indexed: 05/24/2023]
Abstract
Fine structure in proton emission from the 3.1(3) mus activity of 145Tm was discovered by using a novel technique of digital processing of overlapping recoil implantation and decay signals. Proton transitions to the ground state of 144Er and to its first excited 2(+) state at 0.33(1) MeV with a branching ratio I(p)(2(+))=9.6+/-1.5% were observed. The structure of the 145Tm wave function and the emission process were analyzed by using particle-core vibration coupling models.
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Affiliation(s)
- M Karny
- IFD, Warsaw University, Pl-00681 Warsaw, Hoza 69, Poland
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Blank B, Czajkowski S, Davi F, Dufour JP, Fleury A, Marchand C, Pravikoff MS, Benlliure J, Boué F, Collatz R, Heinz A, Hellström M, Hu Z, Roeckl E, Shibata M, Sümmerer K, Janas Z, Karny M, Pfützner M, Lewitowicz M. First Observation of the Tz=-7/2 Nuclei 45Fe and 49Ni. Phys Rev Lett 1996; 77:2893-2896. [PMID: 10062079 DOI: 10.1103/physrevlett.77.2893] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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