β-delayed neutron emissions from N>50 gallium isotopes

作     者：R. Yokoyama R. Grzywacz B. C. Rasco N. Brewer K. P. Rykaczewski I. Dillmann J. L. Tain S. Nishimura D. S. Ahn A. Algora J. M. Allmond J. Agramunt H. Baba S. Bae C. G. Bruno R. Caballero-Folch F. Calvino P. J. Coleman-Smith G. Cortes T. Davinson C. Domingo-Pardo A. Estrade N. Fukuda S. Go C. J. Griffin J. Ha O. Hall L. J. Harkness-Brennan J. Heideman T. Isobe D. Kahl M. Karny T. Kawano L. H. Khiem T. T. King G. G. Kiss A. Korgul S. Kubono M. Labiche I. Lazarus J. Liang J. Liu G. Lorusso M. Madurga K. Matsui K. Miernik F. Montes A. I. Morales P. Morrall N. Nepal R. D. Page V. H. Phong M. Piersa-Siłkowska M. Prydderch V. F. E. Pucknell M. M. Rajabali B. Rubio Y. Saito H. Sakurai Y. Shimizu J. Simpson M. Singh D. W. Stracener T. Sumikama H. Suzuki H. Takeda A. Tarifeño-Saldivia S. L. Thomas A. Tolosa-Delgado M. Wolińska-Cichocka P. J. Woods X. X. Xu 

作者机构：Department of Physics and Astronomy University of Tennessee Knoxville Tennessee 37996 USA Center for Nuclear Study the University of Tokyo 2-1 Hirosawa Wako Saitama 351-0198 Japan Physics Division Oak Ridge National Laboratory Oak Ridge Tennessee 37830 USA TRIUMF Vancouver British Columbia V6T 2A3 Canada Instituto de Fisica Corpuscular (CSIC-Universitat de Valencia) E-46071 Valencia Spain RIKEN Nishina Center 2-1 Hirosawa Wako Saitama 351-0198 Japan MTA Atomki Bem ter 18/c Debrecen H4032 Hungary Department of Physics and Astronomy Seoul National University 1 Gwanak-ro Gwanak-gu Seoul 08826 Republic of Korea School of Physics and Astronomy University of Edinburgh EH9 3FD Edinburgh United Kingdom Universitat Politècnica de Catalunya (UPC) E-08028 Barcelona Spain STFC Daresbury Laboratory Daresbury Warrington WA4 4AD United Kingdom Department of Physics and Science of Advanced Materials Program Central Michigan University Mount Pleasant Michigan 48859 USA Department of Physics University of Liverpool Liverpool L69 7ZE United Kingdom Faculty of Physics University of WarsawPL-02-093 Warsaw Poland Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Institute of Physics Vietnam Academy of Science and Technology 10 Dao Tan Ba Dinh Hanoi Vietnam Department of Physics and Astronomy McMaster University Hamilton Ontario L8S 4M1 Canada Department of Physics University of Hong Kong Pokfulam Road Hong Kong National Physical Laboratory (NPL) Teddington Middlesex TW11 0LW United Kingdom Department of Physics University of Surrey Guildford GU2 7XH United Kingdom Department of Physics University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan National Superconducting Cyclotron Laboratory Michigan State University East Lansing Michigan 48824 USA University of Science Vietnam National University Hanoi 120062 Vietnam STFC Rutherford Appleton Laboratory Harwell Campus Didcot OX11 0QX United Kingdom Department of Physics Tennessee Technological University Cookeville Tennessee 38505 USA Heavy Ion Laboratory University of Warsaw Warsaw PL-02-093 Poland 

出 版 物：《Physical Review C》 (物理学评论C辑：核物理学)

年 卷 期：2023年第108卷第6期

页      面：064307-064307页

核心收录：

学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

基　　金：National Nuclear Security Administration, NNSA Science and Technology Facilities Council, STFC Central Michigan University, CMU Magyar Tudományos Akadémia, MTA Nuclear Physics, NP Los Alamos National Laboratory, LANL, (L1955, 89233218CNA000001) Los Alamos National Laboratory, LANL NSCL, (PHY-1714153) Narodowe Centrum Nauki, NCN, (2019/33/N/ST2/03023, 2020/36/T/ST2/00547, 2017/01/X/ST2/01144, 2020/39/B/ST2/02346, UMO-2015/18/E/ST2/00217) Narodowe Centrum Nauki, NCN U.S. Department of Energy, USDOE, (DE-FG02-96ER40983, DE-AC05-00OR22725, DE-NA0002132) U.S. Department of Energy, USDOE National Science Foundation, NSF, (PHY-1430152, PHY-1565546) National Science Foundation, NSF Ministerio de Economía y Competitividad, MINECO, (FPA2011-28770-C03-03, FPA2014-52823-C2-2-P, FPA2011-06419, SEV-2014-0398, FPA2014-52823-C2-1-P, IJCI-2014-19172) Ministerio de Economía y Competitividad, MINECO National Research Foundation of Korea, NRF, (2015H1A2A1030275, 2016K1A3A7A09005575) National Research Foundation of Korea, NRF UK Research and Innovation, UKRI, (ST/V001027/1) UK Research and Innovation, UKRI Generalitat Valenciana, GVA, (PROMETEO/2019/007) Generalitat Valenciana, GVA Oak Ridge National Laboratory, ORNL, (DE-SC0016988) Oak Ridge National Laboratory, ORNL Japan Society for the Promotion of Science, JSPS, (19340074, 17H06090, 22H04946, 14F04808, 20H05648, 25247045) Japan Society for the Promotion of Science, JSPS Natural Sciences and Engineering Research Council of Canada, NSERC, (22K14053, RGPAS 462257-2014, SAPIN-2014-00028) Natural Sciences and Engineering Research Council of Canada, NSERC European Commission FP7/EURATOM, (ST/N00244X/1, 605203, ST//P004598/1) Nemzeti Kutatási Fejlesztési és Innovációs Hivatal, NKFI, (NN128072) Nemzeti Kutatási Fejlesztési és Innovációs Hivatal, NKFI 

主　　题：Beta decay Electromagnetic transitions Level densities Nuclear structure & decays Thermal & statistical models 59 ≤ A ≤ 89 

摘      要：β-delayed γ-neutron spectroscopy has been performed on the decay of A=84 to 87 gallium isotopes at the RI-beam Factory at the RIKEN Nishina Center using a high-efficiency array of He3 neutron counters (BRIKEN). β−2n−γ events were measured in the decays of all of the four isotopes for the first time, which is direct evidence for populating the excited states of two-neutron daughter nuclei. Detailed decay schemes with the γ branching ratios were obtained for these isotopes, and the neutron emission probabilities (Pxn) were updated from the previous study. Hauser-Feshbach statistical model calculations were performed to understand the experimental branching ratios. We found that the P1n and P2n values are sensitive to the nuclear level densities of 1n daughter nuclei and showed that the statistical model reproduced the P2n/P1n ratio better when experimental levels plus shell-model level densities fit by the Gilbert-Cameron formula were used as the level-density input. We also showed the neutron and γ branching ratios are sensitive to the ground-state spin of the parent nucleus. Our statistical model analysis suggested J≤3 for the unknown ground-state spin of the odd-odd nucleus Ga86, from the Iγ(4+→2+)/Iγ(2+→0+) ratio of Ga84 and the P2n/P1n ratio. These results show the necessity of detailed understanding of the decay scheme, including data from neutron spectroscopy, in addition to γ measurements of the multineutron emitters.