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Article: Strong oneneutron emission from twoneutron unbound states in β decays of the rprocess nuclei 86,87Ga
Title  Strong oneneutron emission from twoneutron unbound states in β decays of the rprocess nuclei 86,87Ga 

Authors  Yokoyama, RGrzywacz, RRasco, BCBrewer, NRykaczewski, KPDillmann, ITain, JLNishimura, SAhn, DSAlgora, AAllmond, JMAgramunt, JBaba, HBae, SBruno, CGCaballeroFolch, RCalvino, FColemanSmith, PJCortes, GDavinson, TDomingoPardo, CEstrade, AFukuda, NGo, SGriffin, CJHa, JHall, OHarknessBrennan, LJHeideman, JIsobe, TKahl, DKarny, MKawano, TKhiem, LHKing, TTKiss, CGKorgul, AKubono, SLabiche, MLazarus, ILiang, JLiu, JLorusso, GMadurga, MMatsui, KMiernik, KMontes, FMorales, AIMorrall, PNepal, NPage, RDPhong, VHPiersa, MPrydderch, MPucknell, VFERajabali, MMRubio, BSaito, YSakurai, HShimizu, YSimpson, JSingh, MStracener, DWSumikama, TSurman, RSuzuki, HTakeda, HTarifeñoSaldivia, AThomas, SLTolosaDelgado, AWolińskaCichocka, MWoods, PJXu, XX 
Keywords  Neutrons Nuclei Βdecay halflives 
Issue Date  2019 
Publisher  American Physical Society. The Journal's web site is located at http://journals.aps.org/prc/ 
Citation  Physical Review C: covering nuclear physics, 2019, v. 100 n. 3, p. 031302:1031302:6 How to Cite? 
Abstract  βdelayed oneneutron and twoneutron branching ratios (P1n and P2n) have been measured in the decay of A=84 to 87 Ga isotopes at the RadioactiveIsotope Beam Factory (RIBF) at the RIKEN Nishina Center using a highefficiency array of He3 neutron counters (BRIKEN). Twoneutron emission was observed in the decay of Ga84,85,87 for the first time and the branching ratios were measured to be P2n=1.6(2)%,1.3(2)%, and 10.2(28)stat(5)sys%, respectively. Oneneutron branching ratio of Ga87(P1n=81(9)stat(8)sys%) and halflife of 29(4) ms were measured for the first time. The branching ratios of Ga86 were also measured to be P1n=74(2)stat(8)sys% and 16.2(9)stat(6)sys% with better precision than a previous study. The observation that P1n>P2n for both Ga86,87 was unexpected and is interpreted as a signature of dominating oneneutron emission from the twoneutron unbound excited states in Ge86,87. In order to interpret the experimental results, shellmodel and HauserFeshbach statistical model calculations of delayed particle and γray emission probabilities were performed. This model framework reproduces the experimental results. The shell model alone predicts P2n significantly larger than P1n for the Ga87 decay, and it is necessary to invoke a statistical description to successfully explain the observation that P1n>P2n. Our new results demonstrate the relevance and importance of a statistical description of neutron emission for the prediction of the decay properties of multineutron emitters and that it must be included in the rprocess modeling. © 2019 American Physical Society. 
Persistent Identifier  http://hdl.handle.net/10722/278601 
ISSN  2019 Impact Factor: 2.988 
DC Field  Value  Language 

dc.contributor.author  Yokoyama, R   
dc.contributor.author  Grzywacz, R   
dc.contributor.author  Rasco, BC   
dc.contributor.author  Brewer, N   
dc.contributor.author  Rykaczewski, KP   
dc.contributor.author  Dillmann, I   
dc.contributor.author  Tain, JL   
dc.contributor.author  Nishimura, S   
dc.contributor.author  Ahn, DS   
dc.contributor.author  Algora, A   
dc.contributor.author  Allmond, JM   
dc.contributor.author  Agramunt, J   
dc.contributor.author  Baba, H   
dc.contributor.author  Bae, S   
dc.contributor.author  Bruno, CG   
dc.contributor.author  CaballeroFolch, R   
dc.contributor.author  Calvino, F   
dc.contributor.author  ColemanSmith, PJ   
dc.contributor.author  Cortes, G   
dc.contributor.author  Davinson, T   
dc.contributor.author  DomingoPardo, C   
dc.contributor.author  Estrade, A   
dc.contributor.author  Fukuda, N   
dc.contributor.author  Go, S   
dc.contributor.author  Griffin, CJ   
dc.contributor.author  Ha, J   
dc.contributor.author  Hall, O   
dc.contributor.author  HarknessBrennan, LJ   
dc.contributor.author  Heideman, J   
dc.contributor.author  Isobe, T   
dc.contributor.author  Kahl, D   
dc.contributor.author  Karny, M   
dc.contributor.author  Kawano, T   
dc.contributor.author  Khiem, LH   
dc.contributor.author  King, TT   
dc.contributor.author  Kiss, CG   
dc.contributor.author  Korgul, A   
dc.contributor.author  Kubono, S   
dc.contributor.author  Labiche, M   
dc.contributor.author  Lazarus, I   
dc.contributor.author  Liang, J   
dc.contributor.author  Liu, J   
dc.contributor.author  Lorusso, G   
dc.contributor.author  Madurga, M   
dc.contributor.author  Matsui, K   
dc.contributor.author  Miernik, K   
dc.contributor.author  Montes, F   
dc.contributor.author  Morales, AI   
dc.contributor.author  Morrall, P   
dc.contributor.author  Nepal, N   
dc.contributor.author  Page, RD   
dc.contributor.author  Phong, VH   
dc.contributor.author  Piersa, M   
dc.contributor.author  Prydderch, M   
dc.contributor.author  Pucknell, VFE   
dc.contributor.author  Rajabali, MM   
dc.contributor.author  Rubio, B   
dc.contributor.author  Saito, Y   
dc.contributor.author  Sakurai, H   
dc.contributor.author  Shimizu, Y   
dc.contributor.author  Simpson, J   
dc.contributor.author  Singh, M   
dc.contributor.author  Stracener, DW   
dc.contributor.author  Sumikama, T   
dc.contributor.author  Surman, R   
dc.contributor.author  Suzuki, H   
dc.contributor.author  Takeda, H   
dc.contributor.author  TarifeñoSaldivia, A   
dc.contributor.author  Thomas, SL   
dc.contributor.author  TolosaDelgado, A   
dc.contributor.author  WolińskaCichocka, M   
dc.contributor.author  Woods, PJ   
dc.contributor.author  Xu, XX   
dc.date.accessioned  20191021T02:10:34Z   
dc.date.available  20191021T02:10:34Z   
dc.date.issued  2019   
dc.identifier.citation  Physical Review C: covering nuclear physics, 2019, v. 100 n. 3, p. 031302:1031302:6   
dc.identifier.issn  24699985   
dc.identifier.uri  http://hdl.handle.net/10722/278601   
dc.description.abstract  βdelayed oneneutron and twoneutron branching ratios (P1n and P2n) have been measured in the decay of A=84 to 87 Ga isotopes at the RadioactiveIsotope Beam Factory (RIBF) at the RIKEN Nishina Center using a highefficiency array of He3 neutron counters (BRIKEN). Twoneutron emission was observed in the decay of Ga84,85,87 for the first time and the branching ratios were measured to be P2n=1.6(2)%,1.3(2)%, and 10.2(28)stat(5)sys%, respectively. Oneneutron branching ratio of Ga87(P1n=81(9)stat(8)sys%) and halflife of 29(4) ms were measured for the first time. The branching ratios of Ga86 were also measured to be P1n=74(2)stat(8)sys% and 16.2(9)stat(6)sys% with better precision than a previous study. The observation that P1n>P2n for both Ga86,87 was unexpected and is interpreted as a signature of dominating oneneutron emission from the twoneutron unbound excited states in Ge86,87. In order to interpret the experimental results, shellmodel and HauserFeshbach statistical model calculations of delayed particle and γray emission probabilities were performed. This model framework reproduces the experimental results. The shell model alone predicts P2n significantly larger than P1n for the Ga87 decay, and it is necessary to invoke a statistical description to successfully explain the observation that P1n>P2n. Our new results demonstrate the relevance and importance of a statistical description of neutron emission for the prediction of the decay properties of multineutron emitters and that it must be included in the rprocess modeling. © 2019 American Physical Society.   
dc.language  eng   
dc.publisher  American Physical Society. The Journal's web site is located at http://journals.aps.org/prc/   
dc.relation.ispartof  Physical Review C: covering nuclear physics   
dc.rights  Copyright 2019 by The American Physical Society. This article is available online at https://doi.org/10.1103/PhysRevC.100.031302.   
dc.subject  Neutrons   
dc.subject  Nuclei   
dc.subject  Βdecay halflives   
dc.title  Strong oneneutron emission from twoneutron unbound states in β decays of the rprocess nuclei 86,87Ga   
dc.type  Article   
dc.identifier.email  Liu, J: jiajian@hku.hk   
dc.identifier.email  Xu, XX: xinxing@hku.hk   
dc.description.nature  published_or_final_version   
dc.identifier.doi  10.1103/PhysRevC.100.031302   
dc.identifier.scopus  eid_2s2.085072962817   
dc.identifier.scopus  eid_2s2.085072962817   
dc.identifier.hkuros  307242   
dc.identifier.volume  100   
dc.identifier.issue  3   
dc.identifier.spage  031302:1   
dc.identifier.epage  031302:6   
dc.publisher.place  United States   