丰中子核^(63,65,67)Mn的在束γ谱学研究  

In-beamγSpectroscopy of Neutron-rich ^(63,65,67)Mn

作　　者：卢洪洋 刘小雨 丁兵[1] 刘忠[1,2] P.Doornenbal A.Obertelli S.MLenzi P.M.Walker L.X.Chung B.D.Linh G.Authelet H.Baba D.Calvet F.Chateau A.Corsi A.Delbart J.M.Gheller A.Gillibert T.Isobe V.Lapoux M.Matsushita S.Momiyama T.Motobayashi M.Niikura F.Nowacki H.Otsu C.Peron A.Peyaud E.C.Pollacco J.Y.Rousse H.Sakurai M.Sasano Y.Shiga S.Takeuchi R.Taniuchi T.Uesaka H.Wang K.Yoneda LU Hongyang;LIU Xiaoyu;DING Bing;LIU Zhong;P.Doornenbal;A.Obertelli;S.M.Lenzi;P.M.Walker;L.X.Chung;B.D.Linh;G.Authelet;H.Baba;D.Calvet;F.Chateau;A.Corsi;A.Delbart;J.M.Gheller;A.Gillibert;T.Isobe;V.Lapoux;M.Matsushita;S.Momiyama;T.Motobayashi;M.Niikura;F.Nowacki;H.Otsu;C.Peron;A.Peyaud;E.C.Pollacco;J.Y.Rousse;H.Sakurai;M.Sasano;Y.Shiga;S.Takeuchi;R.Taniuchi;T.Uesaka;H.Wang;K.Yoneda(Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China;RIKEN Nishina Center,2-1 Hirosawa,Wako,Saitama 351-0198,Japan;IRFU,CEA,UniversitéParis-Saclay,F-91191Gif-sur-Yvette,France;Institut für Kernphysik,Technische Universität Darmstadt,64289Darmstadt,Germany;Universitádi Padova and INFN,Sezione di Padova,I-35131Padova,Italy;Department of Physics,University of Surrey,Guildford GU27XH,United Kingdom;Institute for Nuclear Science&Technology,VINATOM,179Hoang Quoc Viet,Cau Giay,Hanoi,Vietnam;Center for Nuclear Study,University of Tokyo,RIKEN campus,Wako,Saitama 351-0198,Japan;Department of Physics,University of Tokyo,7-3-1 Hongo,Bunkyo,Tokyo 113-0033,Japan;IPHC,CNRS/IN2P3,Universitéde Strasbourg,F-67037Strasbourg,France;Department of Physics,Rikkyo University,3-34-1 Nishi-Ikebukuro,Toshima,Tokyo 172-8501,Japan)

机构地区：[1]中国科学院近代物理研究所,兰州730000 [2]中国科学院大学,北京100049 [3]RIKEN Nishina Center,2-1 Hirosawa,Wako,Saitama 351-0198,Japan [4]IRFU,CEA,UniversitéParis-Saclay,F-91191Gif-sur-Yvette,France [5]Institut für Kernphysik,Technische Universität Darmstadt,64289Darmstadt,Germany [6]Universitádi Padova and INFN,Sezione di Padova,I-35131Padova,Italy [7]Department of Physics,University of Surrey,Guildford GU27XH,United Kingdom [8]Institute for Nuclear Science&Technology,VINATOM,179Hoang Quoc Viet,Cau Giay,Hanoi,Vietnam [9]Center for Nuclear Study,University of Tokyo,RIKEN campus,Wako,Saitama 351-0198,Japan [10]Department of Physics,University of Tokyo,7-3-1 Hongo,Bunkyo,Tokyo 113-0033,Japan [11]IPHC,CNRS/IN2P3,Universitéde Strasbourg,F-67037Strasbourg,France [12]Department of Physics,Rikkyo University,3-34-1 Nishi-Ikebukuro,Toshima,Tokyo 172-8501,Japan

出　　处：《原子核物理评论》2020年第3期548-553,共6页Nuclear Physics Review

基　　金：国家自然科学基金委员会-中国科学院大科学装置科学研究联合基金(U2032144);国家自然科学基金资助项目(11961141004,11735017,11675225,11635003);中国科学院战略性先导科技专项(XDB34000000);科技重点研发计划项目(2018YFA0404402)。

摘　　要：利用放射性束68Fe轰击液氢靶引起的敲出反应,研究了极端丰中子核^(63,65,67)Mn的激发态,指认了它们的自旋宇称,建立了这三个原子核的能级纲图。纲图包含11/2^(-)、9/2^(-)和7/2^(-)三个激发态以及5/2^(-)_(g.s.)基态,它们由三条ΔI=1的γ跃迁连接。这种能级结构与K=5/2时强耦合转动带的特征一致。使用改进的LNPS有效相互作用(LNPSm)的大规模壳模型计算能很好地重现观测到的能级。计算表明,^(65,67)Mn的低位激发态都主要包含处于4p-4h的中子组态和1p-1h的质子组态。基于实验结果发现,在吸积中子星壳中,与质量数A=63相关的Urea中微子冷却效果比预期的要强很多,而A=65,67的冷却效果比预期的更弱。The excited states in^(63,65,67)Mn have been studied via in-beamγ-ray spectroscopy following the knockout reaction of 68 Fe by bombarding a liquid hydrogen target.Similar level schemes have been established for the three isotopes,and the level schemes consist of the 11/2^(-),9/2^(-),7/2^(-)and 5/2^(-)_(g.s.)states,which are connected byΔI=1.The level sequences of^(65,67)Mn show features of strongly coupled rotational band with Kπ=5/2^(-)expected for the well deformed nuclei.Large-scale shell-model calculations using the modified LNPS(LNPSm)effective interaction reproduce the observed levels remarkably well and suggest the dominance of 4-particle-4-hole(4 p-4 h)neutron configurations and 1-particle-1-hole(1 p-1 h)proton configurations for all the states.The experimental results show an enhancement of Urea neutrino cooling in the accreted neutron crust associated with A=63 nuclei and rule out significant cooling from A=65,67.

关 键 词：在束Γ谱学 翻转岛 丰中子核 壳演化 

分 类 号：O571.53[理学—粒子物理与原子核物理]