sd壳层极丰质子核的β延迟衰变谱学  

b-delayed Decay Spectroscopies of Extremely Proton-rich Nuclei in sd-shell

作　　者：林承键[1,2] 徐新星 孙立杰[1,4] 贾会明[1] 杨磊 王东玺[1] 马南茹[1] 杨峰 钟福鹏[1,2] 潘敏[1,5] 温培威 姚永进 钟善豪 骆天鹏 RIBLL合作组 LIN Chengjian;XU Xinxing;SUN Lijie;JIA Huiming;YANG Lei;WANG Dongxi;MA Nanru;YANG Feng;ZHONG Fupeng;PAN Min;WEN Peiwei;YAO Yongjin;ZHONG Shanhao;LUO Tianpeng;RIBLL Collaboration(China Institute of Atomic Energy,Beijing 102413,China;Guangxi Normal University,Guilin 541004,Guangxi,China;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;Shanghai Jiao Tong University,Shanghai 200240,China;Beihang University,Beijing 100191,China;不详)

机构地区：[1]中国原子能科学研究院,北京102413 [2]广西师范大学物理科学与技术学院,广西桂林541004 [3]中国科学院近代物理研究所,兰州730000 [4]上海交通大学物理与天文学院,上海200240 [5]北京航空航天大学物理科学院,北京100191 [6]不详

出　　处：《原子核物理评论》2020年第3期492-499,共8页Nuclear Physics Review

基　　金：国家重点基础研究发展规划项目(2018YFA0404404);国家自然科学基金资助项目(11635015,U1867212,U1732145,11705825,11805280);国家财政部稳定支持研究经费资助项目(WDJC-2019-13)。

摘　　要：远离β稳定线原子核的结构是当前核物理领域的一个前沿热点。β衰变谱学是研究核结构的重要方法,尤其适用于低产额的滴线核。本文回顾了近年来在RIBLL1装置上开展的sd壳区极丰质子核β延迟衰变谱学的实验研究。该工作获得了15个原子核精确的半衰期、衰变子核的质量、β延迟的质子和双质子发射以及γ跃迁的能谱、分支比和比较半衰期等数据,并重建了衰变纲图,大大丰富了此区域内质子滴线附近原子核的衰变谱学信息。还介绍了探测器阵列和实验方法,概括了所研究核的衰变性质和半衰期等。特别地,对几个典型核,^(20)Mg和^(22)Si以及^(26)P和^(27)S的衰变性质进行了阐述。此外,对相关话题,如三体力、镜像核衰变不对称性、与银河系中^(26)Al超丰问题相关的热核反应率等问题进行了探讨。Structure of nucleus far from theβ-stability line is a currently hot topic in the field of nuclear physics.Theβ-decay spectroscopy is an important method to study the nuclear structure,especially for the drip-line nuclei with low yield.This paper reviews the experimental studies ofβ-delayed decay spectroscopies for the extremely proton-rich nuclei in sd-shell recently carried out at the RIBLL1 facility.The precise data on half-lives,masses of decay daughter nuclei,energy spectra and branch ratios ofβ-delayed proton and two-proton decays as well asγtransitions for 15 nuclei have been obtained,which greatly enrich the spectroscopy information of the nuclei close to the proton drip-line in this region.In particular,the decay properties of some nuclei like^(22)Si and^(20)Mg as well as^(27)S and^(26)P are described in detail.Moreover,some hot topics related to the three-body force,the decay asymmetry of mirror nuclei,and the thermomuclear reaction rates related to the super-abundant issue of ^(26)A1 in the Milky Way are discussed.

关 键 词：极丰质子核 β延迟衰变 半衰期 天体核反应 镜像不对称性 

分 类 号：O572.211[理学—粒子物理与原子核物理]