摘要
利用能量为 1 61— 1 75MeV的32 S束流 ,通过反应118Sn( 32 S ,1p4n)产生了145 Tb的高自旋态 .进行了γ射线的激发函数、γ γ t符合测量 .首先建议了由 2 4条能级和 4 2条γ跃迁组成的145 Tb核的能级纲图 ,并指定了各条能级的自旋值及部分低位能级的宇称 .用一个πh11/ 2 价质子与144 Gd核芯激发态的耦合定性地解释了145
High-spin states of 143Tb have been studied via the 118Sn( 32S,1p4n) 145Tb reaction by means of in-beam γ-ray spectroscopy. Measurements of γ-ray excitation functions and γ-γ-t coincidences were performed with 12 BGO(AC)HPGe detectors. A level scheme for 145Tb including 41 γ-rays which come from the deexcitations of the 24 levels, has been established for the first time based on an analysis of the γ-ray excitation functions, γ-γ coincidence relationships, intensity balances and cross-over transitions. The spins for most of the levels in the scheme are assigned according to the results of the measured γ-ray anisotropies. Considering the structure similarity between 143Eu and 145Tb, the low-lying levels in 145Tb are interpreted by coupling a h 9/2 proton to the excited states in 144 Gd core.
出处
《高能物理与核物理》
EI
CSCD
北大核心
2002年第4期359-363,共5页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金 ( 1 0 0 0 5 0 1 2
1 0 0 2 5 5 2 5
1 0 0 75 0 6 2 )
中国科学院百人计划
国家重点基础研究发展规划(G2 0 0 0 0 774 0 0 )资助~~
