^(93)Pd的β缓发质子衰变  

β-Delayed Proton Decay of^(93)Pd

作　　者：王旭东[1] 徐树威[1] 李占奎[1] 谢元祥[1] 吴哲英[2] 许甫荣[2] 郭斌[1] 冷长庚[1] 王春芳[1] 于涌[1] 

机构地区：[1]中国科学院近代物理研究所,兰州730000 [2]北京大学技术物理系,北京100871

出　　处：《高能物理与核物理》2003年第4期309-312,共4页High Energy Physics and Nuclear Physics

基　　金：国家重点基础研究发展规划(G2 0 0 0 0 7740 2);国家自然科学基金(19975 0 5 710 0 0 5 01110 175 0 0 2 );中国科学院计划局资助~~

摘　　要：通过58 Ni(40 Ca ,3n2p)反应合成等待点核93 Pd ,采用氦喷嘴带传输系统加p γ符合 ,观测到了它的 β缓发质子衰变 ,测得其半衰期为 (1.3± 0 .2 )s .采用统计模型计算拟合了实验测得的 β缓发质子能谱和布居到质子发射体子核不同终态的分支比 ,指认了93 Pd的基态自旋为 9 2 .用Woods XasonStrutinsky方法计算了93 Pd的核位能面 ,其结果表明93 Pd基态自旋宇称可能为 9 2 + .The β 'waiting point'nucleus 93 Pd has been produced via 58 Ni( 40 Ca,3n2p) reaction. A helium jet fast tape transport system was used in combination with p γ coincidence measurement to identify the β delayed proton precursor 93 Pd , whose half life has been measured to be 1.3±0.2s. The measured energy spectrum of β delayed protons and relative branching ratios to the final states in the daughter nucleus 92 Ru are fitted by a revised statistic model calculation, and then the ground state spin of 93 Pd are assigned to be 9/2. Meanwhile, a nuclear energy potential surface (EPS) calculation is performed by using the Woods Saxon Strutinsky method. The calculated result supports the ground state spin and parity of 9/2 + assignment.

关 键 词：^93Pd 等待点核 Β缓发质子衰变 半衰期 统计模型 核位能面 钯93 天体物理 

分 类 号：O571.33[理学—粒子物理与原子核物理]