^(133)Sm的(EC+β^+)衰变和^(133)Pr的1.1s同质异能态  

(EC+β^+) Decay of ^(133)Sm and 1.1s Isomer of ^(133) Pr

作　　者：王旭东[1] 谢元祥[1] 徐树威[1] 李占奎[1] 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

出　　处：《高能物理与核物理》2002年第8期797-802,共6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 (1 9975 0 5 7;1 0 0 0 5 0 1 1 );中国科学院计划局资助~~

摘　　要：通过96 Ru( 4 0 Ca ,ln2p)反应 ,采用氦喷嘴带传输系统和X γ与γ γ符合测量方法 ,首次建议了133Sm的简单的 (EC + β+)衰变纲图 .由于Ru靶中含有98— 10 2 Ru的成分 ,同时产生了133Pr,并首次测定了133Pr的 1 1 / 2 - 同质异能态的寿命为( 1 .1± 0 .2 )s.用单粒子模型提取了131,133,135 ,137Pr的 1 1 / 2 - 同质异能态的约化跃迁几率的实验值 ,并与Weisscopf近似估计进行了比较 .By irradiation of an enriched target of 96 Ru with 40 Ca and using a helium jet fast tape transport system in combination with X γ and γ γ coincidence measurements,the very neutron deficient isotope 133 Sm was produced and studied. A simple(EC+β +) decay scheme of 133 Sm is proposed for the first time. A by product 133 Pr was produced simultaneously because of the 98\_102 \ \ Ru contents of the ruthenium target. The half life of an 11/2 - low lying isomeric state in 133 Pr has been measured to be (1.1±0.2)s. Using single particle model,the reduced transition probabilities of the 11/2 - isomers in 131,133,135,137 \ \ \ \ Pr are extracted from their experimental half lives and compared with the Weisskopf estimate.

关 键 词：^133Sm ^133Pr (EC+β^+)衰变纲图 同质异能态 半衰期 约化跃迁几率 钐^133 原子核 镨^133 

分 类 号：O571.3[理学—粒子物理与原子核物理]