满壳层附近禁戒α衰变寿命的研究  

Study on the Unfavored α-Decay Lifetimes around a Closed Shell

作　　者：许昌[1] 任中洲[1] 

机构地区：[1]南京大学物理系,南京210008

出　　处：《高能物理与核物理》2004年第5期502-506,共5页High Energy Physics and Nuclear Physics

基　　金：国家杰出青年基金(10125521);教育部博士重点基金(20010284036);国家重点基础研究发展规划项目(G2000077400);中国科学院创新工程重点项目(KJCX2SWN02)资助~~

摘　　要：发展了α 结团模型并用于研究满壳层 (Z =82 ,N =12 6 )附近的禁戒α衰变 ,对实验新观测到的天然α放射性核素 2 0 9Bi以及N =12 7同中子素链 (Po—U)的α衰变寿命进行了计算 ,理论结果和实验数据能够很好地符合 ,验证了α 结团模型对禁戒α衰变的适用性 .通过引入随质子数变化的α粒子预形成几率公式 ,进一步改进和完善了α 结团模型 .The α-cluster model is extended to study the unfavored α-decay lifetimes around a closed shell. The newly discovered α-decay of 209Bi [Marcillac et al., Nature (London) 422, 2003: 876] and a odd-A N=127 isotones are investigated by the α-cluster model. The experimental decay lifetimes can be reproduced satisfactorily. The application of the α-cluster model to research unfavored α-decays has been proved reliable. The theoretical calculations also reflect the measured α particle preformation factor near magic number (N=126). The α-cluster model is improved by introducing a Z-dependent preformation factor.

关 键 词：原子核物理 禁戒α衰变 衰变寿命 预形成几率 α-结团模型 铋原子核 

分 类 号：O571[理学—粒子物理与原子核物理]