Half-lives and fine structure for the α decay of deformed even-even nuclei  

作　　者：NI DongDong1,2 & REN ZhongZhou1,2,3 1Department of Physics, Nanjing University, Nanjing 210093, China 2Kavli Institute for Theoretical Physics China, Beijing 100190, China 3Center of Theoretical Nuclear Physics, National Laboratory of Heavy-Ion Accelerator, Lanzhou 730000, China 

出　　处：《Science China(Physics,Mechanics & Astronomy)》2011年第S1期24-31,共8页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 10535010, 10675090, 10775068, 10735010, 10975072and 11035001);the National Basic Research Program of China (GrantNos. 2007CB815004 and 2010CB327803);the Chinese Academy of Sciences Knowledge Innovation Project (Grant No. KJCX2-SW-N02);the Research Fund of Doctoral Point (RFDP) (Grant No. 20070284016)

摘　　要：The α-decay properties of well-deformed even-even nuclei are systematically calculated within the multichannel cluster model (MCCM). Instead of working in the WKB framework, the quasibound solution to the coupled Schro¨dinger equation is presented with outgoing wave boundary conditions, and the coupling potential is taken into full account in terms of the general quantum theories. The calculated α-decay half-lives are found to agree well with the experimental data with a mean factor of less than 2. The fine structure observed in α decay is also well reproduced by the four-channel microscopic calculation. Very strikingly, the MCCM can give relatively precise descriptions of the branching ratio to excited 4+ states, which is often overestimated in the usual WKB calculations. We expect it to be a significant development of theoretical models toward quantitative descriptions of α transitions to high-spin daughter states.The α-decay properties of well-deformed even-even nuclei are systematically calculated within the multichannel cluster model (MCCM). Instead of working in the WKB framework, the quasibound solution to the coupled Schro¨dinger equation is presented with outgoing wave boundary conditions, and the coupling potential is taken into full account in terms of the general quantum theories. The calculated α-decay half-lives are found to agree well with the experimental data with a mean factor of less than 2. The fine structure observed in α decay is also well reproduced by the four-channel microscopic calculation. Very strikingly, the MCCM can give relatively precise descriptions of the branching ratio to excited 4+ states, which is often overestimated in the usual WKB calculations. We expect it to be a significant development of theoretical models toward quantitative descriptions of α transitions to high-spin daughter states.

关 键 词：α DECAY HALF-LIVES CLUSTER model coupled CHANNEL approach 

分 类 号：O571.321[理学—粒子物理与原子核物理]