Gao, ZC , Univ Notre Dame, Joint Inst Nucl Astrophys, Notre Dame, IN 46556 USA
部门归属:
Univ Notre Dame, Joint Inst Nucl Astrophys, Notre Dame, IN 46556 USA; Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA; Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA; Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA; China Inst Atom Energy, Beijing 102413, Peoples R China; Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China
英文摘要:
A method for calculation of Gamow-Teller transition rates is developed by using the concept of the Projected Shell Model (PSM). The shell model basis is constructed by superimposing angular-momentum-projected multiquasiparticle configurations, and nuclear wave functions are obtained by diagonalizing the two-body interactions in these projected states. Calculation of transition matrix elements in the PSM framework is discussed in detail, and the effects caused by the Gamow-Teller residual forces and by configuration-mixing are studied. With this method, it may become possible to perform a state-by-state calculation for beta-decay and electron-capture rates in heavy, deformed nuclei at finite temperatures. Our first example indicates that, while experimentally known Gamow-Teller transition rates from the ground state of the parent nucleus are reproduced, stronger transitions from some low-lying excited states are predicted to occur, which may considerably enhance the total decay rates once these nuclei are exposed to hot stellar environments.
