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Abstract
摘要 |
Gamow-Teller (GT) transitions in atomic nuclei not only provide valuable information on the spin-isospin-dependent parts of the nuclear effective interaction, but also play dominant roles in weak-interaction processes, such as beta decay. Random-phase approximation (RPA) model is widely used for the calculation of GT response and beta-decay half-lives. However, RPA cannot reproduce the width of GT resonance, and sometimes overestimates beta-decay half-lives. To overcome these problems, the particle-vibration coupling (PVC) effect is included on top of the RPA model. It turns out that the RPA+PVC model gives a good description of the line shape of the GT strength function, and reproduces particularly well the measured width; the half-lives in magic nuclei are reduced due to the increase of the phase space available for beta-decay, which leads to a very good agreement between theoretical and experimental lifetimes. The extension of the RPA+PVC model to the study of superfluid nuclei will also be briefly introduced. |
