恒星内部电荷屏蔽对β衰变率的影响  

The Influence of Electron Screening onβ-Decay Rate in Stellar Interior

作　　者：孙庆强[1] 黄增光[1] 朴红光[1] 罗志全[2] 

机构地区：[1]淮海工学院数理科学系,连云港222005 [2]西华师范大学物理与电子信息学院,南充637002

出　　处：《天文学进展》2006年第4期380-386,共7页Progress In Astronomy

基　　金：国家自然科学基金资助项目(10347008)

摘　　要：针对低能反应和共振跃迁,分析了在恒星内部电荷屏蔽对β衰变率的影响．对共振跃迁的分析是基于核的壳层模型．作为例子,详细计算了电荷屏蔽对56Cr的β衰变的影响．结果表明:在较低温度和高密度下,电荷屏蔽使β衰变率有明显的增加。这对恒星晚期演化和超新星爆发研究可能会有重要的影响。Aiming at the low-energy reaction and Gamow-Teller resonant transition, the influence of electron screening on the β-decay rate in stellar interior is investigated in this paper. As an example, the effect of the screening on β-decay by ^56Cr is calculated. It is shown that the screening increases the β -decay rate evidently in lower temperatures and higher densities. The screening effect may importantly influences the study of stellar late stage evolution and supernova burst.

关 键 词：天体物理学 β衰变率 电荷屏蔽 核合成 恒星演化 

分 类 号：P142[天文地球—天体物理] P144[天文地球—天文学]