天体环境下^(66)Fe的电子俘获几率计算

Calculations of electron capture rates of ^(66)Fe in astrophysical enviroment

弱相互作用几率的计算对于原子核物理和核天体物理具有非常重要的作用.本文选取在天体环境中非常重要的核素^(66)Fe,考虑一级禁戒跃迁,利用壳模型计算了^(66)Fe在不同天体环境下的电子俘获几率,着重考察了容许Gamow-Teller跃迁和禁戒跃迁的贡献.结果发现,在一些天体环境下,禁戒跃迁对于电子俘获几率有重要贡献,其中非唯一型禁戒跃迁起主要作用.我们的结果对于研究原子核弱相互作用和天体环境下的核素合成和演化具有重要作用.

The calculation of weak interaction rates plays a very important role in studying nuclear physics and nuclear astrophysics.In this work,we calculate the electron capture rate of^(66)Fe in the framework of shell model.We mainly focus on the contribution of allowed transition and forbidden transition to the total rate.It is found that in some astrophysical environments the forbidden transition is very important in contribution to the electron capture rate,in which the non-unique forbidden transition plays a major role.This is very important for nuclear structures and astrophysics.