Re-Os核钟相关核素丰度的网络方程求解

The Solutions of Net work Equation of Re-Os Nuclear Clock Related Nuclide Abundance

187Re-187Os核钟是核纪年学中用来确定银河系年龄的重要核钟,分叉s-过程中元素187Re和187Os的丰度比对于研究187Re-187Os核钟问题起着决定性的作用.根据分叉s-过程网络路径图,给出了分叉s-过程网络方程组;利用四阶龙格库塔法计算出了网络方程组的数值解,进一步画出了分叉系统中各个元素随时间变化的丰度图.的研究及所获得的数值结果,对研究187Re-187Os核钟和银河系的年龄问题有一定的帮助.

According to the abundance variation of long half-life element,Nucleocosmochronology can confirm the ages of stars.The s-process abundance ratio of 187 Re and 187Os play very important role in the research of 187Re-187Os cosmochronology.On the basis of branching s-process network path chart,this paper presents net work equation of branching s-process.Besides,we calculate the numerical solution of the net work equation,using fourth order Ronge-Kutta method.Furthermore,we obtain abundance figure of every element in the branching system as time goes on.The investigate and numerical results obtained in this paper are helpful to the study of 187Re-187Os nuclear clock and the age of the Milky Way.