AGB星s-过程核合成:中子辐照量渐近分布

s-Process Nucleosynthesis in AGB Stars: the Asymptotic Distribution of Neutron Exposures

根据13C壳层在脉冲间隔期间辐射燃烧释放中子的AGB星s(slow) 过程核合成模型,采用3层简化假设,研究了氦中间壳层的中子辐照量渐近分布。结果表明,中子辐照量分布不再是通常所认为的指数形式,曲线先有一个简短的上升然后再单调下降,但除中子辐照量较低的一个小区域外,分布曲线仍与指数分布非常接近。这与根据恒星模型进行的核合成计算结果一致。

Based on the present s-Process nucleosynthesis models for AGB stars, with^(13)C pocket releasing neutrons radiatively in interpulse period, using the simplified assumption that the^(13)C pocket is subdivided into three layers, the asymptotic distribution of neutron exposures in the He intershell is investigated. Our results show that the asymptotic distribution of neutron exposures is no longer the usually accepted exponential form. The distribution curve first has a brief increase and then decreases monotonously. And apart from a small lower-neutron-exposure region, it is still close to an exponential form. This is consistent with the results of nucleosynthesis calculations in stellar models.