WLW原子核质量模型在γ过程研究中的应用

WLW mass model in nuclearγ-process calculations

本工作利用最近提出的WLW宏观-微观原子核质量模型,在经典r过程框架下很好地描述了太阳系r过程核素丰度分布.与常用的FRDM质量模型相比,新计算更好地再现了A≈135和A≈180质量区的太阳系r过程核素丰度,尤其避免了其他相似计算中A=135附近出现的与观测不符的丰度峰问题.分析表明,这种差异可能暗示WLW更为合理地处理了壳结构和对称能.

The rapid neutron-capture process（r-process）,which is an interdisciplinary field of astrophysics and nuclear physics,is bound up with various characteristics of thousands of neutron-rich exotic nuclei,such as nuclear masses,and the relevant reactions.By employing the WLW microscopic-macroscopic nuclear mass model developed recently,the solar r-process abundance distribution is well reproduced in the classical r-process approach.In comparison with the well known FRDM model,the present calculation better pictures the nuclear region of A≈135 and A≈180,and especially avoids the abundance peaks at A≈135 often obtained in other calculations.The improvement in the r-process calculation may indicate a more suitable description of the evolution of shell structure and symmetry energy towards the drip line in the WLW model.