摘要
Nuclear reaction rate A is a significant factor in processes of nucleosyntheses.A multi-layer directed-weighted nuclear reaction network,in which the reaction rate is taken as the weight,and neutron,proton,4 He and the remainder nuclei as the criteria for different reaction layers,is for the first time built based on all thermonuclear reactions in the JINA REACLIB database.Our results show that with the increase in the stellar temperature T9,the distribution of nuclear reaction rates on the R-layer network demonstrates a transition from unimodal to bimodal distributions.Nuclei on the R-layer in the region of A=[1,2.5×101]have a more complicated out-going degree distribution than that in the region of A=[1011,1013],and the number of involved nuclei at T9=1 is very different from the one at T9=3.The redundant nuclei in the region of A=[1,2.5×101]at T9=3 prefer(γ,p)and(γ,α)reactions to the ones at T9=1,which produce nuclei around theβstable line.This work offers a novel way to the big-data analysis on the nuclear reaction network at stellar temperatures.
作者
Huan-Ling Liu
Ding-Ding Han
Peng Ji
Yu-Gang Ma
刘焕玲;韩定定;纪鹏;马余刚(Key Laboratory of Nuclear Physics and Ion-beam Application(MOE),Institute of Modern Physics,Fudan University,Shanghai 200433,China;Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;School of Information Science and Technology,Fudan University,Shanghai 200433,China;The Institute of Science and Technology for Brain-inspired Intelligence(ISTBI),Fudan University,Shanghai 200433,China)
基金
Supported by the National Natural Science Foundation of China(Grant Nos.11890714,11421505,11875133,and 11075057)
the National Key R&D Program of China(Grant No.2018YFB2101302)
the Key Research Program of Frontier Sciences of the CAS(Grant No.QYZDJ-SSW-SLH002)
the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB34030200)。
