NEUTRON-RICH ALPHA-RICH FREEZE-OUT AND THE R-PROCESS IN THE HIGH-ENTROPY NEUTRINO-ENERGIZED SUPERNOVA BUBBLE

被引:58
作者
HOWARD, WM [1 ]
GORIELY, S [1 ]
RAYET, M [1 ]
ARNOULD, M [1 ]
机构
[1] UNIV LIBRE BRUXELLES,INST ASTRON & ASTROPHYS,B-1050 BRUSSELS,BELGIUM
关键词
D O I
10.1086/173350
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The high-entropy alpha-rich freeze-out of neutron-rich nuclei suggested by Woosley and Hoffman and the subsequent formation of r-nuclides are studied in the framework of a recent supernova model. The calculations are performed with the help of a single reaction network that is able to describe the establishment of the nuclear statistical equilibrium, the charged-particle reaction freeze-out, and the subsequent neutron captures and beta-decays that produce the r-nuclides. We analyze the effect of using various models for the nuclear binding energies, and in particular the new Extended Thomas-Fermi plus Strutinsky Integral method and the finite-range droplet model. These nuclear mass models are also used to calculate the beta-decay rates with the gross theory. We delineate the range of entropies necessary to produce a solar-system-like distribution of the r-nuclides. We also discuss in detail how the freeze-out affects the final r-process abundance distribution.
引用
收藏
页码:713 / 724
页数:12
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