Calculations of fission rates for r-process nucleosynthesis

被引：97
|
作者：
Panov, IV
Kolbe, E
Pfeiffer, B
Rauscher, T
Kratz, KL
Thielemann, FK
机构：
[1] Univ Basel, CH-4056 Basel, Switzerland
[2] Inst Theoret & Expt Phys, Moscow 117259, Russia
[3] Inst Kernchem, D-55128 Mainz, Germany
来源：
NUCLEAR PHYSICS A | 2005年 / 747卷 / 2-4期
基金：
俄罗斯基础研究基金会;
关键词：
fission; fission rates; r-process;
D O I：
10.1016/j.nuclphysa.2004.09.115
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
Fission plays an important role in the r-process which is responsible; not only for the yields of transuranium isotopes, but may have a strong influence on the formation of the majority of heavy nuclei due to fission recycling. We present calculations of beta-delayed and neutron-induced fission rates, taking into account different fission barriers predictions and mass formulae. It is shown that an increase of fission barriers results naturally in a reduction of fission rates, but that nevertheless fission leads to the termination of the r-process. Furthermore, it is discussed that the probability of triple fission could be high for A > 260 and have an effect on the formation of the abundances of heavy nuclei. Fission after beta-delayed neutron emission is discussed as well as different aspects of the influence of fission upon r-process calculations. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码：633 / 654
页数：22
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