期刊
NUCLEAR PHYSICS A
卷 823, 期 -, 页码 26-37出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nuclphysa.2009.03.009
关键词
Relativistic many-body theory; Hauser-Feshbach theory; Neutron capture; Astrophysical reaction rates; r-process
资金
- Deutsche Forschungsgerneinschaft [SFB 634]
- Swiss National Foundation [200020-122287]
- Russian Federal Education Agency Program [2.1.1/4779]
- Swiss National Science Foundation (SNF) [200020-122287] Funding Source: Swiss National Science Foundation (SNF)
We have computed dipole strength distributions for nickel and tin isotopes within the Relativistic Quasiparticle Time Blocking Approximation (RQTBA). These calculations provide a good description of data, including the neutron-rich tin isotopes (130.132)Sn. The resulting dipole strengths have been implemented in Hauser-Feshbach calculations of astrophysical neutron capture rates relevant for r-process nucleosynthesis studies. The RQTBA calculations show the presence of enhanced dipole strength at energies around the neutron threshold for neutron rich nuclei. The computed neutron capture rates are sensitive to the fine structure of the low lying dipole strength. which emphasizes the importance of a reliable knowledge of this excitation mode. (C) 2009 Elsevier B.V. All rights reserved.
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