Low-lying dipole response in the relativistic quasiparticle time blocking approximation and its influence on neutron capture cross sections

E. Litvinova, H. P. Loens, K. Langanke, G. Martinez-Pinedo, T. Rauscher, P. Ring, Friedrich-Karl Thielemann, V. Tselyaev

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73 Citations (Scopus)
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Abstract

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.

Original languageEnglish
Pages (from-to)26-37
Number of pages12
JournalNuclear Physics A
Volume823
Issue number1-4
DOIs
Publication statusPublished - 15 May 2009

Keywords

  • STRENGTH FUNCTIONS
  • Astrophysical reaction rates
  • Neutron capture
  • R-PROCESS
  • r-process
  • LEVEL DENSITIES
  • Relativistic many-body theory
  • ASTROPHYSICAL REACTION-RATES
  • MODEL-CALCULATIONS
  • NUCLEI
  • Hauser-Feshbach theory
  • PHOTONS

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