Coupled-channel models of direct-semidirect capture via giant-dipole resonances

I. J. Thompson, J. E. Escher, G. Arbanas

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Semidirect capture, a two-step process that excites a giant-dipole resonance followed by its radiative de-excitation, is a dominant process near giant-dipole resonances, that is, for incoming neutron energies within 5-20 MeV. At lower energies such processes may affect neutron capture rates that are relevant to astrophysical nucleosynthesis models. We implement a semidirect capture model in the coupled-channel reaction code Fresco and validate it by comparing the cross section for direct-semidirect capture 208Pb(n,γ)209Pb to experimental data. We also investigate the effect of low-energy electric dipole strength in the pygmy resonance. We use a conventional single-particle direct-semidirect capture code Cupido for comparison. Furthermore, we present and discuss our results for direct-semidirect capture reaction 130Sn(n,γ)131Sn, the cross section of which is known to have a significant effect on nucleosynthesis models.

Original languageEnglish
Pages (from-to)292-294
Number of pages3
JournalNuclear Data Sheets
Volume118
Issue number1
DOIs
StatePublished - Apr 2014

Funding

rich (LLNL) for useful suggestions and the Cupido code and Arthur Kerman for useful discussions. This work was funded by the DOE Topical Collaboration TORUS (www.reactiontheory.org). This manuscript has been authored by the Oak Ridge National Laboratory, managed by UT-Battelle LLC under Contract No. DE-AC05-00OR22725, and by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344, with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes.

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