Nucleosynthesis in the Cd-In-Sn region

Zs Németh, F. Käppeler, C. Theis, T. Belgya, S. W. Yates

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

The abundance contributions from the possible nucleosynthesis mechanisms to the rare isotopes 113In, 114Sn, and 115Sn are investigated. The level scheme of 113Cd was studied via the (n, n′γ) reaction up to 2.5 MeV excitation energy, searching for gateway levels that can provide for thermal equilibration of ground state and isomer under stellar conditions. The experiment confirmed the lowest gateway level at 522 keV, which provides for thermal equilibrium at temperatures above 108 K, resulting in the destruction of the isomer in all plausible s-process scenarios. Accordingly, the importance of the branching at 113Cd is strongly reduced, allowing only for small s-process yields of 113In, 114Sn, and 115Sn of <0.3%, <0.5%, and <8%, regardless of the model used. The r-contributions to these isotopes were found to range between 0% and 40%, depending on the post-r-process conditions, and are also not sufficient to account for the observed abundances. For 114Sn the remaining abundance contribution can be accounted for by recent p-process calculations, but a different production mechanism seems to be required for 113In and 115Sn.

Original languageEnglish
Pages (from-to)357-365
Number of pages9
JournalAstrophysical Journal
Volume426
Issue number1
DOIs
StatePublished - May 1 1994

Keywords

  • Abundances
  • Nuclear reactions
  • Nucleosynthesis

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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