The reactions 25Mg(α,n)28Si, 26Mg(α,n)29Si and their possible impact on nucleosynthesis

S. Falahat, M. Couder, J. Görres, K. L. Kratz, S. O'Brien, U. Ott, M. Pignatari, E. Stech, M. Wiescher

Research output: Contribution to journalConference article

Abstract

At the time neon burning is activated in massive stars, large amounts of 25Mg and 26Mg have been accumulated from the previous evolutionary phases. In particular, at typical temperatures for neon shell burning, the reactions 25Mg(α,n)28Si and 26Mg(α,n)29Si become efficient providing additional neutron fluxes and affecting the nucleosynthesis distribution. Good knowledge of the reaction rates is required to study their effect on nucleosynthesis during neon shell burning conditions (T9 ≲ 1.5, where T9 is the temperature in gigakelvin). At the Nuclear Science Laboratory, University of Notre Dame, IN, USA we developed a neutron detector to investigate the 25Mg(α,n)28Si and 26Mg(α,n) 29Si reactions as possible neutron sources during neon shell burning. In the present paper we briefly describe the experimental procedures developed to measure those reactions. Finally, we discuss the impact of 25Mg(α,n) 28Si and 26Mg(α,n) 29Si on the s-process nucleosynthesis for the barium isotopes.

Original languageEnglish
Pages (from-to)303-307
Number of pages5
JournalAIP Conference Proceedings
Volume1090
DOIs
Publication statusPublished - Apr 23 2009
Event13th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics - Cologne, Germany
Duration: Aug 25 2009Aug 29 2009

Keywords

  • Mg(α,n)Si
  • Mg(α,n) Si
  • GEANT4
  • Magnesium targets
  • MCNP5
  • Neutron detector
  • Nucleosynthesis
  • S-process

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Falahat, S., Couder, M., Görres, J., Kratz, K. L., O'Brien, S., Ott, U., Pignatari, M., Stech, E., & Wiescher, M. (2009). The reactions 25Mg(α,n)28Si, 26Mg(α,n)29Si and their possible impact on nucleosynthesis. AIP Conference Proceedings, 1090, 303-307. https://doi.org/10.1063/1.3087033