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.
|Number of pages||5|
|Journal||AIP Conference Proceedings|
|Publication status||Published - ápr. 23 2009|
|Event||13th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics - Cologne, Germany|
Duration: aug. 25 2009 → aug. 29 2009
ASJC Scopus subject areas
- Physics and Astronomy(all)