36Cl(n,p)36S cross section from 25 meV to 800 keV and the nucleosynthesis of the rare isotope 36S

Physics – Nuclear Physics

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Inelastic Neutron Scattering, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages, 20<=A<=38

Scientific paper

We have measured the 36Cl(n,p)36S cross section from thermal energy to approximately 800 keV. Parameters for eight resonances between 900 eV and 70 keV were determined in a multilevel fit to our data which also included information from published 36S(p,γ)37Cl measurements. The 36Cl(n,p)36S reaction can play a critical role in the production of the rare isotope 36S in explosive nucleosynthesis and s-process calculations. The astrophysical rate for this reaction was calculated from our measured cross sections and was found to be significantly smaller than the theoretical rate used in previous nucleosynthesis calculations. We discuss the impact of this result on the nucleosynthesis of 36S.

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