KilovoltS33(n, α0)andS33(n, γ)cross sections: Importance in the nucleosynthesis of the rare nucleusS36

The ${}_{}{}^{33}{}_{}{}^{}\mathrm{S}(n, {\alpha }_0)$ and ${}_{}{}^{33}{}_{}{}^{}\mathrm{S}(n, \gamma )$ cross sections have been measured from ∼10 to ∼700 keV. Resonance parameters are given for 39 resonances. The level spacing is determined to be 9.1±0.9 keV. The $\sigma (n, {\alpha }_0)$ and $\sigma (n, \gamma )$ cross sections are averaged over a Maxwellian distribution for values of $\mathrm{kT}$ from 25 to 275 keV. When these cross sections are used in a nucleosynthesis calculation of the rare isotope ${}_{}{}^{36}{}_{}{}^{}\mathrm{S}$, the overproduction of this isotope, relative to the other nuclei formed in the universe, is reduced from a factor of 10 to 2.5.