Constraints on the ${}^{22}Ne(\alpha ,n{)}^{25}$Mg s-process neutron source from analysis of ${}^{nat}Mg+n$ total and ${}^{25}Mg(n,\gamma )$ cross sections

Abstract

I have analyzed previously reported ${}^{\text{nat}}$Mg+\textit{n%} total and ${}^{25}$Mg(\textit{n},$\gamma$) cross sections to obtain a much improved set of resonance parameters for states in ${}^{26}$Mg between threshold and the lowest observed ${}^{22}$Ne($\alpha$,\textit{n})${}^{25}$Mg resonance, and an improved estimate of the uncertainty in the ${}^{22}$Ne(,\textit{n})${}^{25}$Mg reaction rate. For example, definitely two, and very likely at least four, of the states in this region have natural parity and hence can contribute to the ${}^{22}$Ne($\alpha$,\textit{n})${}^{25}$% Mg reaction, but two others definitely have non-natural parity and so can be eliminated from consideration. As a result, a recent evaluation in which it was assumed that only one of these states has natural parity has underestimated the reaction rate uncertainty by at least a factor of ten, whereas evaluations that assumed all these states could contribute probably have overestimated the uncertainty.

Accepted for publication in Phys. Rev. C

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