Abstract
The thermonuclear rate of the $^{46}\mathrm{Cr}(p,\ensuremath{\gamma})^{47}\mathrm{Mn}$ reaction has been determined using a newly evaluated proton separation energy of ${S}_{p}(^{47}\mathrm{Mn})=380\ifmmode\pm\else\textpm\fi{}30\phantom{\rule{4pt}{0ex}}\mathrm{keV}$ and nuclear structure information from the mirror nucleus $^{47}\mathrm{Ti}$. The astrophysical impact of this new rate and previously available rates has been investigated through one-zone postprocessing type-I x-ray burst calculations. The present $^{46}\mathrm{Cr}(p,\ensuremath{\gamma})^{47}\mathrm{Mn}$ rate leads to a mass fraction at $A=46$ that is 60 times larger than that obtained using a statistical model rate. The new results constrain the calculated maximum and minimum mass fractions at $A=46$ and $A=48$ to be within factors of 12 and 4, respectively. Experimental studies of the level structure of $^{47}\mathrm{Mn}$ near the proton threshold are required to improve these model predictions.
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