High-precision mass measurement of ${}^{24}$Si and a refined determination of the $rp$ process at the $A=22$ waiting point

Abstract

We report a high precision mass measurement of ${}^{24}\mathrm{Si}$, performed with the LEBIT facility at the National Superconducting Cyclotron Laboratory. The atomic mass excess, $10753.8$(37) keV, is a factor of 5 more precise than previous results. This substantially reduces the uncertainty of the ${}^{23}\mathrm{Al}(p,\gamma {)}^{24}\mathrm{Si}$ reaction rate, which is a key part of the rapid proton capture ($rp$) process powering Type I X-ray bursts. The updated rate constrains the onset temperature of the $(\alpha ,p)$ process at the ${}^{22}\mathrm{Mg}$ waiting-point to a precision of 9%.

6 pages, 3 figures

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Cited by in corpus (2)

• Study of the ${}^{22}$Mg waiting point relevant for x-ray burst nucleosynthesis via the ${}^{22}$Mg($\alpha$,$p$)${}^{25}$Al reaction
• The 2025 Evaluation of Experimental Thermonuclear Reaction Rates (ETR25)