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

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arxiv 2207.05818 v1 pith:235Y7NFV submitted 2022-07-12 nucl-ex

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

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keywords massprocessmeasurementprecisionratealphaatomicbursts
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We report a high precision mass measurement of $^{24}{\rm Si}$, performed with the LEBIT facility at the National Superconducting Cyclotron Laboratory. The atomic mass excess, $10\;753.8$(37) keV, is a factor of 5 more precise than previous results. This substantially reduces the uncertainty of the $^{23}{\rm Al}(p,\gamma)^{24}{\rm Si}$ 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 $^{22}{\rm Mg}$ waiting-point to a precision of 9%.

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