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arXiv · 1511.08024

Mass of astrophysically relevant $^{31}$Cl and the breakdown of the isobaric multiplet mass equation

A. Kankainen·L. Canete·T. Eronen·J. Hakala·A. Jokinen·J. Koponen·I. D. Moore·D. Nesterenko·J. Reinikainen·S. Rinta-Antila·A. Voss·J. Äystö
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Abstract

The mass of $^{31}$Cl has been measured with the JYFLTRAP double Penning trap mass spectrometer at the Ion-Guide Isotope Separator On-Line (IGISOL) facility. The determined mass-excess value, -7034.7(34) keV, is 15 times more precise than in the Atomic Mass Evaluation 2012. The quadratic form of the isobaric multiplet mass equation for the T=3/2 quartet at A=31 fails ($χ^2_n$=11.6) and a non-zero cubic term, d=-3.5(11) keV, is obtained when the new mass value is adopted. $^{31}$Cl has been found to be less proton-bound with a proton separation energy of $S_p$=265(4) keV. Energies for the excited states in $^{31}$Cl and the photodisintegration rate on $^{31}$Cl have been determined with significantly improved precision using the new $S_p$ value. The improved photodisintegration rate helps to constrain astrophysical conditions where $^{30}$S can act as a waiting point in the rapid proton capture process in type I x-ray bursts.

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A. Kankainen, L. Canete, T. Eronen, J. Hakala, A. Jokinen, J. Koponen, I. D. Moore, D. Nesterenko, J. Reinikainen, S. Rinta-Antila, A. Voss, J. Äystö. 2016-01-27. Mass of astrophysically relevant $^{31}$Cl and the breakdown of the isobaric multiplet mass equation. https://doi.org/10.1103/physrevc.93.041304

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