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

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 (${\chi }_n^2$=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.

6 pages, 4 figures, submitted to Phys. Rev. C Rapid Comm

References in corpus (8)

• A sextupole ion beam guide to improve the efficiency and beam quality at IGISOL
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• Multi-particle emission in the decay of 31Ar

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• Precision mass measurements of magnesium isotopes and implications on the validity of the Isobaric Mass Multiplet Equation
• Beyond Wigner's isobaric multiplet mass equation: Effect of charge-symmetry-breaking interaction and Coulomb polarization
• Isobaric multiplet mass equation in the $A=31$ $T=3/2$ quartets