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Mass of astrophysically relevant Cl31 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, and J. Äystö
Phys. Rev. C 93, 041304(R) – Published 22 April 2016

Abstract

The mass of Cl31 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 (χn2=11.6) and a nonzero cubic term, d=3.5(11) keV, is obtained when the new mass value is adopted. Cl31 has been found to be less proton-bound, with a proton separation energy of Sp=264.6(34) keV. Energies for the excited states in Cl31 and the photodisintegration rate on Cl31 have been determined with significantly improved precision by using the new Sp value. The improved photodisintegration rate helps to constrain astrophysical conditions where S30 can act as a waiting point in the rapid proton capture process in type-I x-ray bursts.

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  • Received 25 November 2015
  • Revised 16 March 2016

DOI:https://doi.org/10.1103/PhysRevC.93.041304

©2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

A. Kankainen1,*, L. Canete1, T. Eronen1, J. Hakala1, A. Jokinen1, J. Koponen1, I. D. Moore1, D. Nesterenko1, J. Reinikainen1, S. Rinta-Antila1, A. Voss1, and J. Äystö2

  • 1University of Jyvaskyla, P.O. Box 35, FI-40014 University of Jyvaskyla, Finland
  • 2Helsinki Institute of Physics, P.O. Box 64, FI-00014 University of Helsinki, Finland

  • *anu.kankainen@jyu.fi

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Vol. 93, Iss. 4 — April 2016

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