High-precision QEC -value measurement of the superallowed β+ emitter Mg 22 and an ab initio evaluation of the A=22 isobaric triplet

M. P. Reiter, K. G. Leach*, O. M. Drozdowski, S. R. Stroberg, J. D. Holt, C. Andreoiu, C. Babcock, B. Barquest, M. Brodeur, A. Finlay, M. Foster, A. T. Gallant, G. Gwinner, R. Klawitter, B. Kootte, A. A. Kwiatkowski, Y. Lan, D. Lascar, E. Leistenschneider, A. LennarzS. Paul, R. Steinbrügge, R. I. Thompson, M. Wieser, J. Dilling

*Corresponding author for this work

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4 Scopus citations

Abstract

A direct QEC-value measurement of the superallowed β+ emitter Mg22 was performed using TRIUMF's Ion Trap for Atomic and Nuclear Science. The direct ground-state to ground-state atomic mass difference between Mg22 and Na22 was determined to be QEC=4781.40(22) keV, representing the most precise single measurement of this quantity to date. In a continued push toward calculating superallowed isospin-symmetry-breaking corrections from first principles, ab initio shell-model calculations of the A=22 isobaric multiplet mass equation are also presented for the first time using the valence-space in-medium similarity renormalization group formalism. With particular starting two- and three-nucleon forces, this approach demonstrates good agreement with the experimental data.

Original languageEnglish (US)
Article number052501
JournalPhysical Review C
Volume96
Issue number5
DOIs
StatePublished - Nov 6 2017

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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