High-precision QEC-value measurement of the superallowed β+ emitter 22Mg 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. E. Wieser, J. Dilling

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Abstract

A direct QEC-value measurement of the superallowed β+ emitter 22Mg was performed using TRIUMF’s Ion Trap for Atomic and Nuclear Science. The direct ground-state to ground-state atomic mass difference between 22Mg and 22Na 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-symmetrybreaking 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
JournalPhysical Review C
Volume96
Issue number5
DOIs
Publication statusPublished - 6 Nov 2017

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