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. Wieser, J. Dilling

Research output: Contribution to journalArticlepeer-review

Abstract

A direct QEC-value measurement of the superallowed β+ emitter 22Mg was performed using TRIUMF’s Ion Trap for Atomic and Nuclear science (TITAN). 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 towards calculating superallowed isospin-symmetry-breaking (ISB) corrections from first principles, ab-initio shell-model calculations of the A = 22 IMME 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)
JournalUnknown Journal
StatePublished - Aug 1 2017
Externally publishedYes

ASJC Scopus subject areas

  • General

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