High-precision Q(EC)-value measurement of the superallowed beta(+) emitter Mg-22 and an ab initio evaluation of the A=22 isobaric triplet

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

来源：PHYSICAL REVIEW C, 2017, 96(5): 052501.

DOI：10.1103/PhysRevC.96.052501

A direct Q(EC)-value measurement of the superallowed beta(+) emitter Mg-22 was performed using TRIUMF's Ion Trap for Atomic and Nuclear Science. The direct ground-state to ground-state atomic mass difference between Mg-22 and Na-22 was determined to be Q(EC) = 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.

• 出版日期2017-11-6