β-decay Q values among the A = 50 Ti-V-Cr isobaric triplet and atomic masses of ~(46,47,49,50)Ti, ~(50,51)V, and ~ (50,52–54)Cr

摘要

Using high-precision Penning trap mass spectrometry at the Low Energy Beam and Ion Trap facility at the National Superconducting Cyclotron Laboratory we have measured the Q values of the fourth-order forbidden β decay and electron capture of ~(50)V and the double electron capture Q value of ~ (50)Cr with the results Q_β (~(50) V) = 1038.1(1) keV, Q_(EC)(~(50)V) = 2208.7(1) keV, and Q2EC(~(50)Cr) = 1170.5(1) keV. In addition, we have measured the atomic masses of ~(46,47,49,50)Ti, ~(50,51)V, and ~(50,52–54)Cr, reducing uncertainties by factors of up to three compared with the most recent atomic mass evaluation (AME2016) [Chin. Phys. C 41, 030003 (2017)]. Our results are in good agreement with AME2016 for ~(46,47,49,50)Ti and ~(50,54)Cr and show deviations of up to ～1 keV (2.5σ) for ~ (50,51)V and ~(50,54)Cr.