Half-life, branching-ratio, and Q-value measurement for the superallowed 0+→0+β+ emitter Ti42

The half-life, the branching ratio, and the decay Q value of the superallowed β emitter Ti42 were measured in an experiment performed at the JYFLTRAP facility of the Accelerator Laboratory of the University of Jyväskylä. Ti42 is the heaviest T_z=-1 nucleus for which high-precision measurements of these quantities have been tried. The half-life (T_1/2=208.14±0.45 ms) and the Q value [Q_EC=7016.83(25) keV] are close to or reach the required precision of about 0.1%. The branching ratio for the superallowed decay branch [BR=47.7(12)%], a by-product of the half-life measurement, does not reach the necessary precision yet. Nonetheless, these results allow one to determine the experimental ft value and the corrected Ft value to be 3114(79) and 3122(79) s, respectively.