Remeasurement of the lifetime of the 4 1 + -state of156Gd and recalculation of itsg-factor

Abstract

The half-life of the 4+-state of 156Gd has been remeasured by the delayed coincidence technique. The excellent time resolution which can now be achieved by use of small BaF2 detectors allows a more reliable determination than with previously applied methods. The result T1/2 (156Gd, 4+)= 108 (2) ps is smaller than previously published data, but it fits well into the systematics of the B (E 2) values of the rotational transitions of this nucleus. A recalculation of the previously measured g-factor of the same state gives g (156Gd, 4 +) = 0.327(19). This value is still smaller than the g-factor of the 2~ state, but the magnitude of the reduction can now easier be interpreted by nuclear structure calculations.