G factor of the 59/2 - isomer in Gd147

Abstract

The g factor of the 10 995 keV, Je=(59/2-, and T1/2=0.8 ns level in Gd147 has been determined by the transient field method for ions recoiling through a magnetized Gd foil at a temperature of 100 K. The Ge76(76Ge,5n)147Gd reaction at E(76Ge)=310 MeV was used to provide high recoil velocity. A 100 ps flight time in vacuum between the target and the ferromagnet of 100 ps ensured that the -ray cascades fed the (59/2 level before the recoil ions traversed the Gd foil. The g factor was extracted from standard double ratios with the known parametrization of the transient field, yielding g=0.38(7). This value is in agreement with the predicted wave function and experimental single-particle moments in this mass region. Results for levels in 146,148Gd were also obtained

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