Abstract
The decay of 161Tb has been studied using a high-resolution Ge(Li) detector. Five new transitions were observed and fitted into the earlier proposed decay scheme. The half-life of the 131.8keV level in 161Dy was determined in a delayed-coincidence measurement to be 145 ±15 psec. The low level scheme in 161Dy is discussed within a quasiparticle model allowing for Coriolis mixing. Special attention is given to the strongly retarded, K-allowed 131.8 keV El transition with a retardation factor F W > 1.5 × 10 8.
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