NANOSECOND ISOMERIC TRANSITIONS IN 89-NEUTRON NUCLEUS 153GD

In 153Tb decay, the half-lives of the excited states at 41.6 keV and 129.2 keV in 153Gd have been determined as T 1 2(41.6 keV) = 4.1 ±0.1 ns and T 1 2(129.2 keV) = 2.50±0.15 ns. Nilsson characteristics for some levels are suggested. Comparisons to Nilsson and Weisskopf estimations for γ-ray transition probabilities are performed. Conclusions about the 153Gd level structure are drawn. © 1969.