Abstract
Lifetime measurements were performed in the ns range in the spherical nuclei ( 95Mo, 99Tc, 141Pr), spheroidal odd-mass nuclei ( 153Eu, 161Dy, 175Lu, 181Ta) and spheroidal even-mass nuclei ( 156Gd, 160Dy, 170Yd, 182W), using delayed coincidences. Total conversion coefficients for 2 + → 0 + rotational transitions calculated from lifetime and Coulomb excitation data agree with the theoretical values within 5% on the average. No striking evidence of a change in the equilibrium shape of the 153Eu nucleus in the 97 keV state could be found. The ground state of 156Eu is ascribed to the configuration 0 +( p 5 2 +[413], n 5 2 +[642]) . In 175Lu different values for the lifetime of the 343 keV level resulted from delayed coincidences and resonance fluorescence measurements. A discussion of the influence of high-energy transitions in 182W shows that earlier measurements gave too large values for the lifetime of the 1290 keV level. RADIOACTIVITY 95Tc, 99Mo, 141Ce, 153Sm, 153Gd, 156Eu, 160Tb, 161Tb, 170Tm, 175Hf, 181Hf, 182Ta; measured βψ−, ψψ−, ψce-delay. Deduced cc. 95Mo, 99Tc, 141Pr, 153Eu, 156Gd, 160, 161Dy, 170Yb, 175Lu, 181Ta, 182W levels; deduced T 1 2 J, π. Natural targets.
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