Electromagnetic transitions in some odd-proton deformed nuclei

Abstract

In-beam measurements of nanosecond lifetimes applying the method of delayed γ-γ coincidences were performed in the (p, n) reaction. Analysing the time spectra with the centroid shift method, the following half-lives of excited nuclear states in the subnanosecond region could be found: T 1 2 (353.2 keV in 161 Ho) = 0.52±0.15 ns , T 1 2 (252.7 keV in 161 Ho) ≦ 0.2 ns , T 1 2 (579.4 keV in 161 Ho) ≦ 0.2 ns , T 1 2 (431.2 keV in 163 Ho) = 0.37±0.15 ns , T 1 2 (439.9 keV in 163 Ho) = 0.35±0.15 ns , T 1 2 (471.3 keV in 163 Ho) ⪅ 0.2 ns , T 1 2 (612.8 keV in 163 Ho) ⪅ 0.3 ns , T 1 2 (295.6 keV in 171 Lu) = 0.85±0.20 ns , T 1 2 (469.2 keV in 171 Lu) ≦ 0.2 ns , T 1 2 (357.0 keV in 173 Lu) = 0.40±0.08 ns and T 1 2 (449.0 keV in 173 Lu) = 0.58±0.12 ns . Following half-lives in 173Lu have been remeasured: T 1 2 (425.3 keV) = 0.84±0.20 ns and T 1 2 (434.9 keV) = 0.38±0.10 ns . Absolute γ-ray transition probabilities are deduced and compared with Nilsson model predictions including pairing correlations. Coriolis mixing calculations are performed for K-allowed as well as for K-forbidden transitions.