Measurement of g-factors of several short lived nuclear states in odd-mass nuclei

Abstract

The g-factors of several excited states have been measured by observing the rotation of the angular correlation of γ-γ cascades by an applied magnetic field. The results are: 280-keV state of As 75( τ = 3.4 × 10 −10 sec) g = 0.42±0.13, 114-keV state of Lu 175 ( τ = 9.4 × 10 −11 sec) g = 0.5±0.2 and 113-keV state of Hf 117 (τ = 6 × 10 −10 sec g =0.22 × 0.06. these results are compared with the theoretical predictions of the Nilsson model are in good agreement. For the case of As 75 other relevant properties are also compared with the model predictions. The results indicate that the model can be usefully applied to As 75 and that the nucleus has a prolate deformation (ν ≈ 2.5). The g-factor of the 91-keV level of Pm 147 has also been studied, a definite rotation of the angular correlation being observed. Computation of the g-factor from the observed data is uncertain because the time dependent attenuation of the γ-γ correlation is not known. The results are g = (0.9±0.2)/ G 2. The effect of the paramagnetic nature of the rare earth ions on such measurements on this group of nuclei is discussed as an appendix. Other assumptions made in deducing the g-factors from the observed rotations of the angular correlations are also discussed in the paper.