Observation of a strong correlation between g(2+ γvib) and g(2+ rot) in strongly deformed nuclei

The E2/M1 multipole mixing parameters of cascade transitions in γ-vibrational bands of 154Gd, 166Er and 168Er have been determined by γ -@#@ γ directional correlation measurements as: \(\delta \left( {{}^{154}{\text{Gd}}\left( {3_\gamma ^ + \to 2_\gamma ^ + } \right)} \right) = - 4.3_{ - 2.1}^{ + 9.4}\) and \(\delta \left( {{}^{166}{\text{Er}}\left( {5_\gamma ^ + \to 4_\gamma ^ + } \right)} \right) = + 1.94_{ - 0.21}^{ + 0.23}\) (with conversion data [15] taken into account) These data were used to derive g(2+γvib) − g(2+ rot). The results, together with g-factors derived from direct measurements by IPAC and Mossbuer spectroscopy [10] or by use of transient fields [9, 31] exhibit a strong correlation between both g-factors, i.e. if g(2+ rot) is large g(2+ γvib) is small and vice versa. The most direct and most simple interpretation is the assumption of a more or less different density distribution of protons and neutrons in the nuclei.