Abstract

The quadrupole moment of the highly deformed band built upon the ${\mathit{i}}_{13/2}$ neutron intruder orbital in $^{135}\mathrm{Sm}$ has been measured, using the Doppler shift attenuation method and Braune stopping powers, to be 7.0\ifmmode\pm\else\textpm\fi{}0.7 e b. These data provide strong evidence that this high-j, N=6 intruder orbital is responsible for the highly deformed states seen in this region. The result is compared to total Routhian surface calculations. A possible explanation for the observed anomalous behavior of the ${\mathit{J}}^{(2)}$ moment of inertia in this nucleus is discussed in terms of quenched static proton pair correlations.

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