Doppler-shift attenuation measurements following the inelastic neutron scattering reaction have been employed to determine the lifetimes of a large number of states in ${}_{}{}^{146}{}_{}{}^{}\mathrm{Nd}$, and many fast $E1\mathrm{}$ transitions have been identified. From an examination of this new information and similar data for two $N=82\mathrm{}$ nuclei, ambiguities in determining the degree of nuclear collectivity from reduced $E1\mathrm{}$ transition rates are illustrated.

• Received 23 August 1995

DOI:https://doi.org/10.1103/PhysRevC.52.R2831