Sources of (Pm148)2O3 and (Eu152)2O3, moving at the high linear velocities available with ultracentrifuges, provided the resonant gamma radiation for the excitation of the 1.46-MeV 1- level in Sm148 and the 0.96-MeV 1-level in Sm152. The partial width Γ0 for the 0.96-MeV E1 ground-state transition in Sm152 was determined in a self-absorption experiment as Γ0=(7.3+/-0.6)×10-3 eV. With a branching ratio Γ0.96Γ0.84=0.77, this leads to a mean life τlevel(0.96 MeV)=(3.9+/-0.4)×10- 14 sec. The scattering data from Sm148 were analyzed, using slowing-down information obtained from a study of the shape of the 0.96-MeV Sm152 emission line, and a mean life τlevel(1.46 MeV)=(1.4- 0.3+0.6)×10-13 sec was obtained. These results show that the E1 transitions from the 1- states in Sm148 and Sm152 are considerably retarded, the retardation for the transitions in the spherical nucleus Sm148 being almost 1 order of magnitude larger than that for the E1 transitions in the deformed nucleus Sm152.