TRANSITION RATES DETERMINED FROM (N, N' GAMMA) MEASUREMENTS

The Doppler-shift attenuation method following the inelastic neutron scattering reaction (DSAM-INS) has been shown to work well for measuring the lifetimes of nuclei in different mass regions and in differing chemical environments. With the DSAM-INS, many ground-state transitions are observed with large dipole strength near 4 MeV excitation energy in N = 82 nuclei. The summed strengths are comparable to those obtained for deformed rare earth nuclei. Data obtained on Dy-164 indicates longer lifetimes than previously measured for three 1(+) levels, thus decreasing the summed B(M1)up arrow strength and making it comparable to that observed in the neighboring nuclei.