Lifetimes And Electromagnetic Transition Strength In Dy-157

Excited states in Dy-157 have been studied by gamma-gamma coincidence measurements via the reaction Sn-124(S-36, 3n) at a beam energy of 155MeV. Lifetimes of the relatively lower-spin states in Dy-157 were measured by means of the Recoil Distance Dopplershift technique in the coincidence mode. The experiment was performed at the Laboratori Nazionali di Legnaro with the GASP array and the Cologne plunger device. With the same setup a Dopplershift attenuation (DSA) lifetime measurement was performed for the higher spin states. The Differential decay-curve method was applied for the lifetime determination.