An examination of Doppler shift attenuation factors and lifetimes for excited nuclear states in 59Cu and 63Cu

Excited states in 'yCu and 63C~ have been studied with radiative proton capture. Doppler shift attenuation factors have been measured for y-rays depopulating these states, with ion recoil speeds of approximately 0.1% of the speed of light. Measurements of resonance strengths reported here, together with existing data from other techniques, have been used to deduce lifetimes for the same states. For five cases where the DSA factors and the lifetimes have been determined independently, consistency with DSAM theory is optimized when the standard energy loss value is multiplied by a factor of 0.94 f 0.11.