Elsevier

Nuclear Physics

Volume 66, Issue 2, May 1965, Pages 401-418
Nuclear Physics

Lifetimes of excited states in Cu63, Cu65, Ni62 and Fe56 by Doppler shift attenuation measurements

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Abstract

The lifetimes of the three excited states in Cu63 and Cu65 and the first excited states in Ni62 and Fe56 have been measured by the Doppler shift attenuation method; the states were Coulomb excited using a beam of oxygen ions from a tandem accelerator. The mean lifetimes of the 0.668, 0.961 and 1.327 MeV states in Cu63 were found to be 3.3−0.4+0.5, 9.6−0.8+0.9 and 8.3−0.8+0.9 in units of 10−13 sec. Those of the 0.770, 1.114 and 1.482 MeV states in Cu65 were found to be 1.3−0.3+0.3, 5.3−4+0.5 and 7.6−1.0+1.1 in units of 10−13 sec. For the 1.172 MeV state in Ni62 and 0.845 MeV state in Fe56 the mean lifetime values obtained were 2.26−0.16+0.19 and 11.3−2.4+4.0 in units of psec. The results for the levels in the copper isotopes are compared with the predictions of the core excitation model.

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    International Atomic Energy Agency fellow. Present Address: Nuclear Physics Division, Atomic Energy Establishment, Trombay, India.

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