Abstract
Differential cross sections have been measured for both elastic and inelastic scattering of 25 MeV alpha particles from 58,60,62,64Ni nuclei. An increasing neutron skin thickness in the isotopic sequence from 58Ni to 64Ni has been found. The angular distributions of excited states have been analysed by the coupled-channel (CC) approximation, in the context of the vibrational model. The analysis reveals enhanced hexadecapole (0+ to 4+) transitions in 58,60,64Ni. Deformation parameters for the excited states have been deduced. Isoscalar transition rates have been extracted and compared with electromagnetic transition rates.
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