Abstract:
Angular distributions for π+ and π- elastic and inelastic scattering from the Z=28 closed-proton-shell nuclei 58,50,62,64Ni have been measured at an incident pion kinetic energy of 180 MeV. Values for the neutron and proton matrix elements for the transition to the Jπ=2+1 state have been extracted using the distorted wave impulse approximation in which the π+ and π- data were fitted simultaneously and the neutron and proton vibrational transition strengths were treated as free parameters. While all transitions are predominantly collective, extracted values of M n|Mp indicate increasing collectivity as a function of neutron number and are consistent with the collective limit of N|Z for 64Ni.
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