Inelastic Scattering of 28. 5 MeV Alpha Particles by 60Ni and 62Ni

The angular distributions of alpha particles elastically and inelastically scattered by 60Ni and 62Ni have been measured at 28.5 MeV. About 40 angular distributions, which include those corre-sponding to the so-called two-phonon triplet, have been obtained. Results were analyzed in terms of the optical model and the DWBA theory. The observed cross sections for excitation of the two-phonon triplet states were compared with the predictions of the coupled channel theory, and a reasonable agreement between the experiment and the theory has been obtained. Inelastic scatterings leading to the first 2+, the first 4 * and the first 0+ states of 62Ni were analyzed using form factors of a microscopic model. The so-called two-phonon states, some possible 3- states other than the most prominent ones and possible higher spin (5-) states are discussed