Two-proton transfer reactions on even Ni and Zn isotopes

Abstract

New levels strongly excited by 112-MeV $^{12}\mathrm{C}$ ions on even Ni and Zn isotopes are ${\mathit{J}}^{\mathrm{\ensuremath{\pi}}}$ assigned on kinematical and geometrical arguments, crude shell-model calculations, and distorted-wave Born approximation angular-distribution analysis. These tentative assignments are supported by the Bansal-French model. Because of the contribution of additional collective effects, the two-proton transfer reaction spectra are less selectively fed than those obtained with the analogous two-neutron transfer reactions induced on the same targets in a similar energy range.