Elastic and inelastic scattering of alpha particles onNi58andNi60in a broad range of energy and angle

The differential cross sections for $\alpha$ particles elastically and inelastically scattered from ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$ (at 29, 34, 38, and 58 MeV) and elastically scattered from ${}_{}{}^{60}{}_{}{}^{}\mathrm{Ni}$ (at 29 and 34 MeV), are measured together with excitation functions in the 25-38 MeV region at 178.5° lab. These data together with the data of 26.5, 32.3, 104, and 139 MEV for ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$ and 32.3 and 104 MeV for ${}_{}{}^{60}{}_{}{}^{}\mathrm{Ni}$ from other sources were analyzed using an optical model with volume and surface absorptions and the Saxon-Woods square form factors. The analysis yielded energy dependent depths of both real and imaginary parts of the potential and constant geometric parameters. The analytical expressions for depths of the real and both absorption potentials are obtained. The coupled channel calculations using the above optical potential were performed for the first excited state of ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$. Both elastic scattering data and coupling with the first excited state of ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$ are well reproduced using the above potential in the wide scattering energy range.