Phase-integral calculation of phase shifts for a heavy-ion optical potential

Phase shifts for an optical potential representing the nuclear scattering of ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$ by ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$ at 60 MeV laboratory energy are calculated by means of an arbitrary-order phase-integral formula taking account of two turning points. The results are found to be in excellent agreement with previously published numerical calculations.