We treat the phase shift problems of the elastic scattering of ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$+${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$ ($E_{\mathrm{lab}}=60\mathrm{}$ MeV), ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$+${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ ($E_{\mathrm{lab}}=50\mathrm{}$ MeV), and $\alpha +{}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ ($E_{\mathrm{lab}}=104\mathrm{}$ MeV) in a similar manner. We calculate the contributions to the zeroth order as well as the first order in ${\hslash }^2$. We find that the results approach the exact ones as they should.

[NUCLEAR STRUCTURE WKB method for phase shifts.]

• Received 10 February 1983

DOI:https://doi.org/10.1103/PhysRevC.29.1088