Single-particle and single-hole spectra in 40Ca

The single-particle (sp) and single-hole spectra in 40Ca are calculated with the Paris potential by two methods: (1) the eigenvalue equation derived from the sp Green function and (2) the sp potential u/sub α//sub β/ = M/sub α//sub β/(ε/sub β/) defined in terms of the mass operator M/sub α//sub β/(ω). The energy dependence of G matrix is taken into account rigorously. Our results agree with the experimental values fairly well. It is found that the Paris potential yields a somewhat better result than the RSC potential