Angular distributions of the cross section for the elastic and inelastic scattering of protons have been measured at four isobaric analog resonances of the ${}_{}{}^{144}{}_{}{}^{}\mathrm{Sm}$+p system and at two off-resonance energies. Spectroscopic information about the ${\frac{7}{2}}_1^{-},{\frac{3}{2}}_1^{-},{\frac{1}{2}}_1^{-}, \mathrm{and} {\frac{5}{2}}_1^{-}$ states of the parent nucleus ${}_{}{}^{145}{}_{}{}^{}\mathrm{Sm}$ is extracted, with the core ${}_{}{}^{144}{}_{}{}^{}\mathrm{Sm}$ in the states $0_1^{+},2_1^{+},3_1^{-},4_1^{+}, \mathrm{and} 2_2^{+}$. The analysis includes direct and fluctuating nonresonant processes. The direct scattering amplitude is obtained from a coupled channel treatment. Different methods for the calculations of the single-particle widths have been employed. The experimental spectroscopic amplitudes were compared with nuclear structure calculations based on the particle-vibrator model. Both the liquid drop model and the quasi-particle random phase approximation were used to describe the vibrator. The calculations based on the latter model show good agreement with the experimental results.

[NUCLEAR REACTIONS ${}_{}{}^{144}{}_{}{}^{}\mathrm{Sm}$(p,p′), $E=8.5-14\mathrm{}$ MeV, enriched targets, measured $\sigma (E_{\mathrm{p}},\theta )$; experimental and theoretical ${}_{}{}^{145}{}_{}{}^{}\mathrm{Sm}$ spectroscopic amplitudes.]

• Received 14 September 1982

DOI:https://doi.org/10.1103/PhysRevC.29.49