Elastic and Inelastic Scattering ofαParticles and Protons fromSm144

Abstract

Differential cross sections for the elastic scattering and inelastic scattering to the low-lying states in ${}_{}{}^{144}{}_{}{}^{}\mathrm{Sm}$ have been measured using 50-MeV $\alpha$-particle and 30-MeV proton beams from the Texas A&M variable-energy cyclotron. Spin and parity assignments are checked and transition strengths measured for states at 1.66, 1.81, and 2.19 MeV. A $2^{+}$ assignment is made for a state at 2.45±0.02 MeV. The angular distributions are analyzed in the distorted-wave Born approximation, employing collective-model form factors. The present results are compared with previous experimental data and with recent theoretical calculations of the states in ${}_{}{}^{144}{}_{}{}^{}\mathrm{Sm}$.