Differential cross sections were measured for the ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$(n,n’γ) reactions at incident energies between 4.8 and 8.0 MeV. Excitation energies, spins, level lifetimes, γ-ray branching ratios, and γ-ray production cross sections were determined. Members of the doublet at 4.50 MeV are clearly identified and assigned spins of $4^{+}$ and $3^{\mathrm{-}}$. Inelastic neutron scattering cross sections were inferred from the γ-ray branching ratios and production cross sections. The inferred cross sections are in excellent agreement with those measured in a separate neutron detection experiment, and with a recent vibrational model coupled-channels analysis of the ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$(n,n’) data. Comparison of level excitations produced by neutrons and other hadrons with electomagnetic strengths shows very different mixtures of neutron and proton particle-hole amplitudes for different levels.

• Received 16 April 1991

DOI:https://doi.org/10.1103/PhysRevC.45.1628