Angular distributions of the double-differential cross section ${\mathit{d}}^2$σ/dΩ dE(σ) and the spin-flip probability ${\mathit{S}}_{\mathit{n}\mathit{n}}$ have been measured for inclusive proton inelastic scattering from ${}_{}{}^{44}{}_{}{}^{}\mathrm{Ca}$ at 290 MeV and from ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$ at 318 MeV. Excitation energies up to about 50 MeV for ${}_{}{}^{44}{}_{}{}^{}\mathrm{Ca}$ and 40 MeV for ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$ have been investigated over the laboratory angular ranges of 3° to 12° for ${}_{}{}^{44}{}_{}{}^{}\mathrm{Ca}$ and 3° to 9° for ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$. Multipole decompositions of angular distributions of both the spin-flip cross section σ${\mathit{S}}_{\mathit{n}\mathit{n}}$ and the estimated cross section for ΔS=0 transitions have been performed. Distributions of strengths were deduced for ΔL=1, ΔS=0 (the giant dipole), ΔL=2, ΔS=0 (the giant quadrupole), ΔL=0, ΔS=1 (the magnetic dipole), ΔL=1, ΔS=1 (the spin dipole), and ΔL=2, ΔS=1 (the spin quadrupole). The ΔS=0 summed strengths for ${}_{}{}^{44}{}_{}{}^{}\mathrm{Ca}$ are lower than for ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$ and ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$. The spin-dipole summed strengths are found to be approximately independent of A. For ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$, essentially all M1 strength observed was in the 10.23 MeV $1^{+}$ state; for ${}_{}{}^{44}{}_{}{}^{}\mathrm{Ca}$, M1 strength was observed to be fragmented over a range of 7 to 18 Mev.

• Received 11 March 1991

DOI:https://doi.org/10.1103/PhysRevC.44.93