The reactions ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}(p, pn){}_{}{}^{39}{}_{}{}^{}\mathrm{Ca}$ and ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}(p, pn){}_{}{}^{47}{}_{}{}^{}\mathrm{Ca}$ were studied at 149.5 MeV in coplanar geometries. An overall separation energy resolution of about 1 MeV was achieved. Probable neutron-hole strength is seen for $1d_{\frac{5}{2}}$ and $1p$ shell knockout from both targets. The data are compared with distorted-wave-impulse-approximation calculations and spectroscopic factors are extracted for neutron-hole states.

NUCLEAR REACTIONS ${}_{}{}^{40,48}{}_{}{}^{}\mathrm{Ca}(p, pn){}_{}{}^{39,47}{}_{}{}^{}\mathrm{Ca}$, $E=149.5\mathrm{}$ MeV; measured $p-n$ coincidences; extracted neutron separation energy spectra and cross sections $\frac{d^3\sigma }{d{\Omega }_{n}d{\Omega }_{p}d{E}_p}$ for neutron-hole states. Compared cross sections with distorted-wave-impulse-approximation calculations; extracted spectroscopic factors $C^{2}S$ for neutron-hole states.

• Received 11 March 1982

DOI:https://doi.org/10.1103/PhysRevC.26.961