Excitation energies and strengths of sixty-eight resonances in the compound nucleus ${}_{}{}^{31}{}_{}{}^{}\mathrm{P}$ formed by the reaction ${}_{}{}^{30}{}_{}{}^{}\mathrm{Si}$($p$,$\alpha$)${}_{}{}^{27}{}_{}{}^{}\mathrm{Al}$ were observed in the energy range $E_p=4.90-6.08\mathrm{}$ MeV. The natural widths of eighteen resonances are reported. The observed level density has been found in good agreement with a semiempirical theory. Angular distributions of ground-state alpha particles, measured at nine resonances, suggested spin and parity for eight levels and level-interference effect for one level.

NUCLEAR REACTIONS ${}_{}{}^{30}{}_{}{}^{}\mathrm{Si}$($p$,$\alpha$), $E=4.90-6.08\mathrm{}$ MeV; measured $\sigma (E;E_{\alpha },\theta )$, ${}_{}{}^{31}{}_{}{}^{}\mathrm{P}$; deduced levels, $J$, $\pi$, orbital momentum mixing ratios; enriched target.

• Received 27 May 1981

DOI:https://doi.org/10.1103/PhysRevC.25.1751