Excited levels in ${\mathrm{P}}^{29}$ have been observed as resonances in the differential elastic and inelastic scattering cross sections for protons incident upon natural silicon (92.2% ${\mathrm{Si}}^{28}$) at proton energies from 4.8 to 7.0 MeV. Resonances corresponding to twenty-three levels in ${\mathrm{P}}^{29}$ from 7.4- to 9.5-MeV excitation were observed. The orbital angular momenta of the incident protons were determined for most of the resonances, using single-level dispersion theory.

• Received 26 March 1962

DOI:https://doi.org/10.1103/PhysRev.127.947