Inelastic Proton Scattering from Phosphorus and Zinc

Inelastic proton spectra from targets containing phosphorus and zinc have been studied at bombarding energies of 3.72 and 4.66 Mev using a double-focusing spectrometer. Proton groups have been observed corresponding to levels in ${\mathrm{P}}^{31}$ at 1.264±0.004, 2.230±0.005, 3.134±0.006, and 3.292±0.005 Mev. Excitation curves for these four inelastic groups measured in the region of $E_p=4.55\mathrm{} \mathrm{to} 4.70$ Mev show the same general resonant structure, although differing in detail. At $E_p=4.66\mathrm{}$ Mev, no additional groups from ${\mathrm{P}}^{31}$ were observed for the excitation region 0 to 1.26 Mev with an intensity greater than 2% of the intensity of the first excited state group.