Excited States inP29from the Scattering of Protons bySi28

Abstract

Excited states in ${\mathrm{P}}^{29}$ have been observed by measuring the differential elastic scattering cross section of ${\mathrm{Si}}^{28}(p, p){\mathrm{Si}}^{28}$ for proton energies from 2.0 to 5.0 Mev and the differential inelastic scattering cross section of ${\mathrm{Si}}^{28}(p, p^{\prime }){\mathrm{Si}}^{28*}$ ($Q=-1.78\mathrm{}$ Mev) for proton energies from 3.0 to 5.2 Mev. Resonances were observed at 2.080, 2.88, 3.095, 3.334, 3.571, 3.710, 3.98, 4.235, 4.36, 4.43, and 4.884 Mev, corresponding to excited states in ${\mathrm{P}}^{29}$ at 4.732, 5.50, 5.711, 5.942, 6.171, 6.305, 6.57, 6.812, 6.93, 7.00, and 7.438 Mev, respectively. Single-level dispersion theory analysis indicates assignments $J^{\pi }={\frac{1}{2}}^{+}, {\frac{1}{2}}^{-}, {\frac{5}{2}}^{-}, {\frac{3}{2}}^{+}, {\frac{3}{2}}^{-}, {\frac{1}{2}}^{-}, {\frac{1}{2}}^{+}, {\frac{3}{2}}^{+}, {\frac{1}{2}}^{+}, {\frac{1}{2}}^{-}, \mathrm{and} {\frac{5}{2}}^{-}$, respectively, for these states.