Excited States inN14from the Elastic Scattering of Protons byC13

Abstract

Excited states in ${\mathrm{N}}^{14}$ have been observed by measuring the differential elastic scattering cross section of ${\mathrm{C}}^{13}(p, p){\mathrm{C}}^{13}$ for proton energies from 2.6 to 5.0 Mev. Resonances were observed at proton energies of 2.743, 2.87, 3.105, 3.20, 3.78, 3.980, 4.04, and 4.14 Mev, corresponding to excited states in ${\mathrm{N}}^{14}$ at 10.092, 10.21, 10.428, 10.52, 11.05, 11.240, 11.30, and 11.39 Mev, respectively. Single-level dispersion theory analysis indicates assignments $J^{\pi }=1^{+}\left(2^{+}\right), 1^{-}, 2^{+}, 1^{-}, 1^{+}, 3^{-}, 2^{-}, \mathrm{and} 1^{+}$, respectively, for these states. Analysis of previously published ${\mathrm{C}}^{13}(p, p){\mathrm{C}}^{13}$ data at lower energies confirms the assignments $1^{-}$, $0^{+}$, $0^{-}$, $3^{-}$, and $1^{+}$ for the states at 8.05, 8.61, 8.75, 8.90, and 8.98 Mev. A resonance at 4.265 Mev corresponding to the known narrow state at 11.504 Mev was not found in the elastic scattering data although it was found to be strong in ${\mathrm{C}}^{13}(p, p^{\prime }){\mathrm{C}}^{13*}$.