Structure in the Radiative Capture ofC12byC12near the Coulomb Barrier

Abstract

The yield curves of high-energy capture $\gamma$ rays from ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}({}_{}{}^{12}{}_{}{}^{}\mathrm{C}, {\gamma }_0)$ and ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}({}_{}{}^{12}{}_{}{}^{}\mathrm{C}, {\gamma }_1)$ were measured at ${\theta }_{\mathrm{lab}}=45\mathrm{}°$ from $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=5.0\mathrm{} \mathrm{to} 11.0$ MeV. A $J^{\pi }=2^{+}$ resonance, with a width (full width at half-maximum) of 261±74 keV and a peak cross section at 45° of 44.3±4.5 nb/sr, was observed in ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}({}_{}{}^{12}{}_{}{}^{}\mathrm{C}, {\gamma }_0)$ at (21.98±0.03) MeV excitation in ${}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}$. Several other resonant features were also observed in the $\gamma$-ray yields.