Sub-Coulomb Resonances in theC12-C12System through the ReactionC12(C12,O16)Be8

Abstract

The excitation functions of the reaction ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$(${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$(g.s.)) ${}_{}{}^8{}_{}{}^{}\mathrm{Be}$(g.s.) were measured at 35° lab (∼90° c.m.) and at 20° lab (∼50° c.m.) near and above the Coulomb barrier ($5.75<~E_{\mathrm{c}.\mathrm{m}.\mathrm{}}<~8.9$ MeV). Resonant structures were found at 5.94, 6.35, 6.69, 8.0, and 8.4 MeV. These resonant structures were correlated with those in the elastic channel. The angular distributions at 6.4, 6.65, and 8.0 MeV were measured, and the spin-parity assignments are $2^{+}$, $2^{+}$, and $4^{+}$, respectively. The oxygen partial width at 5.94 MeV was determined to be 14 keV, which is as large as the carbon partial width.