Using the generalized optical theorem for charged particles, the total reaction cross section ${\sigma }_R$ and the nuclear scattering amplitude $f_N$ at $0°$ have been determined model independently for the first time in the ${}^6\mathrm{He}{+}^{12}\mathrm{C}$ system. A large fraction of ${\sigma }_R$ is accounted for by $f_N\left(0\mathrm{}°\right)$ — a manifestation of the nuclear forward glory effect. A comparison with the ${}^6\mathrm{Li}{+}^{12}\mathrm{C}$ system supports the prediction that the high break-up probability of ${}^6\mathrm{He}$ reduces the fraction of the total reaction cross section accounted for by the nuclear scattering amplitude at $0°.$

• Received 1 April 1999

DOI:https://doi.org/10.1103/PhysRevC.60.064603