Fission probability distributions of ${}_{}{}^{236}{}_{}{}^{}\mathrm{U}$ and ${}_{}{}^{240}{}_{}{}^{}\mathrm{Pu}$ compound systems have been measured with the (${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^8{}_{}{}^{}\mathrm{Be}_{\mathrm{g}.\mathrm{s}.\mathrm{}}^{}{}_{}{}^{}$) reaction in the excitation energy range of 7-16 MeV using 65 MeV projectiles. Identification of ${}_{}{}^8{}_{}{}^{}\mathrm{Be}_{\mathrm{g}.\mathrm{s}.\mathrm{}}^{}{}_{}{}^{}$ as two highly correlated alpha particles showed that under the conditions of this experiment ${}_{}{}^8{}_{}{}^{}\mathrm{Be}_{\mathrm{g}.\mathrm{s}.\mathrm{}}^{}{}_{}{}^{}$ can be separated from ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ in a simple $\Delta E-E$ system. The results are in good agreement with fission probabilities derived from neutron induced fission of ${}_{}{}^{235}{}_{}{}^{}\mathrm{U}$ and ${}_{}{}^{239}{}_{}{}^{}\mathrm{Pu}$.

[NUCLEAR REACTIONS, FISSION Measured fission probabilities for ${}_{}{}^{236}{}_{}{}^{}\mathrm{U}$ and ${}_{}{}^{240}{}_{}{}^{}\mathrm{Pu}$ with (${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^8{}_{}{}^{}\mathrm{Be}_{\mathrm{g}.\mathrm{s}.\mathrm{}}^{}{}_{}{}^{}$) reaction.]

• Received 23 September 1980

DOI:https://doi.org/10.1103/PhysRevC.24.519