Fission fragment mass distribution in 6,7Li + 238U reaction

The shape of the mass distribution of the fission fragments from the actinides induced by proton or neutron is known to change with the incident energy. At low energies, it shows a double humped distribution which changes slowly to a single humped distribution as energy increases. However, for a reaction involving a weakly bound projectile (i.e., 6Li + 232Th), a sharp change in the shape of the mass distribution with energy has been observed. The sharp increase in the P/V value in the fission fragment mass distribution in 6Li + 232Th reaction was concluded to be due to reduced momentum transfer caused by alpha or deuteron induced fissions