The emission of Long-Range α-particles in the thermal neurtron induced fission of233U,235U,and239Pu

The yields of the long-range α-particles (LRA) in the thermal neutron induced fission 0f²³³U,²³⁵U, and²³⁹Pu have been determined relative to the corresponding binary fiassion yield. The measurements were performed with surface harrier detectors on a thermalized reactor beam. We obtained for²³³U,²³⁵U and²³⁹Pu binary-to-LRA ratios the values 485±20 respectively 615±20, 475±20. Some of the discrepancies between the published data were explained and experimental indications for²³⁵U(n, α)- and²³⁹Pu(n, α)-reactions are present. Finally the LRA-yield was correlated with some other fission characteristics.