A multi-parameter study of LRA fission and binary fission of 235U with thermal neutrons

Abstract

Abstract The α-particle ternary fission (LRA) and the binary fission of 235 U with thermal neutrons have been studied with a multiparametric system. The aim was to get significant results ove: the whole mass range including the symmetric and the far-out asymmetric regions, where the yields are low and the contamination due to the spurious events is high. A technique has been used to eliminate the spurious events. Results are presented on the energy and the mass distributions in LRA fission and binary fission. A difference of 2.6 ±0.5 MeV is found in the mean total fission fragment kinetic energy for these two modes of fission. The α-particle probability P α (M) is calculated under certain assumptions and compared with the prompt neutron ν(M) and the prompt γ-ray Nγ(M) yield data. Results are presented on P α (R) . There exists an anti-correlation between E¯ α and E T : ∂Ē α /∂E T = -0.105±0.01, and between E¯ T and E α : ∂Ē T /∂E α = -0.45±0.06. An effort is made to explain these various results either in a quantitative or in a qualitative way.