Abstract
The analysis of angular and energy distributions of prompt neutrons from the thermal neutron induced fission of 233U and 235U measured recently in the WWR-M research reactor (Gatchina, Russia) have been performed. The yield of “scission” neutrons has been estimated by comparing the measured distributions with calculations within the model of emission of neutrons from completely accelerated fragments. Besides taking into account “scission” neutrons, for the best description of measured angular and energy distributions of fission neutrons, the calculation should be performed under the assumption that neutrons with a higher (7-9%) probability are emitted along the fission axis in the center-of-mass system of fission fragments.
Highlights
Up to now many theoretical and experimental works were performed to investigate the low energy nuclear fission
Since for theoretical descriptions it is usually assumed that prompt fission neutron (PFN) are emitted from the fission fragments fully accelerated in the mutual Coulomb field, a special attention deserves the question of the existence of scission neutrons emitted from fissioning nucleus during its evolution from equilibrium deformation to the scission point
The total spectrum of “scission” neutrons was defined as the difference between the reference total PFNs spectrum (GMA-approximation [3]) and model calculation
Summary
Up to now many theoretical and experimental works were performed to investigate the low energy nuclear fission. The search for scission neutrons and investigations of their properties are complicated by impossibility of discriminating in an experiment between these neutrons and neutrons emitted from the fully accelerated fission fragments These investigations can only be conducted by comparing measured distributions of the PFNs and model calculations performed by assuming that all PFNs are emitted from fully accelerated fragments. In the present report are given the results of analysis of the PFN angular and energy distributions from thermalneutron induced fission 233U and 235U measured in NRC KI - PNPI During this analysis, to calculate model PFN distributions under an assumption that all neutrons are emitted from the fully accelerated fragments, it was used a method free of any assumptions about the PFN properties analogous to those used in refs [6],[12]
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