Detailed Investigations of Neutron–Neutron Angular Correlations in Slow-Neutron-Induced Fission of {sup 233}U, {sup 235}U, and {sup 239}Pu

Journal Article · Sun Jul 15 04:00:00 EDT 2018 · Physics of Atomic Nuclei

DOI:https://doi.org/10.1134/S1063778818040051· OSTI ID:22761716

Gagarski, A. M.; Sokolov, V. E.; Petrov, G. A.; Vorobyev, A. S.; Val’sky, G. V.; Zavarukhina, T. A. ^[1]

---

1. National Research Center Kurchatov Institute, Petersburg Nuclear Physics Institute (Russian Federation)

An experiment devoted to studying neutron–neutron angular correlations in the slow-neutroninduced fission of {sup 233}U, {sup 235}U and {sup 239}Pu nuclei was performed. The experimentally determined angular dependence of the number of neutron–neutron coincidences was compared with the results of a Monte Carlo simulation for various values of the neutron-detection threshold in the range between 490 and 2080 keV. It was found that the experimental angular distributions in question can be described well under the assumption that 2% to 5% of all prompt fission neutrons are emitted isotropically in the laboratory frame. Probably, such neutrons can be interpreted as so-called scission neutrons directly associated with the nuclear-rupture instant. Energy distributions of this component were also obtained from the present analysis.

• OSTI ID: 22761716
• Journal Information: Physics of Atomic Nuclei, Journal Name: Physics of Atomic Nuclei Journal Issue: 4 Vol. 81; ISSN 1063-7788; ISSN PANUEO
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR CORRELATION
ANGULAR DISTRIBUTION
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
ENERGY SPECTRA
FISSION
FISSION NEUTRONS
KEV RANGE
MONTE CARLO METHOD
NEUTRON DETECTION
NEUTRON-NEUTRON INTERACTIONS
PLUTONIUM 239
RUPTURES
SLOW NEUTRONS
URANIUM 233
URANIUM 235