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


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Abstract

An experiment devoted to studying neutron–neutron angular correlations in the slow-neutroninduced fission of 233U, 235U and 239Pu 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.

About the authors

I. S. Guseva

Petersburg Nuclear Physics Institute

Author for correspondence.
Email: guseva_is@pnpi.nrcki.ru
Russian Federation, Gatchina, 188300

A. M. Gagarski

Petersburg Nuclear Physics Institute

Email: guseva_is@pnpi.nrcki.ru
Russian Federation, Gatchina, 188300

V. E. Sokolov

Petersburg Nuclear Physics Institute

Email: guseva_is@pnpi.nrcki.ru
Russian Federation, Gatchina, 188300

G. A. Petrov

Petersburg Nuclear Physics Institute

Email: guseva_is@pnpi.nrcki.ru
Russian Federation, Gatchina, 188300

A. S. Vorobyev

Petersburg Nuclear Physics Institute

Email: guseva_is@pnpi.nrcki.ru
Russian Federation, Gatchina, 188300

G. V. Val’sky

Petersburg Nuclear Physics Institute

Email: guseva_is@pnpi.nrcki.ru
Russian Federation, Gatchina, 188300

T. A. Zavarukhina

Petersburg Nuclear Physics Institute

Email: guseva_is@pnpi.nrcki.ru
Russian Federation, Gatchina, 188300

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