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Fission cross-sections of235U and239Pu averaged over252Cf neutron spectrum

Authors
Journal
Annals of Nuclear Energy
0306-4549
Publisher
Elsevier
Publication Date
Volume
5
Identifiers
DOI: 10.1016/0306-4549(78)90032-4
Disciplines
  • Mathematics

Abstract

Abstract A series of measurements have been carried out to derive values for the spectrum-averaged fission cross-section of 235U and 239Pu for 252Cf fission neutrons. Two nearly identical target foils were mounted on either side of a Cf source (10 7 neutron/sec) in a compensated beam geometry. Fission fragments passing through limited solid angle apertures were recorded from each foil by solid-state track-etch techniques. The Cf neutron source strength was calibrated in manganese bath relative to the standard source NBS-II. Values of 1.215 ± 0.022 barn for 235U and 1.790 ± 0.041 barn for 239Pu were obtained for the fission cross-sections, corresponding to a ratio value of 1.473 ± 0.041.

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