FISSION CROSS SECTIONS OF U$sup 233$, U$sup 235$, AND Pu$sup 239$ IN THE NEUTRON ENERGY FROM 0.3 to 2.5 Mev

Journal Article · Mon Oct 01 00:00:00 EDT 1962 · At. Energ. (USSR)

OSTI ID:4770767

Smirenkin, G N; Nesterov, V G; Bondarenko, I I

Marked irregularities were noted in the energy dependence of the angular anisotropy in the case of the fission of U/sup 233/, U/sup 235/, and Pu/sup 239/. Studies were made for detecting the existence of similar effects in the fission cross sections involving the direct effect of neutrons. The measurements were carried out by means of a Van de Graaff generator in the energy range from 0.3 to 2.5 Mev, making use of the neutrons, together with solid tritiated targets, while a double ionization chamber provided with an electronic selector served as the fission fragment detector. The layers containing about 1.5 mg/cm/sup 2/ of oxides of U and Pu were placed perpendicularly to the direction of the proton beam. The fission cross functions of the three isotopes represent the basic features of the energy dependence of fissionability, determined by the (d,p) reaction (V. G. Nesterov et al., Atomn, Energ., 11: 248 (1961) No. 3). A clear- cut correlation between the fission cross section and angular anisotropy could be observed only for U/sup 233/ and Pu in the energy range of <1.5 Mev and not at all for U/sup 235/. (TTT)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-17-002266
• OSTI ID: 4770767
• Journal Information: At. Energ. (USSR), Journal Name: At. Energ. (USSR) Vol. Vol: 13
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

ANGULAR DISTRIBUTION
ANISOTROPY
CROSS SECTIONS
DEUTERONS
ELECTRONIC EQUIPMENT
ENERGY RANGE
FISSION
FISSION PRODUCTS
HELIUM 3
IONIZATION CHAMBERS
ISOTOPES
LAYERS
MEASURED VALUES
MEV RANGE
NEUTRON BEAMS
NUCLEAR REACTIONS
PHYSICS
PLUTONIUM 239
PLUTONIUM OXIDES
PROTON BEAMS
RADIATION DETECTORS
TARGETS
TRITIUM
URANIUM 233
URANIUM 235
URANIUM OXIDES
VAN DE GRAAFF ACCELERATORS