RADIATIVE CAPTURE CROSS-SECTIONS FOR 14.5 MeV NEUTRONS

Technical Report · Sun Dec 01 04:00:00 EST 1957

OSTI ID:4263142

Perkin, J L; O'Connor, L P; Coleman, R F

A modified version of this report, without the Appendix, was published in the Proc. Phys. Soc. 72, 505-l3 The radiative capture cross sections for;4.5-Mev neutrons were measured for some 30 nuclides selected over a widc range of the periodic table. Chcmical procedures wcre found essential to separate and identify thc resldual activities resulting from capture reactions from the activity caused by the many other competing reactions possible at this neutron energy. Errors due to capture reactions caused by the small percentage of low energy neutrons which were unavoidibly present during the irradiationss were taken into account. The cross sections found wcre of the order of 5 mb for all except the lightest of thc nuclides examined. A plot of these cross sections with respect to neutron number shows somc evidence for relatively low values for the / cross section near magic neutron numbers. These depressions are not so marked as those observed in experiments with fission spectrum neutrons. The general level of 5 mb found for radiative capture cross sections for 14.5 Mev neutrons is grossly in excess of the value predicted from some thcoretical considerations. The consequences of this disagreement are discussed. (auth)

• Research Organization: United Kingdom Atomic Energy Authority. Weapons Group. Atomic Weapons Research Establishment, Aldermaston, Berks, England
• NSA Number: NSA-13-013881
• OSTI ID: 4263142
• Report Number(s): AWRE-O-59/57
• Country of Publication: United Kingdom
• Language: English

Related Subjects

BACKGROUND
BUTYL RADICALS
CAPTURE
COMPLEXES
CROSS SECTIONS
DIAGRAMS
ENERGY RANGE
ETHERS
FAST NEUTRONS
IRRADIATION
MEASURED VALUES
NEUTRON BEAMS
NEUTRONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
PHYSICS AND MATHEMATICS
QUALITATIVE ANALYSIS
RADIOACTIVITY
REPORT
SEPARATION PROCESSES
SOLUBILITY
STABILITY
TEMPERATURE
URANYL NITRATES
WATER