Neutron cross sections of thorium-232
The cross sections for neutron interactions with thorium targets were measured at several energies. Capture cross sections at 0.0253 eV and at 2 and 23.4 keV were measured by activation techniques. Transmission measurements were made from 10 to 100 eV, and capture cross sections were determined from 0.03 to 15 eV by recording discrete lines for the (n,..gamma..) spectrum. The measured thermal cross section is 7.41 +- 0.08 b, at 2 keV the cross section is 1.96 +- 0.10 b, and at 24.3 keV it is 0.540 +- 0.014 b. These values are reported relative to an assumed /sup 231/Pa branching ratio of 38.5% for the 311-keV gamma ray, and they do not include the branching ratio error. The results are fitted to R-matrix parameters. The transmission and (n,..gamma..) measurements lead to parameters that give a somewhat higher epithermal capture than previously expected in thorium. This result brings the differential data into better agreement with experiments on subcritical assemblies.
- Research Organization:
- Brookhaven National Lab., Upton, NY
- OSTI ID:
- 5404952
- Journal Information:
- Nucl. Sci. Eng.; (United States), Journal Name: Nucl. Sci. Eng.; (United States) Vol. 72:2; ISSN NSENA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
A=220 & above
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
BARYONS
BRANCHING RATIO
CAPTURE
CROSS SECTIONS
DATA
DATA FORMS
ELEMENTARY PARTICLES
ENERGY SPECTRA
EXPERIMENTAL DATA
FERMIONS
HADRON REACTIONS
HADRONS
INFORMATION
ISOLATED VALUES
MATRICES
NEUTRON REACTIONS
NEUTRONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEONS
NUMERICAL DATA
R MATRIX
SPECTRA
TARGETS
THERMAL NEUTRONS
THORIUM 232 TARGET