Parameters of the 1. 056-eV resonance in /sup 240/Pu and the 2200 m/s neutron total cross sections of /sup 235/U, /sup 239/Pu, and /sup 240/Pu

Journal Article · Sat Aug 01 04:00:00 EDT 1987 · Nucl. Sci. Eng.; (United States)

OSTI ID:5772075

Spencer, R R; Harvey, J A; Hill, N W; Weston, L

The Bayesian method was applied to the simultaneous fitting of neutron transmission measurements on five thin and two thick samples of /sup 240/Pu to obtain the parameters of the very large resonance near 1 eV. The results of the analysis are E/sub 0/ = 1.0564 +- 0.0006 eV, GAMMA/sub ..gamma../ = 30.3 +- 0.3 meV, and GAMMA/sub n/ = 2.45 +- 0.02 meV. Some evidence in the data of a small deviation from the usual ''weak binding'' model for Doppler broadening of the theoretical resonance shape is presented. Transmission measurements on samples of /sup 235/U, /sup 239/Pu, and /sup 240/Pu also were made over the thermal energy region and their neutron total cross sections were derived. Fits of the form A..sqrt..E + B to the cross-section data in the interval from 0.02 to 0.03 eV resulted in the values 690 +- 5, 1025 +- 6, and 284 +- 2 b for the 2200 m/s total cross sections of /sup 235/U, /sup 239/Pu, and /sup 240/Pu, respectively.

• Research Organization: Oak Ridge National Lab., P.O. Box X, Oak Ridge, TN 37831-6354
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5772075
• Journal Information: Nucl. Sci. Eng.; (United States), Journal Name: Nucl. Sci. Eng.; (United States) Vol. 96:4; ISSN NSENA
• Country of Publication: United States
• Language: English

Related Subjects

652020 -- Nuclear Properties & Reactions
A=220 & above
Experimental
654003* -- Radiation & Shielding Physics-- Neutron Interactions with Matter
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDES
BARYON REACTIONS
BARYONS
CROSS SECTIONS
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
HADRON REACTIONS
HADRONS
METALS
NATIONAL ORGANIZATIONS
NEUTRAL-PARTICLE TRANSPORT
NEUTRON REACTIONS
NEUTRON TRANSPORT
NEUTRONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEONS
ORNL
PLUTONIUM
PLUTONIUM 239 TARGET
PLUTONIUM 240 TARGET
RADIATION TRANSPORT
TARGETS
TOTAL CROSS SECTIONS
TRANSMISSION
TRANSURANIUM ELEMENTS
URANIUM
URANIUM 235 TARGET
US AEC
US DOE
US ERDA
US ORGANIZATIONS