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Giant resonance for the actinide nuclei: Photoneutron and photofission cross sections for /sup 235/U, /sup 236/U, /sup 238/U, and /sup 232/Th

Journal Article · · Phys. Rev., C; (United States)
; ; ; ;

The photoneutron cross sections sigma (..gamma..,n) and sigma (..gamma..,2n), and total photofission cross sections sigma (..gamma..,F) have been measured for /sup 235/U, /sup 236/U, /sup 238/U, and /sup 232/Th from threshold to 18.3 MeV using monoenergetic photons from the annihilation in flight of fast positrons and neutron-multiplicity detection in an efficient 4..pi.. neutron detector. Use of the ring-ratio technique allowed both the average photofission neutron energy for each nucleus to be obtained as a function of photon energy and, for /sup 236/U and /sup 238/U, the determination of the partial cross sections for first-chance sigma (..gamma.., f ) and second-chance sigma (..gamma..,n f ) photofission as well. Information extracted from the data includes integrated cross sections and their moments, giant-resonance parameters, deformation and radius parameters, and relative and absolute neutron and fission probabilities.

Research Organization:
Los Alamos Scientific Laboratory, University of California, Los Alamos, New Mexico 87545
OSTI ID:
5479459
Journal Information:
Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 21:4; ISSN PRVCA
Country of Publication:
United States
Language:
English

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Related Subjects

652026* -- Nuclear Properties & Reactions
A=220 & above
Experimental-- Spontaneous & Induced Fission-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYONS
BREMSSTRAHLUNG
CROSS SECTIONS
DEFORMATION
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FISSION
GIANT RESONANCE
HADRONS
INTERACTIONS
MEV RANGE
MEV RANGE 01-10
MEV RANGE 10-100
MULTIPLICITY
NEUTRONS
NUCLEAR DEFORMATION
NUCLEAR PROPERTIES
NUCLEAR RADII
NUCLEAR REACTIONS
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHOTOFISSION
PHOTONEUTRONS
PHOTONUCLEAR REACTIONS
PHOTONUCLEONS
PROBABILITY
RADIATIONS
RESONANCE
TARGETS
THORIUM 232 TARGET
TOTAL CROSS SECTIONS
URANIUM 235 TARGET
URANIUM 236 TARGET
URANIUM 238 TARGET