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Photofission and photoneutron cross sections and photofission neutron multiplicities for /sup 233/U, /sup 234/U, /sup 237/Np, and /sup 239/Pu

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

The photonuclear cross sections for /sup 233/U, /sup 234/U, /sup 237/Np, and /sup 239/Pu have been measured from threshold up to 18 MeV. The source of radiation was the monoenergetic photon beam from the annihilation in flight of fast positrons. The branching among the neutron-producing reaction channels was determined by measuring the photofission prompt neutron multiplicities nu-bar/sub p/. One interesting result is the complete absence of any (..gamma..,2n) cross section for /sup 233/U and /sup 234/U. The values of nu-bar/sub p/(E) for /sup 234/U agree with those measured with neutrons incident on /sup 233/U. The parameters of the giant dipole resonance deduced from the total photonuclear cross sections show that these nuclei have large static deformations, as expected. The integrated photofission cross sections are large (as are the absolute fission probabilities), and account for 60% to 80% of the total photonuclear absorption strength.

Research Organization:
Department of Physics, The George Washington University, Washington, DC 20052
OSTI ID:
6895161
Journal Information:
Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 34:6; ISSN PRVCA
Country of Publication:
United States
Language:
English

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Related Subjects

652020* -- Nuclear Properties & Reactions
A=220 & above
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYONS
BREMSSTRAHLUNG
CROSS SECTIONS
DATA
DEFORMATION
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
FERMIONS
FISSION
FISSION NEUTRONS
GIANT RESONANCE
HADRONS
INFORMATION
MEV RANGE
MEV RANGE 10-100
MULTIPLICITY
NEPTUNIUM 237 TARGET
NEUTRONS
NUCLEAR DEFORMATION
NUCLEAR REACTIONS
NUCLEONS
NUMERICAL DATA
PHOTOFISSION
PHOTONEUTRONS
PHOTONUCLEAR REACTIONS
PHOTONUCLEONS
PLUTONIUM 239 TARGET
PROBABILITY
PROMPT NEUTRONS
RADIATIONS
RESONANCE
TARGETS
URANIUM 233 TARGET
URANIUM 234 TARGET