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High resolution photofission measurements in /sup 238/U and /sup 232/Th. Final report. [5. 8 to 12 MeV]

Technical Report ·
OSTI ID:6286674
A novel technique for measuring the photofission cross section with very high photon energy resolution has been developed. The photons are obtained from selected resonances in the (p,..gamma..) reaction on various light nuclei. The photon energy resolution approaches 200 eV in favorable cases. The photon energy spread at each (p,..gamma..) resonance is approx.20 keV on the average. Measurements of the photo-fission cross sections of /sup 232/Th and /sup 238/U have been carried out in the energy range from 5.8 to 12 MeV. Intermediate structure has been found in both nuclei at excitation energies around 6 MeV. Various properties of this structure, such as average areas of resonances, their spacing, width, and the underlying bakground, as well as the experimental fission probability averaged over the intermediate structure have been found to agree with theoretical predictions based on a double-humped fission barrier. In the case of /sup 232/Th, the feature of this barrier, a rather high first hump and a deep secondary well, are quite different from those predicted by current theoretial barrier calculations. 13 refs., 4 figs., 3 tabs.
Research Organization:
Brooklyn Coll., NY (USA)
DOE Contract Number:
AC02-79ER10452
OSTI ID:
6286674
Report Number(s):
DOE/ER/10452-15; ON: DE86004706
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
CROSS SECTIONS
DATA
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
ENERGY RANGE
EXPERIMENTAL DATA
FISSION
FISSION BARRIER
INFORMATION
INTERMEDIATE STRUCTURE
MEV RANGE
MEV RANGE 01-10
MEV RANGE 10-100
MONOCHROMATIC RADIATION
NUCLEAR POTENTIAL
NUCLEAR REACTIONS
NUMERICAL DATA
PHOTOFISSION
PHOTONUCLEAR REACTIONS
POTENTIALS
RADIATIONS
TARGETS
THORIUM 232 TARGET
URANIUM 238 TARGET