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MASS AND ENERGY DISTRIBUTIONS IN THE SPONTANEOUS FISSION OF SOME HEAVY ISOTOPES

Journal Article · · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
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A back-to-back semiconductor counter system was used to study the energy and mass distributions of the fission fragments in the spontaneous fission of the isotopes, Fm/sup 254/, E/sup 253/, Cf/sup 254/, and Cm/sup 248/. The results are compared to the fission fragments produced by the spontaneous fission of Cf/sup 252/, whose fission properties are well known. All distributions (including those of the odd-mass isotope E/sup 253/) are rather similar, but not identical with the standard Cf/sup 252/. The mean prompt kinetic energy of the frgaments increases with Z, and this trend is compared with the results of other related experiments. The asymmetry of the mass distributions shows only small differences between the isotopes studied here. Some theoretical aspects of the asymmetries are discussed. The variance (widths) of nearly all the distributions increases with Z and seems to increase with A. A new semiempirical correlation between the variances and Z/sup 2//A is proposed and interpreted on a qualitative basis. The effects of neutron emission on the results are briefly discussed and the values of the mean total kinetic energy release are corrected for the effect of neutron emission. (auth)
Research Organization:
Univ. of California, Berkeley
NSA Number:
NSA-17-036704
OSTI ID:
4648912
Report Number(s):
UCRL-10506; 0031-899X
Journal Information:
Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 131; ISSN PHRVA
Country of Publication:
United States
Language:
English

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Related Subjects

CALIFORNIUM 252
CALIFORNIUM 254
COUNTERS
CURIUM 248
DISTRIBUTION
EINSTEINIUM 253
ELECTRIC CHARGES
EMISSION
ENERGY
FERMIUM 254
FISSION
FISSION PRODUCTS
ISOTOPES
MASS
MEASURED VALUES
NEUTRONS
PHYSICS
SEMICONDUCTORS
STATISTICS
VELOCITY