Nuclear photofissility at intermediate and high energies

Journal Article · Wed Feb 01 04:00:00 EST 1995 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.51.751· OSTI ID:6866499

Arruda-Neto, J D.T.; Deppman, A ^[1]; Bianchi, N; De Sanctis, E ^[2]

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1. Physics Institute, University of Sao Paulo, P.O. Box 20516, 01452-990 Sao Paulo, Sao Paulo (Brazil)
2. Istituto Nazionale di Fisica Nucleare-Laboratori Nazionali di Frascati, P.O. Box 13, I-00044 Frascati (Italy)

The nuclear photofissility of actinides, at intermediate and high energies, was studied by means of a formalism which makes salient the aspects of preequilibrium emissions, compound nucleus formation, and fission decay of the equilibrated system. This formalism was applied in the interpretation of the recently measured photofissilities of [sup 232]Th and [sup 238]U, in the energy range 300--1200 MeV, using (a) an intranuclear cascade Monte Carlo calculation to describe the preequilibrium and thermalization processes, and (b) the statistical model for the fission decay of the compound nucleus. It was found that the nonsaturation of the [sup 232]Th photofissility, even at energies up to 1200 MeV, could be explained as a consequence of its higher nuclear transparency, when compared with heavier actinides. Also, the question about a possible competition between statical and direct fission in [sup 232]Th and [sup 238]U was addressed.

• OSTI ID: 6866499
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 51:2; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

663300 -- Nuclear Reactions & Scattering
General-- (1992-)
663470* -- Fission-- (1992-)
663590 -- Nuclear Mass Ranges-- A=220 & Above-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
CALCULATION METHODS
COMPOUND NUCLEI
ENERGY RANGE
EQUILIBRIUM
EVEN-EVEN NUCLEI
FISSION
HEAVY NUCLEI
ISOTOPES
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 100-1000
MONTE CARLO METHOD
NUCLEAR CASCADES
NUCLEAR REACTIONS
NUCLEI
PHOTOFISSION
PHOTONUCLEAR REACTIONS
RADIOISOTOPES
SLOWING-DOWN
SPONTANEOUS FISSION RADIOISOTOPES
STATISTICAL MODELS
THERMALIZATION
THORIUM 232
THORIUM ISOTOPES
URANIUM 238
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES