Deep subthreshold photofission yields analysis

Journal Article · Sat Sep 01 04:00:00 EDT 1979 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.20.1059· OSTI ID:6046992

Bellia, G; Del Zoppo, A; Migneco, E; Barna, R C; De Pasquale, D

Photofission yield measurements on /sup 232/Th and /sup 235,236,238/U, showing the ''shelf effect,'' have been analyzed in terms of a double-humped fission barrier. From the characteristic of the shelf it was possible to evaluate the excitation energy E/sub II/ of the shape isomer. In the framework of the double-humped barrier, with the competition between ..gamma.. decay to the shape isomer and tunneling through the outer barrier of a compound state in the second well, it was possible to deduce fission branching ratios in agreement with those known in the literature. In particular for /sup 232/Th a three-humped fission barrier is proposed, the second deep minimum causing the shelf effect and the third one the narrow resonances detected in this isotope.

• Research Organization: Istituto di Fisica: Universita Catania, Istituto Nazionale di Fisica Nucleare-Sez. Catania, Centro Siciliano di Fisica Nucleare e Struttura della Materia-Catania, Italy
• OSTI ID: 6046992
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 20:3; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

652016* -- Nuclear Properties & Reactions
A=220 & above
Theoretical-- Spontaneous & Induced Fission-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BRANCHING RATIO
COMPOUND-NUCLEUS REACTIONS
CROSS SECTIONS
FISSION
FISSION BARRIER
FISSION ISOMERS
FISSION YIELD
GAMMA SPECTRA
NUCLEAR POTENTIAL
NUCLEAR REACTION YIELD
NUCLEAR REACTIONS
PHOTOFISSION
PHOTONUCLEAR REACTIONS
POTENTIALS
SPECTRA
TARGETS
THORIUM 232 TARGET
URANIUM 235 TARGET
URANIUM 236 TARGET
URANIUM 238 TARGET
YIELDS