High resolution photofission measurements and intermediate structure in /sup 232/Th

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1986

OSTI ID:5079467

Zhang, H

The photofission cross section of /sup 232/Th was measured in the energy range 5.8-12 MeV with an average photon energy resolution of 600 eV. The gamma rays, variable in energy, were obtained from narrow (p,..gamma..) resonances in various nuclei. Intermediate structure was observed at subbarrier excitation energies. The average spacing of photofission resonances provided the first relatively direct determination of the energy of the second minimum of the fission barrier, relative to the ground state. The measured fission probability and various properties of the intermediate structure were found to agree with calculated values based on a double bumped fission barrier. The features of this barrier, a rather high first hump and a deep secondary well, are quite different from the predictions of current theoretical barrier calculations.

• Research Organization: City Univ. of New York, NY (USA)
• OSTI ID: 5079467
• Country of Publication: United States
• Language: English

Related Subjects

652026* -- Nuclear Properties & Reactions
A=220 & above
Experimental-- Spontaneous & Induced Fission-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
CROSS SECTIONS
DATA
ENERGY DEPENDENCE
ENERGY RANGE
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
FISSION
FISSION BARRIER
HEAVY NUCLEI
INFORMATION
ISOTOPES
MEV RANGE
MEV RANGE 01-10
MEV RANGE 10-100
NUCLEAR POTENTIAL
NUCLEAR REACTIONS
NUCLEI
NUMERICAL DATA
PHOTOFISSION
PHOTONUCLEAR REACTIONS
POTENTIALS
PROBABILITY
RADIOISOTOPES
THORIUM 232
THORIUM ISOTOPES
YEARS LIVING RADIOISOTOPES