Independent yields from the photofission of sup 232 Th, and the Z sub p and statistical-dynamic models

Journal Article · Sun Sep 01 04:00:00 EDT 1991 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.44.1118· OSTI ID:5218441

Smith, J R; Richardson, A E ^[1]

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1. Department of Chemistry, New Mexico State University, Las Cruces, New Mexico (USA)

Independent fission yields were measured for {sup 82}Br, {sup 96}Nb, {sup 124}Sb, and {sup 126}Sb produced by photofission of {sup 232}Th with 27-MeV peak bremsstrahlung and for {sup 136}Cs at 11, 15, and 27 MeV. Upper limits for the independent yields for {sup 86}Rb and {sup 134}Cs and mass yields for mass chains 125 and 127 were also measured for {sup 232}Th photofission at 27 MeV. Various extensions of the {ital Z}{sub {ital p}} charge-distribution model were found to give generally good agreement with experimental measurements in the asymmetric mass regions, but less satisfactory agreement in the symmetric region. A statistical charge-distribution model incorporating post-fission dynamics correlated well with experimental values in both symmetric and asymmetric regions. The statistical-dynamic model naturally predicted pairing and shell effects which were in good agreement with experimentally observed effects. One important outcome of the statistical-dynamic model calculations was the production of a linear shape on the wings of the charge-distribution curve when proximity proton transfer after scission was incorporated into the model. Such linear shapes have previously been experimentally observed without explanation.

• OSTI ID: 5218441
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 44:3; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

652020* -- Nuclear Properties & Reactions
A=220 & above
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BREMSSTRAHLUNG
CHARGE DISTRIBUTION
COMPARATIVE EVALUATIONS
DATA
ELECTROMAGNETIC RADIATION
ENERGY RANGE
EVALUATION
EXPERIMENTAL DATA
FISSION
FISSION YIELD
INFORMATION
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
NUCLEAR MODELS
NUCLEAR REACTION YIELD
NUCLEAR REACTIONS
NUMERICAL DATA
PHOTOFISSION
PHOTONUCLEAR REACTIONS
RADIATIONS
TARGETS
THORIUM 232 TARGET
YIELDS