Fission before {ital K} equilibration

Journal Article · Thu Aug 01 04:00:00 EDT 1996 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.54.761· OSTI ID:286817

Liu, Z; Zhang, H; Xu, J; Qiao, Y; Qian, X; Lin, C ^[1]

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1. China Institute of Atomic Energy, Beijing 102413 (China)

It is demonstrated experimentally that the reaction systems on the different side of Businaro-Gallone critical mass asymmetry ({alpha}{sub BG}) have different characteristics in fusion-fission reactions. Fragment anisotropies resulting from the reactions with the entrance-channel mass asymmetry {alpha}{approx_gt}{alpha}{sub BG} are well described by the saddle-point transition-state model. However, the measured fragment anisotropies for the systems with {alpha}{lt}{alpha}{sub BG} are obviously greater than the predictions of this model at subbarrier and near-barrier energies and gradually tend to coincide with the theoretical expectations as the bombarding energy increasing over fusion barrier. These observations have led us to a suggestion of preequilibrium fission for low angular momentum. The predictions of such a preequilibrium fission model are compared with the available experimental data and it is shown that they can satisfactorily reproduce the observed trends as a function of the bombarding energy for the reaction systems studied. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 286817
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 2 Vol. 54; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANISOTROPY
ASYMMETRY
EQUILIBRIUM
FISSION
MASS
NUCLEAR FRAGMENTS
SADDLE-POINT METHOD