Reexamination of the nuclear orientation model of quasifission reactions to explain anomalous fragment anisotropies at sub-barrier energies
- Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Calcutta 700 064 (India)
- Nuclear Physics Division, Bhabha Atomic Research Centre, Bombay 400 085 (India)
In the present work we have measured fission fragment angular distributions and fusion excitation functions for the systems {sup 12}C, {sup 16}O+{sup 232}Th at energies around the Coulomb barrier. These results along with the results of our earlier measurements on {sup 19}F + {sup 232}Th system were analyzed following Hinde {ital et} {ital al}. [Phys. Rev. Lett. {bold 74}, 1295 (1995)] where it was pointed out that the anomalous fission fragment angular distributions seen in heavy ion reactions below the Coulomb barrier can be due to possible occurrence of quasifission events caused by the interaction of the projectile with the tip of the deformed target nucleus. The present data do not show the expected saturation behavior of the fission fragment anisotropy at sub-barrier energies for the {sup 12}C+{sup 232}Th system which exhibits different behavior of the fission fragment anisotropy in the sub-barrier region as compared to the other two systems. The present measurements using different projectiles on the same target nucleus do not seem to conform to the expected behavior of the quasifission mechanism to be caused by the interaction of the projectile with the tip of the deformed target nucleus. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 279478
- Journal Information:
- Physical Review, C, Vol. 53, Issue 2; Other Information: PBD: Feb 1996
- Country of Publication:
- United States
- Language:
- English
Similar Records
Fusion-fission versus quasifission: Effect of nuclear orientation
Conclusive evidence for the influence of nuclear orientation on quasifission