Fission barriers, coupled-channel, and shell effects at the Coulomb barrier in the A{approx}190 mass region
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1 (Canada)
- TRIUMF, 400 Westbrook Mall, Vancouver, British Columbia, Canada V6T 2A3 (Canada)
- Institut de Recherches Subatomiques, F-67037 Strasbourg Cedex 2, (France)
- Nuclear Science Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)
A study of the role of coupled-channel effects in the enhancement of the population of high-spin states was undertaken with the reactions {sup 48}Ca+{sup 142}Nd and {sup 80}Se+{sup 110}Pd, near the Coulomb barrier, leading to the same compound nucleus, {sup 190}Hg, at the same excitation energy. Statistical calculations with standard values for the level density parameters and fission barriers predict an enhancement of the high-spin population for the more mass-symmetric system, brought about by the coupling to inelastic channels in the fusion process. No enhancement was observed which we interpret as an inadequacy of the fission barriers used, and to the role of the shell corrections, in particular those at the saddle point. (c) 2000 The American Physical Society.
- OSTI ID:
- 20215382
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 61, Issue 2; Other Information: PBD: Feb 2000; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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