RESIDUE EXCITATION-FUNCTIONS FROM COMPLETE FUSION OF O-16 WITH AU-197AND PB-208

Citation
Kt. Brinkmann et al., RESIDUE EXCITATION-FUNCTIONS FROM COMPLETE FUSION OF O-16 WITH AU-197AND PB-208, Physical review. C. Nuclear physics, 50(1), 1994, pp. 309-316
Citations number
43
Categorie Soggetti
Physics, Nuclear
ISSN journal
05562813
Volume
50
Issue
1
Year of publication
1994
Pages
309 - 316
Database
ISI
SICI code
0556-2813(1994)50:1<309:REFCFO>2.0.ZU;2-J
Abstract
Evaporation residue excitation functions and alpha-multiplicities from complete fusion of O-16 with Au-197 and Pb-208 have been measured fro m the fusion threshold up to 140 MeV incident energy. The data allow t he conclusion that strongly overdamped motion cannot be dominant at en ergies in the vicinity of the fusion barrier below E almost-equal-to 50 MeV. At excitation energies above 50 MeV the residue cross section for O-16 + Pb-208 is much greater than predicted from the statistical model with conventional parametrizations. The enhancement is not expla ined by incorporating dynamical effects into the analysis. An alternat ive suggestion based on deexcitation-chain dependent fission barriers is discussed.