2019 Impact factor 2.176
Hadrons and Nuclei


Eur. Phys. J. A 13, 123-127 (2002)

Fusion-fission reactions induced by $\chem{^{6}He}$-ions

Yu.E. Penionzhkevich1, Yu.A. Muzychka1, S.M. Lukyanov1, R. Kalpakchieva1, N.K. Skobelev1, V.P. Perelygin1 and Z. Dlouhy2

1  Flerov Laboratory of Nuclear Reactions, JINR, 141980 Dubna, Moscow Region, Russia
2  Institute of Nuclear Physics, Rez near Prague, Czech Republic

pyuer@nrsun.jinr.ru

(Received: 1 May 2001 / Revised version: 7 September 2001)

Abstract
The experimentally measured excitation functions for the fission and 4n evaporation channels are presented for the $\chem{^{6}He + {}^{209}Bi}$ reaction. The secondary $\chem{^{6}He}$ beam was produced using the special beam line (Q4DQ-spectrometer) of the U400M accelerator at FLNR, JINR. The comparison of the obtained experimental data with similar results for the $\chem{^{4}He + {}^{209}Bi}$ reaction shows that in the case of the $\chem{^{6}He + {}^{209}Bi}$ reaction a significant enhancement of the cross-section is observed for energies above the barrier. In order to get an agreement between the experimental data and the theoretical calculations it is necessary to reduce the Coulomb barrier by 15-20% , which corresponds to an increase of the parameter r0 of the nuclear potential up to 1.5-1.6 fm.

PACS
25.60.-t - Reactions induced by unstable nuclei.
25.70.Jj - Fusion and fusion-fission reactions.
24.10.-i - Nuclear-reaction models and methods.

© Società Italiana di Fisica, Springer-Verlag 2002