2000•Physical Review LettersOpen access
Large Enhancement of the Sub-barrier Fusion Probability for a Halo Nucleus
M. Trotta, J.L. Sida, N. Alamanos, A. N. Andreyev, F. Auger, D. L. Balabanski, C. Borcea, N. Coulier, A. Drouart, D. J. C. Durand, G. Georgiev, A. Gillibert, J. Hinnefeld, M. Huýse, Cédric Jouanne, V. Lapoux, A. Lépine, A. Lumbroso, F. Marie, A. Musumarra, G. Neyens, S. Ottini, R. Raabe, Stefaan Ternier, P. Van Duppen, K. Vyvey, C. Volant, R. Wolski
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Abstract
The fusion-fission cross sections of the ${}^{4}\mathrm{He}{+}^{238}\mathrm{U}$ and ${}^{6}\mathrm{He}{+}^{238}\mathrm{U}$ systems have been measured, at Louvain-la-Neuve, for energies around and below the Coulomb barrier, using an array of Si detectors surrounding a ${\mathrm{UF}}_{4}$ target. The data taken with ${}^{4}\mathrm{He}$ are in good agreement with previous data and with the coupled channel fusion calculation performed with ECIS. The ${}^{6}\mathrm{He}$ data show a regular trend with a large enhancement below the barrier which is attributed to the halo structure of the ${}^{6}\mathrm{He}$ nucleus.