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Large Enhancement of the Sub-barrier Fusion Probability for a Halo Nucleus

2000; American Physical Society; Volume: 84; Issue: 11 Linguagem: Inglês

10.1103/physrevlett.84.2342

1092-0145

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,

Nuclear Physics and Applications

The fusion-fission cross sections of the 4He+238U and 6He+238U systems have been measured, at Louvain-la-Neuve, for energies around and below the Coulomb barrier, using an array of Si detectors surrounding a UF4 target. The data taken with 4He are in good agreement with previous data and with the coupled channel fusion calculation performed with ECIS. The 6He data show a regular trend with a large enhancement below the barrier which is attributed to the halo structure of the 6He nucleus.