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

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.

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