Abstract
The cross section for \ensuremath{\alpha}-particle emission in the $^{6}\mathrm{He}+^{209}\mathrm{Bi}$ reaction at energies near the Coulomb barrier is remarkably large. Possible reactions that may produce the observed \ensuremath{\alpha} particles include two-neutron transfer, one-neutron transfer, and direct projectile breakup. Each of these mechanisms results in a distinctive angular correlation between the \ensuremath{\alpha} particle and the outgoing neutron(s). A neutron-\ensuremath{\alpha}-particle coincidence experiment was performed to study two-neutron transfer to unbound states of $^{211}\mathrm{Bi}$. It is shown that approximately 55% of the observed \ensuremath{\alpha}-particle yield at and beyond the grazing angle is because of this process. This is more than 2.5 times the fraction attributable to single-neutron transfer. The corresponding 2n-transfer cross section is 0.4 \ifmmode\pm\else\textpm\fi{} 0.1 b.
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