“Di-Neutron” Configuration of6He

Two-neutron transfer reactions induced by the Borromean nucleus ${}^6\mathrm{He}$ on ${}^4\mathrm{He}$ and ${}^1\mathrm{H}$ targets are analyzed within a realistic four-body model. Available experimental data are well described, and it is the “di-neutron” configuration of the ${}^6\mathrm{He}$ nucleus that is found to make the dominant contribution to the cross sections of the two-neutron transfer reactions.