${}^6\mathrm{He}$ interaction with protons

Experimental data for ${}^6\mathrm{He}{+}^1\mathrm{H}$ elastic scattering and the two-neutron transfer reaction, measured recently at the Joint Institute for Nuclear Research in Dubna, Russia, were analyzed by coupled channels calculations using a dineutron model of ${}^6\mathrm{He}.$ The results of the analysis reveal that all the processes induced by ${}^6\mathrm{He}$ on a hydrogen target are coupled. This analysis shows that the couplings to the ${}^6\mathrm{He}\to \alpha +2n$ breakup channels can be included in a simple optical model calculation by means of a polarization potential that is repulsive and whose strength is about 25% of the single-folding potential. Predictions for the ${p+}^6\mathrm{He}$ inelastic scattering to the $2^{+}$ resonance are made. A good description of the two-neutron transfer reaction data is obtained when the triton transfer process is coherently added to the dineutron transfer. The spectroscopic amplitude of the $t+t$ component of the ${}^6\mathrm{He}$ ground-state wave function is found to have the opposite sign to that of $\alpha +2n$ with a magnitude close to that predicted by a microscopic four-cluster model of ${}^6\mathrm{He}.$