Breakup couplings in6He+4Heelastic scattering

The similarity between ${}^6\mathrm{He}{+}^4\mathrm{He}$ and ${}^6\mathrm{Li}{+}^4\mathrm{He}$ elastic scattering data suggests that a previously performed coupled-discretized-continuum channels (CDCC) analysis of ${}^6\mathrm{Li}{+}^4\mathrm{He}$ might be applicable to recently published data for the elastic scattering of ${}^6\mathrm{He}$ from ${}^4\mathrm{He}$ at the three c.m. energies of 11.6, 15.9, and 60.4 MeV. A two-body cluster $\alpha +2n$ structure of ${}^6\mathrm{He}$ was assumed and couplings to the first excited state of ${}^6\mathrm{He}$ at the excitation energy of 1.8 MeV as well as to the states in the continuum were taken into account by means of the CDCC method. The calculations based on the previously performed CDCC analysis of polarized ${}^6\mathrm{Li}{+}^4\mathrm{He}$ scattering at a c.m. energy of 11.1 MeV provide a satisfactory description of the angular distributions of elastically scattered ${}^6\mathrm{He}$ even at backward angles. This result suggests that the large angle scattering has a much smaller two-neutron transfer component than is commonly believed to be present.