Analyzing power in elastic scattering of6He from a polarized proton target at 71 MeV/nucleon
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Abstract
The vector analyzing power has been measured for the elastic scattering of neutron-rich ${}^{6}$He from polarized protons at 71 MeV/nucleon making use of a newly constructed solid polarized proton target operated in a low magnetic field and at high temperature. Two approaches based on local one-body potentials were applied to investigate the spin-orbit interaction between a proton and a ${}^{6}$He nucleus. An optical model analysis revealed that the spin-orbit potential for ${}^{6}$He is characterized by a shallow and long-ranged shape compared with the global systematics of stable nuclei. A semimicroscopic analysis with an $\ensuremath{\alpha}$+$n$+$n$ cluster folding model suggests that the interaction between a proton and the $\ensuremath{\alpha}$ core is essentially important in describing the $p$+${}^{6}$He elastic scattering. The data are also compared with fully microscopic analyses using nonlocal optical potentials based on nucleon-nucleon $g$ matrices.