Elastic Scattering Of Neutron-Rich Helium Isotopes From Polarized Protons At 71 Mev/A

The vector analyzing power has been measured for the elastic scattering of neutron-rich He-6 and He-8 from polarized protons at 71 MeV/A making use of a newly constructed solid polarized proton target operated in a low magnetic field of 0.1 T and at a relatively high temperature of 100 K. An optical model analysis revealed that the spin-orbit potentials for He-6 and He-8 are characterized by shallow and long-ranged shape compared with the global systematics of stable nuclei. Such a characteristics reflect a diffused density distribution of the neutron-rich isotopes.