Strong Tensor Term in the Optical Potential for 20-MeV Deuteron Scattering fromHe4

Abstract
For elastic scattering of 20-MeV polarized deuterons from He4 we measured vector and tensor analyzing powers including Axz(θ). An optical-model analysis demands a tensor term of 13 MeV, which exceeds the folding-model value by a factor of 2.