Measurements of the Total Cross Section for the Scattering of Polarized Neutrons from Polarized 3He
C. D. Keith, C. R. Gould, D. G. Haase, M. L. Seely, P. R. Huffman, N. R. Roberson, W. Tornow, W. S. Wilburn
Abstract
Measurements of polarized neutron--polarized 3He scattering are reported. The target consisted of cryogenically-polarized solid 3He, thickness 0.04 atom/b and polarization 40%. The longitudinal and transverse total cross-section differences ΔσL and ΔσT were measured for incident neutron energies 2-8 MeV. The results are compared to phase-shift predictions based on four different analyses of n-3He scattering. The best agreement is obtained with a recent R-matrix analysis of A=4 scattering and reaction data, lending strong suport to the 4He level scheme obtained in that analysis.
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