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Measurements of the Total Cross Section for the Scattering of Polarized Neutrons from Polarized $^3$He

C. D. Keith·C. R. Gould·D. G. Haase·M. L. Seely·P. R. Huffman·N. R. Roberson·W. Tornow·W. S. Wilburn
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Abstract

Measurements of polarized neutron--polarized $^3$He scattering are reported. The target consisted of cryogenically-polarized solid $^3$He, thickness 0.04 atom/b and polarization 40%. The longitudinal and transverse total cross-section differences $Δσ_L$ and $Δσ_T$ were measured for incident neutron energies 2-8 MeV. The results are compared to phase-shift predictions based on four different analyses of n-$^3$He scattering. The best agreement is obtained with a recent R-matrix analysis of A=4 scattering and reaction data, lending strong suport to the $^4$He level scheme obtained in that analysis.

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C. D. Keith, C. R. Gould, D. G. Haase, M. L. Seely, P. R. Huffman, N. R. Roberson, W. Tornow, W. S. Wilburn. 1996-07-19. Measurements of the Total Cross Section for the Scattering of Polarized Neutrons from Polarized $^3$He. https://doi.org/10.1103/physrevc.54.477

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