X iv : n uc l - ex / 9 60 70 11 v 1 1 9 Ju l 1 99 6 Measurements of the Total Cross Section for the Scattering of Polarized Neutrons from Polarized 3 He
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چکیده
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 ∼ 0.4. Polarized neutrons were produced via the 3 H(p, n) 3 He or 2 H(d, n) 3 He polarization-transfer reactions. The longitudinal and transverse total cross-section differences ∆σ L and ∆σ 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 support to the 4 He level scheme obtained in that analysis. Discrepancies with other phase-shift parameterizations of n-3 He scattering exist, attributable in most instances to one or two particular partial waves.
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تاریخ انتشار 1996