Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurements of the Total Cross Section for the Scattering of Polarized
  Neutrons from Polarized $^3$He   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 $\Delta\sigma_L$ and $\Delta\sigma_T$ 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.

33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
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The categories of this paper are: eess
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The categories of this paper are: atom-ph
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The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: supr-con
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The categories of this paper are: hep-lat
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The categories of this paper are: math
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The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn