Measurements of the total cross section for the scattering of polarized neutrons from polarized {sup 3}He

Journal Article · Thu Aug 01 04:00:00 EDT 1996 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.54.477· OSTI ID:288192

Keith, C D; Gould, C R; Haase, D G; Seely, M L ^[1]; Huffman, P R; Roberson, N R; Tornow, W; Wilburn, W S ^[2]

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1. North Carolina State University, Raleigh, Nort Carolina 27695, and Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708 (United States)
2. Duke University, Durham, North Carolina 27708, and Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708 (United States)

Measurements of polarized-neutron{endash}polarized-{sup 3}He scattering are reported. The target consisted of cryogenically polarized solid {sup 3}He, with thickness 0.04 atom/b and polarization {approximately}0.4. Polarized neutrons were produced via the {sup 3}H({ital p}{searrow},{ital n}{searrow}){sup 3}He or {sup 2}H({ital d}{searrow},{ital n}{searrow}){sup 3}He polarization-transfer reactions. The longitudinal and transverse total cross-section differences {Delta}{sigma}{sub {ital L}} and {Delta}{sigma}{sub {ital T}} were measured for incident neutron energies 2{endash}8 MeV. The results are compared to phase-shift predictions based on four different analyses of {ital n}-{sup 3}He scattering. The best agreement is obtained with a recent {ital R}-matrix analysis of {ital A}=4 scattering and reaction data, lending strong support to the {sup 4}He level scheme obtained in that analysis. Discrepancies with other phase-shift parametrizations of {ital n}-{sup 3}He scattering exist, attributable in most instances to one or two particular partial waves. {copyright} {ital 1996 The American Physical Society.}

• DOE Contract Number: FG05-88ER40441; FG05-91ER40619
• OSTI ID: 288192
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 2 Vol. 54; ISSN PRVCAN; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
HELIUM 3 TARGET
HELIUM 4
NEUTRON REACTIONS
PARTIAL WAVES
PHASE SHIFT
POLARIZATION
POLARIZED BEAMS
POLARIZED TARGETS
R MATRIX
TOTAL CROSS SECTIONS
TRANSFER REACTIONS