Scattering of polarized fast neutrons from /sup 9/Be, /sup 54/Fe, /sup 65/Cu, and /sup 208/Pb: the determination of the nucleon-nucleus spin-orbit interaction

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1981

OSTI ID:6259517

Floyd, Jr, C E

In order to investigate the spin-dependence of the nucleon-nucleus interaction, a new facility has been developed to measure analyzing powers for the scattering of polarized neutrons. This new facility, incorporating an efficient pulsing system for polarized ion beams, allows accurate neutron analyzing power data to be acquired in a reasonable length of accelerator time. Results are reported here for neutron scattering from the ground and first 5/2/sup -/ (2.4 MeV) excited states in /sup 9/Be at 9, 10, 11, 13, and 15 MeV incident neutron energies, the ground state in /sup 54/Fe, /sup 65/Cu, and /sup 208/Pb at 10 and 14 MeV, the first 2/sup +/ (1.4 MeV) state in /sup 54/Fe at 10 MeV, and the combined first 3/sup -/ (2.6 MeV) and 5/sup -/ (3.2 MeV) states in /sup 208/Pb at 10 MeV. Cross-section data were obtained at 10, 14, and 17 MeV for scattering from the ground state of /sup 208/Pb. At 10 MeV, cross-section data were obtained for scattering from the combined 3/sup -/ + 5/sup -/ states in /sup 208/Pb. Elastic scattering measurements have been parameterized in the framework of the spherical optical model. With the exception of the /sup 208/Pb forward angle data, the A/sub y/(theta) for elastic scattering are reasonably well described by the spherical optical model. Our parameterization of the spin-orbit term in the optical model for neutron scattering is consistant with that obtained recently for proton scattering. Inelastic scattering measurements have been investigated using the coupled channels formalism. A deformation of the spin-orbit term in the coupled channels model has been determined.

• Research Organization: Duke Univ., Durham, NC (USA)
• OSTI ID: 6259517
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANALYZING POWER
BARYON REACTIONS
BEAMS
BERYLLIUM 9 TARGET
COPPER 65 TARGET
COUPLED CHANNEL THEORY
COUPLING
CROSS SECTIONS
DATA
ENERGY RANGE
EXPERIMENTAL DATA
HADRON REACTIONS
INFORMATION
INTERMEDIATE COUPLING
IRON 54 TARGET
L-S COUPLING
LEAD 208 TARGET
MEV RANGE
MEV RANGE 01-10
MEV RANGE 10-100
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUMERICAL DATA
OPTICAL MODELS
POLARIZED BEAMS
SCATTERING
TARGETS