Elastic {pi}{sup +} scattering on polarized {sup 3}He

Journal Article · Sat Apr 01 04:00:00 EST 1995 · Bulletin of the American Physical Society

OSTI ID:374775

Espy, M; Davis, B; Dehnhard, D ^[1]

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1. and others

The authors measured asymmetries, A{sub y}, for {pi}{sup +} - {sup 3}He elastic scattering at incident energies T{pi} = 100, 142, 180, and 256 MeV and laboratory scattering angles from 40{degrees} to 100{degrees}. With increasing energy the A{sub y} are predicted to become sensitive to the details of the reaction model. The measurements were done at LAMPF using a high-density, optically-pumped {sup 3}He gas target and a magnetic spectrometer. The angular distributions at T{pi} = 100, 142, and 180 MeV show large positive A{sub y} near 80{degrees} with the maximum shifted to higher angles than predicted by first-order optical model calculations. The sign of A{sub y} near 80{degrees} is observed to change between T{pi} = 180 and 256 MeV. At 180 MeV and below the A{sub y} are relatively large and negative at angles near 60{degrees}, in contrast to several first-order calculations which predict small positive A{sub y}. A preliminary calculation suggests that these negative asymmetries are a signature of the Delta-neutron spin-spin interaction.

• OSTI ID: 374775
• Report Number(s): CONF-9304297--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 2 Vol. 40; ISSN BAPSA6; ISSN 0003-0503
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANGULAR DISTRIBUTION
ASYMMETRY COEFFICIENTS
ELASTIC SCATTERING
HELIUM 3 TARGET
MEV RANGE 100-1000
PION PLUS REACTIONS
POLARIZED TARGETS