Proton-proton spin correlation measurements at 200 MeV with an internal target in a storage ring
- Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States)
- Indiana University and Indiana University Cyclotron Facility, Bloomington, Indiana 47408 (United States)
- Western Michigan University, Kalamazoo, Michigan 49008 (United States)
Measurements of the pp spin correlation coefficients A{sub xx}, A{sub yy}, and A{sub xz} and analyzing power A{sub y} for pp elastic scattering at 197.8 MeV over the angular range 4.5{degree}{endash}17.5{degree} have been carried out. The statistical accuracy is approximately {plus_minus}0.01 for A{sub mn} and {plus_minus}0.004 for A{sub y}, while the corresponding scale factor uncertainties are 2.4{percent} and 1.3{percent}, respectively. The experiment makes use of a polarized hydrogen gas target internal to a proton storage ring (IUCF Cooler) and a circulating beam of polarized protons. The target polarization (Q=0.79) is switched in sign and in direction (x,y,z) every 2 s by reversing a weak guide field (about 0.3 mT). The forward-scattered protons are detected in two sets of wire chambers and a scintillator, while recoil protons are detected in coincidence with the forward protons by silicon strip detectors placed 5 cm from the proton beam. The background rate from scattering by the walls of the target cell is (0.2{plus_minus}0.2){percent} of the good event rate. Analysis methods and comparisons with pp potential models and pp partial wave analyses are described. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 450482
- Journal Information:
- Physical Review, C, Journal Name: Physical Review, C Journal Issue: 2 Vol. 55; ISSN PRVCAN; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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