Photoproduction of π + mesons on polarized protons at photon energies between 0.5 and 2.2 GeV

The target asymmetry T = ( σ↑ − σ↓)/( σ↑ + σ↓) for the reaction γp → π +n has been measured at the Bonn 2.5 GeV electron synchrotron for a pion c.m. angle of 40° and γ energies between 0.5 and 2.2 GeV. Butanol was used as the target material. About 35% of the protons could be polarized using the dyn...

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Bibliographic Details
Published in:Nuclear physics. B 1973-01, Vol.53 (1), p.9-18
Main Authors: Althoff, K.H., Feller, P., Herr, H., Hoffmann, W., Kadansky, V., Menze, D., Opara, U., Schittko, F.J., Schulz, W., Schwille, W.J.
Format: Article
Language:English
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Summary:The target asymmetry T = ( σ↑ − σ↓)/( σ↑ + σ↓) for the reaction γp → π +n has been measured at the Bonn 2.5 GeV electron synchrotron for a pion c.m. angle of 40° and γ energies between 0.5 and 2.2 GeV. Butanol was used as the target material. About 35% of the protons could be polarized using the dynamic-polarization method in a continuous-flow cryostat operating at 1°K and 25 kG. The π + mesons were detected in a magnetic-spectrometer system. Considerable structure in the asymmetry was observed.
ISSN:0550-3213
1873-1562
DOI:10.1016/0550-3213(73)90303-9