Elsevier

Nuclear Physics B

Volume 53, Issue 1, 12 February 1973, Pages 9-18
Nuclear Physics B

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

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Abstract

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.

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