Elsevier

Physics Letters A

Volume 133, Issue 6, 21 November 1988, Pages 309-311
Physics Letters A

Measurement of photon polarization from the three-photon annihilation of orthopositronium

https://doi.org/10.1016/0375-9601(88)90450-1Get rights and content

Abstract

Using a Compton polarization analyzer the linear polarization of one photon from the three-photon decay of orthopositronium under several geometrical conditions has been measured. For α1=45°, 75°, 105° and 120°, the ration of the number of photons Compton-scattered parallel to the plane of the three photons to the number scattered perpendicular to that plane was found to be 1.20±0.03, 1.53±0.03, 1.76±0.06 and 1.86±0.06, respectively. The linear polarization of the photons along the plane of the three photons was determined as 0.15±0.04, 0.33±0.04, 0.49±0.04 and 0.51±0.05, respectively. This result is in agreement with theoretical predictions.

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