The Angular Distribution of Photons in Orthopositronium Decay into Three Photons

Yang Baozhong; Tan Yong; Tang Xiaowei; Bian Zuhe

Chinese Physics C> 1989, Vol. 13> Issue(S2) : 139-142

The Angular Distribution of Photons in Orthopositronium Decay into Three Photons

Department of Modern Physics, University of Science and Technology of China, Hefei

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Abstract：
The three-photon decay of positronium is studied by using a positronium source, composed of ²²Na and silica aerogel and the triple fast coincidence method. The angular distribution of the photons in the large angle region is measured under symmetrical configuration of two photons with respect to the third photon in the final state. Combining with the data in the small angle region which has been published before, the complete curve of the angular distribution of photons is obtained. The experimental results are in good agreement with the theoretical predicted values.
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Yang Baozhong, Tan Yong, Tang Xiaowei and Bian Zuhe. The Angular Distribution of Photons in Orthopositronium Decay into Three Photons[J]. Chinese Physics C, 1989, 13(S2): 139-142.

Yang Baozhong, Tan Yong, Tang Xiaowei and Bian Zuhe. The Angular Distribution of Photons in Orthopositronium Decay into Three Photons[J]. Chinese Physics C, 1989, 13(S2): 139-142. shu

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Received: 1988-09-05

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沈阳化工大学材料科学与工程学院沈阳 110142

The Angular Distribution of Photons in Orthopositronium Decay into Three Photons

Department of Modern Physics, University of Science and Technology of China, Hefei

Received Date: 1988-09-05

Abstract: The three-photon decay of positronium is studied by using a positronium source, composed of ²²Na and silica aerogel and the triple fast coincidence method. The angular distribution of the photons in the large angle region is measured under symmetrical configuration of two photons with respect to the third photon in the final state. Combining with the data in the small angle region which has been published before, the complete curve of the angular distribution of photons is obtained. The experimental results are in good agreement with the theoretical predicted values.