Measurement of the Radiation Energy in Parapositronium Two Gamma Annihilation

Zhang Tianbao; Wang Haidong; Shen Zhiqi

Chinese Physics C> 1991, Vol. 15> Issue(S3) : 227-234

Measurement of the Radiation Energy in Parapositronium Two Gamma Annihilation

Institute of High Energy Physics, the Chinese Academy of Sciences, Beijing, China

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Abstract：
The γ ray energy from the parapositronium 2γ annihilation is measured as 510998.7(2.5) eV by using a silica aerogel sample with oxygen gas filled as the positronium source and by comparing with the known γ energy 511856.2(2.3) eV of the ¹⁰⁶Ru γ ray. The result, after correction of the binding energy of Ps,is compared with the adjusted value of the electron rest mass.

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Zhang Tianbao, Wang Haidong and Shen Zhiqi. Measurement of the Radiation Energy in Parapositronium Two Gamma Annihilation[J]. Chinese Physics C, 1991, 15(S3): 227-234.

Zhang Tianbao, Wang Haidong and Shen Zhiqi. Measurement of the Radiation Energy in Parapositronium Two Gamma Annihilation[J]. Chinese Physics C, 1991, 15(S3): 227-234. shu

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Received: 1990-11-13

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Supported by the National Natural Science Foundation of China.

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