State Conversion of Positronium by Oxygen

Zhang Tianbao; Xu Min

Chinese Physics C> 1990, Vol. 14> Issue(S3) : 211-218

State Conversion of Positronium by Oxygen

Zhang Tianbao ,
Xu Min

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

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Using a silica aerogel sample filled with oxygen gas as a variable energy positronium source, the effect of the positronium motion in oxygen has been investigated with a time selecting energy spectrometer. The positronium state conversion in an inelastic collision between the fast positronium atom and oxygen molecule has been verified and the conversion cross sections are measured as 2.1×10^-17 cm² and 6.6×10^-18 cm² respectively at the kinetic energies of positronium near two thresholds. For the slow positronium, the conversion cross section due to the exchange of electrons in the elastic collision is found to be proportional to 1/√v, where v is the mean velocity of positronium. This process would provide a clean para-positronium source for other precise experiments.

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Zhang Tianbao and Xu Min. State Conversion of Positronium by Oxygen[J]. Chinese Physics C, 1990, 14(S3): 211-218.

Zhang Tianbao and Xu Min. State Conversion of Positronium by Oxygen[J]. Chinese Physics C, 1990, 14(S3): 211-218. shu

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Received: 1989-05-11

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Supported by the National Natural Science Foundation of China.

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通讯作者: 陈斌, [email protected]

1.
沈阳化工大学材料科学与工程学院沈阳 110142

State Conversion of Positronium by Oxygen

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

Received Date: 1989-05-11

Fund Project: Supported by the National Natural Science Foundation of China.

Abstract: Using a silica aerogel sample filled with oxygen gas as a variable energy positronium source, the effect of the positronium motion in oxygen has been investigated with a time selecting energy spectrometer. The positronium state conversion in an inelastic collision between the fast positronium atom and oxygen molecule has been verified and the conversion cross sections are measured as 2.1×10^-17 cm² and 6.6×10^-18 cm² respectively at the kinetic energies of positronium near two thresholds. For the slow positronium, the conversion cross section due to the exchange of electrons in the elastic collision is found to be proportional to 1/√v, where v is the mean velocity of positronium. This process would provide a clean para-positronium source for other precise experiments.

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