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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[14]	Chen Zhiqian . Binding Strength and Oxygen Coordination of the Fe Sites in High T_c GdBa₂Cu₃O_7-δ. Chinese Physics C, 1993, 17(S3): 225-229.
[15]	Cheng Zitao , Qian Qing , Fu Yunchang , Chen Xuejun . Study of Antihydrogen-Atom Formation in Antiproton-Positronium Collisions. Chinese Physics C, 1993, 17(S2): 171-178.
[16]	Wang Shan , Liu Yiming , Jiang Yuzhen , Chen Xiaofan , D. Keane , S. Y. Fung , S. Y. Chu . Azimuthal Correlation Function and the Nuclear Equation of State. Chinese Physics C, 1990, 14(S4): 361-366.
[17]	ZHANG Tian-Bao , XU Min . TRIPLET TO SINGLET CONVERSION OF POSITRONIUM IN OXYGEN. Chinese Physics C, 1990, 14(4): 289-295.
[18]	Zheng Bo . Exact Ground State of Lattice Schwinger Model. Chinese Physics C, 1989, 13(S3): 259-262.
[19]	M. I. Adamovich , M. M. Aggarwal , R. Arora , Y. A. Alexandrov , S. A. Azimov , S. K. Badyal , E. Basova , K. B. Bhalla , A. Bhasin , V. S. Bhatia , R. A. Bondarenko , T. H. Burnett , Cai Xu , L. P. Chernova , M. M. Cherayavski , B. Dressel , E. M. Friedlander , S. I , Gadzhieva , E. R. Ganssauge , S. Garpman , S. G. Gerassimov , A. Gill , J. Grote , K. G. Gulamov , U. G. Gulyamov , V. K Gupta , S. Hackel , H. H. Heckman , B. Jakobsson , B. Judek , S. Kachroo , F. G. Kadyrov , H. Kallies , L. Karlsson , G. L. Kanl , M. Kaur , S. P. Kharlamov , J. Kohli , V. Kumar , P. Lai , V. G. Larionova , P. J. Lindstrom , Liu Lianshou , S. Lokanathan , J. Lord , N. S. Lukicheva , L. K. Mangotra , N. V. Maslennikova , I. S. Mittra , E. Monnand , S. Mookeijee , C. Mueller , S. H. Nasyrov , V. S. Navotny , G. I. Orlova , I. Otterlund , N. G. Peresadko , S. Persson , N. V. Petrov , Qian Wanyan , R. Raniwala , S. Raniwala , N. K. Rao , J. T. Rhee , N. Saidkhanov , N. A. Salmanova , W. Schultz , F. Schussler , V. S. Shukla , D. Skelding , K. Söderström , E. Stenlud , R. S. Storey , Sun Junfen , L. N. Svechnikova , M. I. Tretyakova , T. P. Trofimova , Wang Haiqiao , Weng Zhiqun , R. J. Wilkes , Xu Guofa , Zhang Donghai , Zheng Puying , Zhou Daicui , Zhou Jmgchen . Charged Particle Spectra in Oxygen-Induced Reactions at 14.6 and 60 GeV/nucleon. Chinese Physics C, 1989, 13(S4): 341-346.
[20]	HE Ming-Ke , RAO Jian-Xi , LIN Da-Hang . THE RELATIVISTIC CORRECTIONS FOR CROUND STATE ENERGY OF THE POSITRONIUM NEGATIVE ION. Chinese Physics C, 1986, 10(2): 146-152.

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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, bchen63@163.com

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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.

State Conversion of Positronium by Oxygen

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