TRIPLET TO SINGLET CONVERSION OF POSITRONIUM IN OXYGEN

  • Using a aerogel sample with introduced oxygen gas as a variable energy positronium source,the triplet to singlet conversion of positronium in the elastic and inelastic collisions between positronium atoms and oxygen molecules has been investigated with a time selecting energy spectrometer.We have found that the conversion cross section σ0—p is proportional to 1/v for slow positronium in the elastic collisons,where v is the mean velocity of positronium,and for the inelastic processes,the cross sections are estimated to be σ0—p=2.1×10-17cm2 and 6.6×10-18cm2 respectively at kinetic energies of positronium near two thresholds.
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  • [1] M. Deutsch and S. Berko, "ALPHA-, BETA- AND GAMMA-RAY SPECTROSCOPY" ed. by K.Siegbahn, (Amsterdam, 1965, North-Holland) p. 1583.[2] M. Kakimoto, T. Hyodo, T. Chiba, T. Akahare and T. B Chang,J.Phys. B; At. Mol.,Phys., 20(1987), L107.[3] R. A. Ferrell, Phys. Rev., 110(1958), 1355.[4] R. F. Kiefl, "POSITRON ANNLHILATION", 1CPA-6, p. 690,1982.[5] 徐敏、曾湘涛、黄开平、张天保,高能物理与核物理,V. 12(1988), 447.[6] 张天保,正电子湮没时间选择能谱仪的技术发展和应用,物理4(1990)待发表.[7] Tang Xiaowei, Wu Guahung and Wang Yunyu,“ POSITRON ANNIHILATION", ICPA-6, p. 880 1982.
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ZHANG Tian-Bao and XU Min. TRIPLET TO SINGLET CONVERSION OF POSITRONIUM IN OXYGEN[J]. Chinese Physics C, 1990, 14(4): 289-295.
ZHANG Tian-Bao and XU Min. TRIPLET TO SINGLET CONVERSION OF POSITRONIUM IN OXYGEN[J]. Chinese Physics C, 1990, 14(4): 289-295. shu
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Received: 1900-01-01
Revised: 1900-01-01
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TRIPLET TO SINGLET CONVERSION OF POSITRONIUM IN OXYGEN

    Corresponding author: ZHANG Tian-Bao,
  • Inatitute of High Energy Physiscs,Academia Sinica,Beijing

Abstract: Using a aerogel sample with introduced oxygen gas as a variable energy positronium source,the triplet to singlet conversion of positronium in the elastic and inelastic collisions between positronium atoms and oxygen molecules has been investigated with a time selecting energy spectrometer.We have found that the conversion cross section σ0—p is proportional to 1/v for slow positronium in the elastic collisons,where v is the mean velocity of positronium,and for the inelastic processes,the cross sections are estimated to be σ0—p=2.1×10-17cm2 and 6.6×10-18cm2 respectively at kinetic energies of positronium near two thresholds.

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