TRIPLET TO SINGLET CONVERSION OF POSITRONIUM IN OXYGEN

ZHANG Tian-Bao; XU Min

Chinese Physics C> 1990, Vol. 14> Issue(4) : 289-295

TRIPLET TO SINGLET CONVERSION OF POSITRONIUM IN OXYGEN

ZHANG Tian-Bao ^, ,
XU Min

Inatitute of High Energy Physiscs,Academia Sinica,Beijing

Abstract
HTML
Reference
Related

PDF

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 σ_0—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 σ_0—p=2.1×10^－17cm² and 6.6×10^－18cm² respectively at kinetic energies of positronium near two thresholds.

References

[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.

Access

Get Citation

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

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

Received: 1900-01-01
Revised: 1900-01-01

Article Metric

Article Views(3161)
PDF Downloads(483)
Cited by(0)

Policy on re-use

To reuse of subscription content published by CPC, the users need to request permission from CPC, unless the content was published under an Open Access license which automatically permits that type of reuse.

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

TRIPLET TO SINGLET CONVERSION OF POSITRONIUM IN OXYGEN

ZHANG Tian-Bao ^,
XU Min

Corresponding author: ZHANG Tian-Bao,

Inatitute of High Energy Physiscs,Academia Sinica,Beijing

Received Date: 1900-01-01
Accepted Date: 1900-01-01
Available Online: 1990-04-05

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 σ_0—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 σ_0—p=2.1×10^－17cm² and 6.6×10^－18cm² respectively at kinetic energies of positronium near two thresholds.