Pickoff and spin conversion of orthopositronium in oxygen
Shinohara, N; Suzuki, N; Chang, T; Hyodo, T
刊名PHYSICAL REVIEW A
2001
卷号64期号:4页码:42702
学科分类Optics; Physics
DOI10.1103/PhysRevA.64.042702
通讯作者RIKEN, Inst Phys & Chem Res, Wako, Saitama 3510198, Japan ; Acad Sinica, Inst High Energy Phys, Beijing 100080, Peoples R China ; Univ Tokyo, Coll Arts & Sci, Inst Phys, Meguro Ku, Tokyo 1538902, Japan ; Univ Tokyo, Coll Arts & Sci, Inst Phys, Meguro Ku, Tokyo 1538902, Japan
文章类型Article
英文摘要The quenching processes of the thermalized orthopositronium (o-Ps) on an oxygen molecule have been studied by the positron annihilation age-momentum correlation technique. The Doppler-broadening spectrum of the 511-kev gamma rays from the 2 gamma annihilation of o-Ps in O-2 has been measured as a function of the o-Ps age. The rate of the quenching, consisting of the pickoff and the spin conversion, is estimated from the positron lifetime spectrum. The ratio of the pickoff quenching rate to the spin-conversion rate is deduced from the Doppler broadening of the 511-kev gamma rays from the annihilation of the o-Ps. The pickoff parameter (1)Z(eff), the effective number of the electrons per molecule that contribute to the pickoff quenching, for O-2 is determined to be 0.6+/-0.4. The cross section for the elastic spin-conversion quenching is determined to be (1.16+/-0.01) x 10(-19) cm(2).
类目[WOS]Optics ; Physics, Atomic, Molecular & Chemical
研究领域[WOS]Optics ; Physics
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语种英语
WOS记录号WOS:000171609900056
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文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/240607
专题中国科学院高能物理研究所_多学科研究中心_期刊论文
作者单位中国科学院高能物理研究所
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Shinohara, N,Suzuki, N,Chang, T,et al. Pickoff and spin conversion of orthopositronium in oxygen[J]. PHYSICAL REVIEW A,2001,64(4):42702.
APA Shinohara, N,Suzuki, N,Chang, T,&Hyodo, T.(2001).Pickoff and spin conversion of orthopositronium in oxygen.PHYSICAL REVIEW A,64(4),42702.
MLA Shinohara, N,et al."Pickoff and spin conversion of orthopositronium in oxygen".PHYSICAL REVIEW A 64.4(2001):42702.
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