Experiments with a high-density positronium gas

被引：105

作者：

Cassidy, DB ^{[1
]}

Deng, SHM

Greaves, RG

Maruo, T

Nishiyama, N

Snyder, JB

Tanaka, HKM

Mills, AP

机构：

[1] Univ Calif Riverside, Dept Phys, Riverside, CA 92521 USA

[2] First Point Sci Inc, Agoura Hills, CA 91301 USA

[3] Osaka Univ, Div Chem Engn, Osaka 5608531, Japan

[4] Principia Coll, Dept Phys, Elsah, IL 62028 USA

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.95.195006

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have created a high-density gas of interacting positronium (Ps) atoms by irradiating a thin film of nanoporous silica with intense positron bursts and measured the Ps lifetime using a new single-shot technique. When the positrons were compressed to 3.3x10(10) cm(-2), the apparent intensity of the orthopositronium lifetime component was found to decrease by 33%. We believe this is due to a combination of spin exchange quenching and Ps(2) molecule formation associated with colliding pairs of oppositely polarized triplet positronium atoms. Our data imply an effective cross section for this process of 2.9x10(-14) cm(-2).

引用

页数：4

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