PRECISION-MEASUREMENT OF THE ORTHOPOSITRONIUM DECAY-RATE USING THE VACUUM TECHNIQUE

被引：125

作者：

NICO, JS ^{[1
]}

GIDLEY, DW ^{[1
]}

RICH, A ^{[1
]}

ZITZEWITZ, PW ^{[1
]}

机构：

[1] UNIV MICHIGAN,DEPT NAT SCI,DEARBORN,MI 48128

来源：

PHYSICAL REVIEW LETTERS | 1990年 / 65卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.65.1344

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A focused beam of 700-eV positrons is used to form orthopositronium (o-Ps) in evacuated, MgO-lined cavities of different sizes. The o-Ps decay rate T is determined to be 7.04820.0016 s-1 after extrapolation to infinite cavity size. This 230-ppm result is 4 times more accurate than previous measurements utilizing the vacuum technique. Subject to radically different systematic effects, it corroborates at the 6.2 level the discrepancy between theory and a recent 200-ppm measurement of T in gases. © 1990 The American Physical Society.

引用

页码：1344 / 1347

页数：4

共 24 条

[1] RADIATIVE-CORRECTIONS TO POSITRONIUM DECAY [J].