학술논문
First observation of o-Ps to p-Ps transition and first direct measurement of positronium hyperfine splitting with sub-THz light.
Document Type
Article
Author
Source
Subject
*POSITRONIUM
*HYPERFINE interactions
*ZEEMAN effect
*MAGNETIC fields
*FIELD theory (Physics)
*
*
*
*
Language
ISSN
0304-3843
Abstract
Positronium is an ideal system for the research of the bound state QED. The hyperfine splitting of positronium (Ps-HFS, about 203 GHz) is an important observable but all previous measurements of Ps-HFS had been measured indirectly using Zeeman splitting. There might be the unknown systematic errors on the uniformity of magnetic field. We are trying to measure Ps-HFS directly using sub-THz radiation. We developed an optical system to accumulate high power (about 10 kW) radiation in a Fabry-Pérot resonant cavity and observed the positronium hyperfine transition for the first time. [ABSTRACT FROM AUTHOR]