New Measurement of the Positronium Hyperfine Interval

Publisher Website

3 February 1975

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 34 (5) , 246-250
https://doi.org/10.1103/physrevlett.34.246

Abstract

The hyperfine interval

Δ ν

of the positronium ground state has been measured with significantly improved accuracy. Using a S

F_{6}

buffer gas we obtain

Δ ν = 203.3875 \pm 0.0017

GHz and

{(Δ ν)}^{- 1} \frac{\partial Δ ν}{\partial D} = (- 8.0 \pm 0.4) \times 10^{- 5}

{amagat}^{- 1}

. Using a

N_{2}

buffer gas we obtain

Δ ν = 203.3854 \pm 0.0029

GHz and

{(Δ ν)}^{- 1} \frac{\partial Δ ν}{\partial D} = (- 2.1 \pm 0.6) \times 10^{- 5}

{amagat}^{- 1}

. No evidence is found for a quadratic dependence of

Δ ν

on density in either gas.

Keywords

This publication has 13 references indexed in Scilit:

Fourth-Order Vacuum Polarization Correction to the Positronium Hyperfine Structure
Physical Review Letters, 1973
Higher-Precision Determination of the Fine-Structure Interval in the Ground State of Positronium, and the Fine-Structure Density Shift in Nitrogen
Physical Review Letters, 1972
Hydrogenic Atoms in a Magnetic Field
Physical Review A, 1971
The Present Status of Quantum Electrodynamics
Annual Review of Nuclear Science, 1970
Precision Redetermination of the Fine-Structure Interval of the Ground State of Positronium and a Direct Measurement of the Decay Rate of Parapositronium
Physical Review A, 1970
Determination of $\frac{e}{h}$ , Using Macroscopic Quantum Phase Coherence in Superconductors: Implications for Quantum Electrodynamics and the Fundamental Physical Constants
Reviews of Modern Physics, 1969
Precision Redetermination of the Hyperfine Structure Interval of Positronium
Physical Review Letters, 1967
Hyperfine Structure of Positronium in Its Ground State
Physical Review B, 1957
Magnetic Quenching of the Positronium Decay
Physical Review B, 1954
Zeeman Effect and Hyperfine Splitting of Positronium
Physical Review B, 1952