Measurement of the Decay Rate of the Positronium Negative Ion

28 February 1983

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

Vol. 50 (9) , 671-674
https://doi.org/10.1103/physrevlett.50.671

Abstract

Positronium negative ions

{Ps}^{-}

are formed by a beam of 420-eV positrons impinging on a thin carbon film in vacuum. Measurements of the number of ions reaching a grid under different acceleration conditions are used to determine both the

{Ps}^{-}

decay rate

Γ = 2.09 (9)

{nsec}^{- 1}

and its initial kinetic energy

T = 13_{- 10}^{+ 19}

eV. The decay rate is in good agreement with a recent calculation by Ho.

Keywords

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