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.
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A. P. Mills (1983) studied this question.
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