Pionic X-rays from argon and hydrogen plus argon
Pionic X-ray spectra from argon and hydrogen plus argon have been measured with a high-pressure gas target. Energy and natural width of the 3d−2p)-line were determined to beE=168.88±0.10 keV andΓ=1.17±0.17keV, respectively. An upper limit of 56% at 90% confidence was obtained for the probability of pion transfer from hydrogen to argon.