Abstract
K and L series X-rays have been observed from p p atoms formed in hydrogen gas at NTP in association with annihilations into neutral particles. The total K X-ray yield is (6.5 ± 3.2) × 10 −3 per stopped antiproton. A model-dependent fit of the K X-ray spectrum gives a K α energy of 8.9±0.3 keV, corresponding to a strong interaction shift of (−0.5±0.3) keV.
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