Abstract
We have measured the Doppler broadening of neutron time-of-flight spectra from the reaction π− p → π0 + n in atomic states. From the data, we infer that the kinetic energy distribution of π− p-atoms in liquid and gaseous hydrogen contains discrete ‘high-energy’ components with energies as high as 200 eV attributed to Coulomb de-excitation. In liquid hydrogen, evidence for Coulomb de-excitation transitions with Δn = 2 has been found.
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Schottmüller, J., Badertscher, A., Daum, M. et al. Kinetic energy of π− p-atoms in liquid and gaseous hydrogen. Hyperfine Interactions 119, 95–102 (1999). https://doi.org/10.1023/A:1012662720273
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DOI: https://doi.org/10.1023/A:1012662720273