Pionic hydrogen and friends
- Gotta, D.
- Amaro, F. D.
- Anagnostopoulos, D. F.
- Bühler, P.
- Gorke, H.
- Covita, D. S.
- Fuhrmann, H.
- Gruber, A.
- Hennebach, M.
- Hirtl, A.
- Ishiwatari, T.
- Indelicato, P.
- Jensen, T. S.
- Bigot, E. O Le
- Markushin, V. E.
- Marton, J.
- Nekipelov, M.
- Pomerantsev, V. N.
- Popov, V. P.
- dos Santos, J. M F
- Schlesser, S.
- Schmid, Ph
- Simons, L. M.
- Strauch, Th
- Theisen, M.
- Trassinelli, M.
- Veloso, J. F C A
- Zmeskal, J.
DOIAbstract
Pion-nucleon scattering lengths are directly related to the ground-state level shift and broadening in pionic hydrogen as well as to the pionic deuterium level shift. The level broadening in deuterium measures the strength of pion threshold-production in proton-proton reactions. However, collisional processes during the atomic de-excitation cascade considerably complicate the analysis of X-ray line shapes in order to extract the hadronic broadening. Therefore, additionally the purely electromagnetic twin system muonic hydrogen was studied. Results of these experiments performed at PSI by using a high-resolution crystal spectrometer are discussed in the context with a new analysis approach for the hadronic broadening.</p
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