Pionic Hydrogen
- Gotta, D.
- Amaro, F.D.
- Anagnostopoulos, D.F.
- B̈uhler, A.
- Covita, D.S.
- Gorke, H.
- Gruber, A.
- Hennebach, M.
- Hirtl, A.
- Indelicato, P.
- Ishiwatari, T.
- Le Bigot, E.–O.
- Marton, J.
- Nekipelov, M.
- dos Santos, J.M.F.
- Schlesser, S.
- Schmid, Ph.
- Simons, L.M.
- Strauch, Th.
- Trassinelli, M.
- Veloso, J.F.C.A.
- Zmeskal, J.
DOIAbstract
AbstractK X-rays from pionic hydrogen and deuterium as well as muonic hydrogen have been measured using a highresolution crystal spectrometer at the _E5 beam line of the Paul Scherrer Institut. From the ground-state level shifts and broadenings of the hydrogen isotopes, caused by the strong interaction, low-energy parameters of QCD become accessible as are the pion-nucleon scattering lengths and the threshold production strength of pions in nucleon-nucleon collisions. Muonic hydrogen allows important insights in the de-excitation cascade of such exotic atoms, the understanding of which is essential for a precision determination of the above-mentioned quantities. First experimental results are discussed in the context of recent results from ...
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