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024 7 _ |a 10.1140/epja/s10050-021-00387-x
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100 1 _ |a Hirtl, A.
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245 _ _ |a Redetermination of the strong-interaction width in pionic hydrogen
260 _ _ |a Heidelberg
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520 _ _ |a The hadronic width of the ground state of pionic hydrogen has been redetermined by X-ray spectroscopy to be meV. The experiment was performed at the high-intensity low-energy pion beam of the Paul Scherrer Institute by using the cyclotron trap and a high-resolution Bragg spectrometer with spherically bent crystals. Coulomb de-excitation was studied in detail by comparing its influence on the line shape by measuring the three different transitions K, K, and K at various hydrogen densities. The pion-nucleon scattering lengths and other physical quantities extracted from pionic-atom data are in good agreement with the results obtained from pion-nucleon and nucleon-nucleon scattering experiments and confirm that a consistent picture is achieved for the low-energy pion-nucleon sector with respect to the expectations of chiral perturbation theory.
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700 1 _ |a Anagnostopoulos, D. F.
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700 1 _ |a Covita, D. S.
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700 1 _ |a Fuhrmann, H.
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700 1 _ |a Gorke, H.
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700 1 _ |a Gotta, D.
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700 1 _ |a Gruber, A.
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700 1 _ |a Hennebach, M.
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700 1 _ |a Indelicato, P.
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700 1 _ |a Jensen, Th. S.
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700 1 _ |a Bigot, E.-O. Le
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700 1 _ |a Liu, Y.-W.
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700 1 _ |a Markushin, V. E.
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700 1 _ |a Marton, J.
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700 1 _ |a Nekipelov, M.
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700 1 _ |a Santos, J. M. F. dos
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700 1 _ |a Simons, L. M.
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700 1 _ |a Strauch, Th.
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700 1 _ |a Trassinelli, M.
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700 1 _ |a Veloso, J. F. C. A.
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700 1 _ |a Zmeskal, J.
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773 _ _ |a 10.1140/epja/s10050-021-00387-x
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