München 2006 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 23: Elektromagnetische und Hadronische Sonden
HK 23.5: Vortrag
Dienstag, 21. März 2006, 18:00–18:15, G
Pionic Hydrogen — •D. Gotta1, D.F. Anagnostopoulos2, E.-O. Le Bigot3, S. Biri4, D.D.S. Covita5, P. Indelicato3, A. Gruber6, A. Hirtl6, T. Ishiwatari6, Th. Jensen3, J. Marton6, M. Nekipelov1, J.M.F. dos Santos5, Ph. Schmid6, L.M. Simons7, Th. Strauch1, M. Trassinelli3, J.F.C.A. Veloso8, and J. Zmeskal6 — 1IKP, FZ Jülich, Germany — 2Dept.of Mat.Sc., Univ. Ioannina, Greece — 3Lab. Kastler-Brossel, Univ. P. et M.Curie, Paris — 4Inst. Nucl. Res. (ATOMKI), Debrecen, Hungary — 5Phys. Dept., Univ. Coimbra, Portugal — 6SMI, Österr. Ak. der Wiss., Vienna, Austria — 7PSI, Switzerland — 8Phys. Dept., Univ. Aveiro, Portugal
The strong level shift and broadening in pionic hydrogen allow to determine fundamental quantities of the pion-nucleon interaction like the isospin scattering lengths a± and the π N coupling constant. The new pionic hydrogen experiment performed at the Paul-Scherrer-Institut (PSI, Switzerland) uses a high-resolution crystal spectrometer and the cyclotron trap II and is aiming at a precision determination of the above-mentioned quantities at the per cent level by measuring π H K X-ray transitions. The experiment has been continued by 1) a study of muonic hydrogen in order to identify directly the acceleration of exotic hydrogen during the atomic cascade (Coulomb de-excitation) which hinders the direct extraction of the hadronic broadening from the line width, 2) a precise determination of the spectrometer response with X-rays from helium-like atoms produced in an electron cyclotron resonance ion trap, and 3) a high-statistics measurement of the π H(2p−1s) transition. First results from these experiments are presented.