Darmstadt 2008 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 44: Elektromagnetische und Hadronische Sonden I

HK 44.4: Talk

Friday, March 14, 2008, 15:00–15:15, 1B/C

Determination of cascade effects in pionic hydrogen — Dimitrios Anagnostopoulos¹, Daniel Covita², Hubert Gorke³, Detlev Gotta³, Alexander Gruber⁴, Thomas Jensen⁵, Albert Hirtl⁴, Paul Indelicato⁵, Eric-Olivier Le Bigot⁵, Valeri Markushin⁶, Johann Marton⁴, Mikhael Nekipelov³, Joaquim dos Santos², Philipp Schmid⁴, Sophie Schlesser⁵, Leopold Simons⁶, •Thomas Strauch³, Joao Veloso², and Johann Zmeskal⁴ — ¹Univ. Ioannina, Greece — ²Univ. Coimbra, Portugal — ³IKP, FZ Jülich — ⁴Stefan Meyer Inst., Wien — ⁵Lab. Kastler-Brossel, Univ. Paris VI — ⁶PSI, Villigen

The project PIONIC HYDROGEN aims at a precise measurement of the strong interaction shift and width in pionic hydrogen and deuterium being directly related to the π N scattering lengths [1]. The determination of the π N scattering lengths constitutes a high-precision test of the methods of Chiral Perturbation Theory. To extract hadronic shifts and widths correctly it is necessary to take into account the effects during the atomic de-excitation cascade. Most prominent are Coulomb de-excitation and molecular formation. Access to these effects from the pionic atom X-ray energies and line shapes will be discussed. In addition, to study Coulomb de-excitation in absence of strong interaction a high statistics measurement of muonic hydrogen was performed. Results will be compared to predictions of cascade models.

[1] http://www.fz-juelich.de/ikp/exotic-atoms