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HK: Hadronen und Kerne

HK 57: Atomphysik, angewandte Kernphysik II

HK 57.2: Talk

Wednesday, March 26, 1997, 17:30–17:45, HS L

Spectroscopy of Lα transitions of antiprotonic hydrogen deuterium — •D. Gotta³, D. Anagnostopoulos¹, M. Augsburger², G. Borchert³, C. Castelli⁴, D. Chatellard², P. El-Khoury⁵, J.-P. Egger², M. Elble³, H. Gorke³, P. Hauser⁶, P. Indelicato⁵, K. Kirch⁶, S. Lenz³, N. Nelms⁴, K. Rashid⁷, O.W.B. Schult³, T. Siems³, and L.M. Simons⁶ — ¹Department of Physik, University of Ioannina, Greece — ²Institut de Physique de l’Université de Neuchâtel, Switzerland — ³Institut f"ur Kernphysik, Forschungszentrum, D-52425 J"ulich — ⁴Dept. of Astronomy and Astrophysics, University of Leicester, England — ⁵Institut du Radium, Université Pierre et Marie Curie, Paris, France — ⁶Paul-Scherrer-Institut, Switzerland — ⁷Quad-I-Azam University, Islamabad, Pakistan

In LEAR experiment PS207, the Balmer α transitions of antiprotonic hydrogen and deuterium have been measured directly to compare the strong-interaction effects in the 2p levels of different antiprotonic hydrogen isotopes. The 105 MeV/c antiproton beam was stopped in the cyclotron trap in 20 mbar gas targets. The necessary energy resolution of Δ E/E ≈ 10⁻⁴ was achieved with a two arm Bragg spectrometer using spherically bent crystals. The reflected X-rays were detected in Charge Coupled Devices (CCD’s). The Balmer transitions of the hydrogen isotopes show an additional broadening and shift compared to the experimental line width and the purely electromagnetic transition energies as calculated from QED, which are attributed to the hadronic interaction.