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HK: Hadronen und Kerne
HK 5: Hadronic Probes I, Protons, Antiprotons, Pions
HK 5.2: Gruppenbericht
Montag, 16. März 1998, 14:30–15:00, C
Protonium X-ray Spectroscopy — •D. Gotta3, D. Anagnostopoulos +1, M. Augsburger2, G. Borchert3, C. Castelli4, D. Chatellard2, P. El-Khoury5, J.-P. Egger2, 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
The high resolution spectroscopy of the Balmer α transitions of
the antiprotonic hydrogen isotopes has been performed at LEAR. The antiproton
beam was stopped using the cyclotron trap at a gas pressure of 20 mbar
and the X-rays were measured with a high resolution Bragg crystal spectrometer.
For the first time, the strong interaction shift and broadening of the
23P0 hyperfine state in protonium could be observed. The results support
the meson-exchange models describing the medium and long range part of the
nucleon-antinucleon interaction. The observation of the strong interaction
effects in the 2p level of antiprotonic deuterium allows the direct comparison
of the two elementary antiprotonic systems.
+EU fellow (contract no, FMBICT950378)