Freiburg 1999 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 26: Elektromagnetische und hadronische Proben V
HK 26.1: Talk
Tuesday, March 23, 1999, 16:30–16:45, C
Spectroscopy of characteristic X-radiation from antiprotonic hydrogen — •D. Gotta3, D.F. 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, Th. Siems3, and L.M. Simons6 — 1Dep. of Physics, Univ. of Ioannina, Greece — 2Inst. de Physique, Univ. de Neuchâtel, Switzerland — 3Inst. f"ur Kernphysik, Forschungszentrum J"ulich — 4Dep. of Astronomy and Astrophysics, Univ. of Leicester, England — 5Lab. Kastler-Brossel, Univ. P. et M. Curie, Paris, France — 6Paul-Scherrer-Institut(PSI), Switzerland — 7Quad-I-Azam University, Islamabad, Pakistan
X-rays from antiprotonic hydrogen have been measured by LEAR experiment PS207 both directly using CCD detectors and with a high resolution crystal spectrometer. The results for the hadronic s- and p-wave interaction are discussed and compared to theoretical predictions. Summarizing the results obtained from this and previous protonium experiments performed before the shut-down of LEAR, it turns out that, although rather precise values have been obtained for the spin-averaged strong interaction parameters, especially for the 1s ground state the situation remains unsatisfactorily with regard to the individual hyperfine components. A remeasurement of the 2p-1s transitions both for antiprotonic hydrogen and deuterium is desirable. Possible measurement schemes are discussed based on the AD facility presently set up at CERN [1]. +EU fellow (contract no, FMBICT950378)
[1] AD design study: S.Baird et al. CERN/PS 96-43(AR),1996