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Precision measurement of antiprotonic hydrogen and deuterium X-rays

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Zeitschrift für Physik A Hadrons and Nuclei

Abstract

X-rays from antiprotonic hydrogen and deuterium have been measured at low pressures. Using the cyclotron trap, a 105 MeV/c antiproton beam from LEAR was stopped with an efficiency of 86% in 30 mbar hydrogen gas in a volume of only 100 cm3. The X-rays were measured with Si(Li) detectors and a Xe-CH4 drift chamber. The strong interaction shift and broadening of the Lymanα transition and the spin-averaged 2p width in antiprotonic hydrogen was measured with unprecedented accuracy. The triplet component of the ground state in antiprotonic hydrogen was determined for the first time.

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Author notes

  1. R. Bacher

    Present address: DESY, Notkestrasse 85, W-2000, Hamburg 52, Germany

  2. A. Badertscher

    Present address: Institute of Intermediate Energy Physics, ETH Zürich, CH-5232, Villigen PSI, Switzerland

  3. K. Heitlinger

    Present address: Universität Tübingen, Auf der Morgenstelle 14, W-7400, Tübingen, Germany

Authors and Affiliations

  1. Kernforschungszentrum Karlsruhe GmbH, Institut für Kernphysik, Germany

    K. Heitlinger & P. Blüm

  2. Institut für Experimentelle Kernphysik der Universität, Postfach 3640, W-7500, Karlsruhe, Germany

    K. Heitlinger & P. Blüm

  3. Paul Scherrer Institut (formerly Schweizerisches Institut für Nuklearforschung), CH-5232, Villigen (PSI), Switzerland

    R. Bacher, A. Badertscher, J. Egger, E. Morenzoni & L. M. Simons

  4. CERN, CH-1211, Geneva 23, Switzerland

    J. Eades & K. Elsener

  5. Forschungszentrum Jülich GmbH, Institut für Kernphysik, Postfach 1913, W-5170, Jülich, Germany

    D. Gotta

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  1. K. Heitlinger
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  2. R. Bacher
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  3. A. Badertscher
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  4. P. Blüm
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  5. J. Eades
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  6. J. Egger
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  7. K. Elsener
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  8. D. Gotta
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  10. L. M. Simons
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Additional information

The authors would like to thank the LEAR staff for their efforts in providing the antiproton beam. The help of P. Gauss from the CERN cryogenic group and of P. Zettwoch from the PS workshop is gratefully acknowledged. We wish to thank K.-P. Wieder for his help with the drawings. This work is part of the Ph.D. thesis of one of us (K.H., University of Karlsruhe, 1990).

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Heitlinger, K., Bacher, R., Badertscher, A. et al. Precision measurement of antiprotonic hydrogen and deuterium X-rays. Z. Physik A - Hadrons and Nuclei 342, 359–368 (1992). https://doi.org/10.1007/BF01291519

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  • DOI: https://doi.org/10.1007/BF01291519

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