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Measurement of balmer and lyman X-rays in antiprotonic hydrogen isotopes at pressures below 300 hPa

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Zeitschrift für Physik A Atomic Nuclei

Abstract

X-Rays of Balmer and Lyman transitions in antiprotonic hydrogen and of Balmer transitions in antiprotonic deuterium were observed at pressures below 300 hPa using Si(Li) semiconductor detectors. The measurement was performed at the LEAR-facility at a beam momentum of 202 MeV/c. In order to stop antiprotons in a low pressure gaseous target with high efficiency, a novel technique, the cyclotron trap has been used. Absolute yields were determined and compared with cascade calculations. A distinct difference in the cascade of antiprotonic hydrogen and deuterium is found. The parameters of strong interaction in antiprotonic hydrogen are determined to beɛ 1s=−(620±100) eV,Γ 1s=(1130±170) eV andΓ 2p=(32±10) meV.

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Author information

Author notes

  1. R. Bacher

    Present address: Paul Scherrer Institut, CH-5232, Villigen, Switzerland

  2. D. Gotta

    Present address: KFA Jülich, IKP, Postfach 1913, D-5170, Jülich, FRG

  3. D. Rohmann

    Present address: Universität Bochum, Postfach 102148, D-4630, Bochum, FRG

  4. M. Schneider

    Present address: Asea Brown Boveri, CH-5400, Baden, Switzerland

Authors and Affiliations

  1. Kernforschungszentrum Karlsruhe GmbH, Institut für Kernphysik, Karlsruhe, Federal Republic of Germany

    R. Bacher, P. Blüm, D. Gotta, K. Heitlinger, D. Rohmann & M. Schneider

  2. Institut für Experimentelle Kernphysik der Universität, Karlsruhe, Federal Republic of Germany

    R. Bacher, P. Blüm, D. Gotta, K. Heitlinger, D. Rohmann & M. Schneider

  3. Paul Scherrer Institut, (formerly Schweizerisches Institutfür Nuklearforschung), Villigen, Switzerland

    J. Egger & L. M. Simons

  4. CERN, Geneva, Switzerland

    K. Elsener

  5. Paul Scherrer Institut, CH-5232, Villigen, Switzerland

    K. Heitlinger

Authors
  1. R. Bacher
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  2. P. Blüm
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  3. D. Gotta
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  4. K. Heitlinger
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  5. D. Rohmann
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  6. M. Schneider
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  7. J. Egger
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  8. L. M. Simons
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  9. K. Elsener
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Additional information

The authors would like to thank V.E. Markushin for suggestions and discussions. The efforts of the LEAR staff and of P. Gauss from the CERN cryogenic group were very helpful. We wish further to thank J. Missimer for suggesting improvements as well as M. Stoll for technical support and C.T.A.M. de Laat for a new evaluation code.

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Bacher, R., Blüm, P., Gotta, D. et al. Measurement of balmer and lyman X-rays in antiprotonic hydrogen isotopes at pressures below 300 hPa. Z. Physik A - Atomic Nuclei 334, 93–102 (1989). https://doi.org/10.1007/BF01294391

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  • DOI: https://doi.org/10.1007/BF01294391

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