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Charged pion spectra and energy transfer following antiproton annihilation at rest in carbon and uranium

  • Hadron Physics
  • Published:
Zeitschrift für Physik A Atomic Nuclei

Abstract

The momentum spectra of charged pions following antiproton annihilation at rest in carbon and uranium have been measured. This information complements our previous measurement of the neutral pion spectra. The total charged pion multiplicity is 2.84±0.10 and 2.47±0.09 for carbon and uranium, respectively, in good agreement with recent INC model predictions of 2.96 and 2.48 for the same quantities. However, structures predicted by the model near 200 MeV/c and 300 MeV/c related to delta-resonance production are not seen in the data. The total energy transfers to the nucleus are calculated to be 119±59 MeV(carbon) and 455±50 MeV(uranium). The possibility of exciting multifragmentation with a¯p beam impinging on heavy nuclei is discussed.

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Authors and Affiliations

  1. Laboratory for Elementary Particle Science, Department of Physics, 303 Osmond Laboratory, Pennsylvania State University, University Park, Pennsylvania, USA

    E. D. Minor (NASA Graduate Trainee), T. A. Armstrong, R. Bishop, V. Harris, R. A. Lewis & G. A. Smith

  2. Pennsylvania State University, USA

    E. D. Minor (NASA Graduate Trainee)

  3. Aerospace Engineering Department, Pennsylvania State University, USA

    R. Bishop

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  1. E. D. Minor
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  2. T. A. Armstrong
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  4. V. Harris
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Additional information

Work supported in part by the Air Force Office of Scientific Research, Air Force Systems Command, USAF under grant AFOSR 87-0246 and the U.S. National Science Foundation

NSF Research Experiences for Undergraduates (REU) Awardee

The authors are especially grateful to E. Hernandez and E. Oset, who provided unpublished calculations of multiplicities and momentum spectra for pions. Finally, we thank the staff of the CERN PS Division for their dedicated and skillful operation of LEAR during this experiment.

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Minor, E.D., Armstrong, T.A., Bishop, R. et al. Charged pion spectra and energy transfer following antiproton annihilation at rest in carbon and uranium. Z. Physik A - Atomic Nuclei 336, 461–468 (1990). https://doi.org/10.1007/BF01294119

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