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The Identification of p̄p K X-Rays at LEAR

  • C. A. Baker
  • C. J. Batty
  • J. D. Davies
  • C. W. E. Van Eijk
  • R. Ferreira Marques
  • R. W. Hollander
  • D. Langerveld
  • E. W. A. Lingeman
  • J. Lowe
  • J. Moir
  • J. M. Nelson
  • W. J. C. Okx
  • G. J. Pyle
  • S. Sakamoto
  • A. Selvarajah
  • G. T. A. Squier
  • R. E. Welsh
  • R. G. Winter
  • A. Zoutendijk
Part of the Ettore Majorana International Science Series book series (EMISS, volume 31)

Abstract

The main aim of PS 174 was to measure the spectrum of L and K X-rays coming from p̄ stopping in gaseous hydrogen. Comparing p̄p and electronic hydrogen atoms, atomic energies are raised by mp/me but radii lowered, bringing the innermost orbits within the range of the strong interaction. QED gives L and K X-ray energies in the intervals 1.7–3 and 8–12 kev. Conventional nuclear potential models would shift (ΔE1s) and broaden (Γ1s) the 1s level, and hence the K X-ray energies, by 1/2 - 1 kev and broaden the 2p level (Γ2p) to 20 – 60 mev.1 Γ2p is determined from total L yield = \(\frac{{total\;L\;yield}}{{{K_a}\;yield}} = \frac{{\sum Y{}_L}}{{{Y_{_{_{{K_\alpha }}}}}}} = \frac{{{\Gamma _{2p}}}}{{{\Gamma _{2p}}\left( {radiation} \right)}} \). That Γ2p (rad.) = 0.4 mev shows the very strong p-wave absorption. Shifts and widths outside these values are explained by exotica such as baryonium.

Keywords

Compton Scattering Continuum Background Intense Electrical Field Prevent Water Vapour Proportional Drift 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    J.M. Richard and M.E. Sainio, Phys. Lett. 110B (1982) 349.ADSGoogle Scholar
  2. 2.
    E. Borie and M. Leon, Phys. Rev. A21 (1980) 1460.ADSGoogle Scholar
  3. 2a.
    E. Borie, Physics at LEAR, U. Gastaldi and R. Klapisch ed., Plenum (1984) 185.Google Scholar
  4. 3.
    T.P. Gorringe et al., Phys. Lett 162B (1985) 71.ADSGoogle Scholar

Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • C. A. Baker
    • 5
  • C. J. Batty
    • 5
  • J. D. Davies
    • 1
  • C. W. E. Van Eijk
    • 3
  • R. Ferreira Marques
    • 2
  • R. W. Hollander
    • 3
  • D. Langerveld
    • 3
  • E. W. A. Lingeman
    • 4
  • J. Lowe
    • 1
  • J. Moir
    • 5
  • J. M. Nelson
    • 1
  • W. J. C. Okx
    • 3
  • G. J. Pyle
    • 1
  • S. Sakamoto
    • 5
  • A. Selvarajah
    • 1
  • G. T. A. Squier
    • 1
  • R. E. Welsh
    • 6
  • R. G. Winter
    • 6
  • A. Zoutendijk
    • 3
  1. 1.BirminghamUK
  2. 2.CoimbraPortugal
  3. 3.DelftThe Netherlands
  4. 4.NIKHEF-KAmsterdamThe Netherlands
  5. 5.Rutherford Appleton LaboratoryUK
  6. 6.William and MaryUSA

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