Hyperfine Interactions

, Volume 118, Issue 1–4, pp 45–51 | Cite as

Observation of kaonic hydrogen atom X-ray

  • S.N. Nakamura
  • K. Bartlett
  • G.A. Beer
  • G.R. Gill
  • R.S. Hayano
  • T.M. Ito
  • M. Iwasaki
  • L. Lee
  • G. Mason
  • A. Olin
  • H. Outa
  • M. Salomon
  • R. Seki
  • T. Taniguchi
  • T.P. Terada
  • G. Trayling
  • Y. Yamashita
  • S. Yen
Article

Abstract

We successfully observed clear K-series kaonic hydrogen X-rays for the first time taking advantage of two charged pions tagging technique and a gaseous hydrogen target. The strong-interaction energy shift and width of 1s state of Kp atom were determined to be ΔE1s = -323 ± 63 (statistical) ± 11 (systematic) eV and Г1s = 407 ± 208 ± 100 eV. Our result means that the Kp strong interaction near threshold is repulsive and the long-standing kaonic hydrogen puzzle is solved.

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References

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Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • S.N. Nakamura
    • 1
  • K. Bartlett
    • 2
  • G.A. Beer
    • 2
  • G.R. Gill
    • 3
  • R.S. Hayano
    • 4
  • T.M. Ito
    • 5
  • M. Iwasaki
    • 6
  • L. Lee
    • 7
  • G. Mason
    • 2
  • A. Olin
    • 3
  • H. Outa
    • 7
  • M. Salomon
    • 3
  • R. Seki
    • 5
  • T. Taniguchi
    • 8
  • T.P. Terada
    • 4
  • G. Trayling
    • 2
  • Y. Yamashita
    • 8
  • S. Yen
    • 3
  1. 1.Muon Science LaboratoryThe Institute of Physical and Chemical Research (RIKEN)SaitamaJapan
  2. 2.Department of Physics and AstronomyUniversity of VictoriaVictoriaCanada
  3. 3.TRIUMFVancouverCanada
  4. 4.Department of PhysicsUniversity of TokyoTokyoJapan
  5. 5.W.K. Kellogg Radiation LaboratoryCalifornia Institute of TechnologyPasadenaUSA
  6. 6.Department of PhysicsTokyo Institute of TechnologyTokyoJapan
  7. 7.Department of PhysicsUniversity of ManitobaWinnipegCanada
  8. 8.High Energy Accelerator Research Organization (KEK)Ibaraki o305-0801Japan

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