Solving the kaonic-helium puzzle

Ryugo S. Hayano, G. Beer, H. Bhang, M. Cargnelli, J. Chiba, S. Choi, C. Curceanu, Y. Fukuda, T. Hanaki, M. Iio, T. Ishikawa, S. Ishimoto, T. Ishiwatari, K. Itahashi, M. Iwai, M. Iwasaki, B. Juhász, P. Kienle, J. Marton, Y. MatsudaH. Ohnishi, S. Okada, H. Outa, M. Sato, P. Schmid, S. Suzuki, T. Suzuki, H. Tatsuno, D. Tomono, E. Widmann, T. Yamazaki, H. Yim, J. Zmeskal

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We have measured the Balmer-series x-rays of kaonic 4He atoms using large-area silicon drift x-ray detectors (SDDs) in order to study the low-energy K̄-nucleus strong interaction. The energy of the 3d → 2p transition was determined to be 6467 ± 3(stat) ± 2(syst) eV. The resulting strong-interaction energy-level shift is in agreement with theoretical calculations, thus eliminating a long-standing discrepancy between theory and experiment.

Original languageEnglish
Pages (from-to)2505-2511
Number of pages7
JournalModern Physics Letters A
Issue number27-30
Publication statusPublished - 2008 Sep 30
Externally publishedYes


  • Kaon-baryon interactions
  • Kaonic X-rays
  • Mesonic atoms

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Astronomy and Astrophysics
  • Physics and Astronomy(all)


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