Observation of Kaonic Hydrogen KαX Rays

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

Research output: Contribution to journalArticlepeer-review

263 Citations (Scopus)


We have measured the shift and width of the kaonic hydrogen 1s state due to the K-N strong interaction. We have observed, for the first time, distinct K-series kaonic hydrogen x rays with good signal-to-noise ratio in the energy spectrum. The measured energy shift and width were determined to be ΔE(1s) = -323 ± 63(stat) ± 11(syst) eV (repulsive) and γ(1s) = 407 ± 208(stat) ± 100(syst) eV, respectively.

Original languageEnglish
Pages (from-to)3067-3069
Number of pages3
JournalPhysical review letters
Issue number16
Publication statusPublished - 1997 Apr 21
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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