Observation of kaonic hydrogen atom x rays

T. M. Ito, R. S. Hayano, S. N. Nakamura, T. P. Terada, M. Iwasaki, 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

185 Citations (Scopus)


We have measured the K-series x rays from kaonic hydrogen atoms and have succeeded for the first time in observing a distinct [Formula Presented] peak. The L x-ray peak has also been observed. The strong-interaction shift and width of the kaonic hydrogen atom [Formula Presented] state were determined from the transition energy and the line width of the [Formula Presented] x rays. The sign of the strong-interaction shift was confirmed to be repulsive, with the results [Formula Presented] and [Formula Presented] The measured shift and width of the [Formula Presented] state are consistent with those expected from other low energy [Formula Presented] data, and thus the long-standing kaonic hydrogen puzzle is resolved. The [Formula Presented] x-ray yield per stopped kaon was estimated to be [Formula Presented] at a hydrogen target density of [Formula Presented].

Original languageEnglish
Pages (from-to)2366-2382
Number of pages17
JournalPhysical Review C - Nuclear Physics
Issue number4
Publication statusPublished - 1998
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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