Precision spectroscopy of Kaonic Helium 3d → 2p X-rays

S. Okada, G. Beer, H. Bhang, M. Cargnelli, J. Chiba, S. Choi, C. Curceanu, Y. Fukuda, T. Hanaki, R. S. Hayano, M. Iio, T. Ishikawa, S. Ishimoto, T. Ishiwatari, K. Itahashi, M. Iwasaki, B. Juhász, P. Kienle, J. Marton, Y. MatsudaH. Ohnishi, 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

2 Citations (Scopus)


We have measured the strong-interaction shift of 2p states of kaonic helium-4 atoms with a precision of ∼2 eV using Silicon Drift Detectors (SDDs) which lead to much improved energy resolution and signal-to-noise ratio compared to the conventional Si(Li) x-ray detector used in the past experiments. The measurement will give an answer to the longstanding "kaonic helium puzzle" and provide crucial information to understand the basis of the Akaishi-Yamazaki prediction of deeply-bound kaonic nuclei, which is one of the interpretations of the strange multibaryon candidates recently reported at KEK, DAΦNE and BNL.

Original languageEnglish
Pages (from-to)663c-666c
JournalNuclear Physics A
Issue number1-4
Publication statusPublished - 2007 Jun 15


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