First measurement of kaonic helium-3 X-rays

SIDDHARTA collaboration , M. Bazzi , G. Beer , L. Bombelli , A.M. Bragadireanu , M. Cargnelli , G. Corradi , C. Curceanu (Petrascu)

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A. d'Uffzi C. Fiorini T. Frizzi F. Ghio B. Girolami C. Guaraldo R.S. Hayano M. Iliescu T. Ishiwatari M. Iwasaki P. Kienle P. Levi Sandri A. Longoni J. Marton S. Okada D. Pietreanu T. Ponta A. Rizzo A. Romero Vidal A. Scordo H. Shi D.L. Sirghi F. Sirghi H. Tatsuno A. Tudorache V. Tudorache O. Vazquez Doce E. Widmann B. Wuenschek J. Zmeskal

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keywords kaonicfirstx-raysatomcolliderdafnedecaysdetected

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The first observation of the kaonic 3He 3d - 2p transition was made using slow K- mesons stopped in a gaseous 3He target. The kaonic atom X-rays were detected with large-area silicon drift detectors using the timing information of the K+K- pairs of phi-meson decays produced by the DAFNE e+e- collider. The strong interaction shift of the kaonic 3He 2p state was determined to be -2+-2 (stat)+-4 (syst) eV.

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First measurement of kaonic helium-3 X-rays

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