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First measurement of kaonic helium-3 X-rays.
Bazzi, M; Beer, G; Bombelli, L; Bragadireanu, A M; Cargnelli, M; Corradi, G; Curceanu Petrascu, C; d'Uffizi, A; Fiorini, C; Frizzi, T; Ghio, F; Girolami, B; Guaraldo, C; Hayano, R S; Iliescu, M; Ishiwatari, T; Iwasaki, M; Kienle, P; Levi Sandri, P; Longoni, A; Marton, J; Okada, S; Pietreanu, D; Ponta, T; Rizzo, A; Romero Vidal, A; Scordo, A; Shi, H; Sirghi, D L; Sirghi, F; Tatsuno, H; Tudorache, A; Tudorache, V; Vazquez Doce, O; Widmann, E; Wünschek, B; Zmeskal, J.
Phys Lett B ; 697(3-2): 199-202, 2011 Mar 07.
Article in English | MEDLINE | ID: mdl-21633519

ABSTRACT

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

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