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), 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
TL;DR
This paper reports the first measurement of X-ray transitions in kaonic helium-3 atoms, providing new data on the strong interaction effects in exotic atoms using advanced detection techniques.
Contribution
It presents the first observation of the kaonic 3He 3d - 2p transition and measures the strong interaction shift of the 2p state.
Findings
Observation of the kaonic 3He 3d - 2p transition
Determination of the strong interaction shift as -2±2 (stat) ±4 (syst) eV
Use of silicon drift detectors and timing from phi-meson decays
Abstract
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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