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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...
The kaonic helium-4 3d→2p X-ray transition was measured in a gaseous target, where Compton scattering in helium is negligible. The X-rays were detected with large-area Silicon Drift Detectors (SDDs) using the timing information of the K+K− pairs produced by ϕ decays at the DAΦNE e+e− collider. A new value of the strong interaction shift of the kaonic 4 He 2p state was determined to be 0±6...
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