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The SIDDHARTA collaboration measured kaonic 3He and 4He 3d → 2p X-rays with gaseous targets at the DAΦNE e+e− collider. The 2p-state strong-interaction shifts and widths were precisely determined by using 144 high-resolution silicon drift detectors. The shift of K−4He is in good agreement with theoretical calculations and consistent with the recent experimental result of KEK-PS E570. The shift of K−3He is also determined for the first time. The newly determined widths are in agreement with optical model calculations

Kaonic3He and4He measurements in the SIDDHARTA experiment at the DAΦNE collider

Kaonic³He and⁴He measurements in the SIDDHARTA experiment at the DAΦNE collider