Abstract
The SIDDHARTA experiment measured X-rays from kaonic helium atoms using, for the first time, gaseous 3He and 4He targets. Clear patterns of the L-series X-rays of kaonic 3He and 4He atoms were observed. By using accurate Monte Carlo simulations, the absolute yields of these X-ray transitions were determined to be Y(3d → 2p) = 25.0 +6.7−5.8 % for 3He (0.96 g/l), Y(3d → 2p) = 23.1 +6.0−4.2 % for 4He (1.65 g/l), and Y(3d → 2p) = 17.2 +2.6−9.5 % for 4He (2.15g/l). In addition, the yields Y (nd → 2p), with n > 3 were also determined. The measured yields provide valuable information for understanding the cascade processes of kaonic helium atoms as a function of the target density.
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Communicated by P. Salabura
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The SIDDHARTA Collaboration., Bazzi, M., Beer, G. et al. L-series X-ray yields of kaonic 3He and 4He atoms in gaseous targets. Eur. Phys. J. A 50, 91 (2014). https://doi.org/10.1140/epja/i2014-14091-0
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DOI: https://doi.org/10.1140/epja/i2014-14091-0