The study of the $\overline{K}N$ system at very low energies plays a key role for the understanding of the strong interaction between hadrons in the strangeness sector. At the DAΦNE electron–positron collider of Laboratori Nazionali di Frascati we studied kaonic atoms with $Z=1$ and $Z=2$, taking advantage of the low-energy charged kaons from Φ-mesons decaying nearly at rest. The SIDDHARTA experiment used X-ray spectroscopy of the kaonic atoms to determine the transition yields and the strong interaction induced shift and width of the lowest experimentally accessible level (1s for H and D and 2p for He). Shift and width are connected to the real and imaginary part of the scattering length. To disentangle the isospin dependent scattering lengths of the antikaon–nucleon interaction, measurements of $K^{-}p$ and of $K^{-}d$ are needed. We report here on an exploratory deuterium measurement, from which a limit for the yield of the K-series transitions was derived: $Y(K_{\mathit{tot}})<0.0143$ and $Y(K_{\alpha })<0.0039$ (CL 90%). Also, the upcoming SIDDHARTA-2 kaonic deuterium experiment is introduced.

的研究 $\overline{钾}N$极低能量的系统对于理解奇异扇区中强子之间的强相互作用起着关键作用。在Laboratori Nazionali di Frascati 的DAΦNE 电子-正电子对撞机上，我们研究了kaonic 原子$Z=1$ 和 $Z=2$，利用来自Φ介子的低能量带电介子几乎在静止时衰减。SIDDHARTA 实验使用 kaonic 原子的 X 射线光谱来确定跃迁产率和强相互作用引起的最低实验可及能级的位移和宽度（H 和 D 为 1s，He 为 2p）。位移和宽度与散射长度的实部和虚部有关。为了解开反光子-核子相互作用的同位旋相关散射长度，测量${钾}^{-}磷$ 和 ${钾}^{-}d$需要。我们在此报告了探索性的氘测量，从中得出了 K 系列跃迁产率的限制：$是({钾}_{\mathit{总}})<0.0143$ 和 $是({钾}_{\alpha })<0.0039$(CL 90%)。此外，还介绍了即将进行的 SIDDHARTA-2 kaonic 氘实验。