Abstract
X-ray spectroscopy of hadronic atoms is a powerful method to determine the strong interaction between the hadron and nuclei. At J-PARC, we have conducted two experiments on exotic atoms with a doubly strange hyperon, $\Xi^-$, aiming at the world-first detection of the X rays. One is performed as a byproduct of J-PARC E07 experiment (search for double hypernuclei with hybrid emulsion technique) where $\Xi^-$ is stopped on the emulsion. The other is a dedicated experiment for the detection of $\Xi^-$ Fe atom X rays (J-PARC E03). The preliminary result of E07 and the status of the ongoing analysis for E03 are shown in this article. Future prospects of $\Xi$-atomic X-ray spectroscopy are also discussed.
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