1. Introduction. Whether there exist kaonic nuclei or not is a key issue to make our understandings on theKN interaction in vacuum and in nuclear medium. The information on theKN interaction has been obtained by analyzing low-energyKN scattering data and kaonic-atom X-ray data [1]. The recent measurement of the energy shift and width on kaonic-hydrogen X-ray in high precision by the SIDDHARTA group [2] has contributed a lot [3]. From the theoretical analyses by using these results, it is well known that theKN
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