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The structure of $K^-$-condensed hypernuclei, which may be produced in thelaboratory in strangeness-conserving processes, is investigated using aneffective chiral Lagrangian for the kaon-baryon interaction, combined with anonrelativistic baryon-baryon interaction model. It is shown that a largenumber of negative strangeness is needed for the formation of highly dense anddeeply bound state with kaon condensates and that part of the strangenessshould be carried by hyperons mixed in the nucleus. The properties ofkaon-condensed hypernuclei such as the ground state energy and particlecomposition are discussed. Such a self-bound object has a long lifetime and maydecay only through weak interaction processes. Comparison with other possiblenuclear states is also made, such as kaon-condensed nuclei without mixing ofhyperons and noncondensed multistrange hypernuclei. Implications ofkaon-condensed hypernuclei for experiments are mentioned.

Kaon-condensed hypernuclei as highly dense self-bound objects