kaonium
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Kaonium — is an exotic atom consisting of a bound state of a positively charged and a negatively charged kaon. Kaonium has not been observed experimentally and is expected to have a short lifetime on the order of 10 18 seconds [ sect;10.3, Fundamentals in… … Wikipedia
Kaonic hydrogen — is an exotic atom consisting of a negatively charged kaon orbiting a proton.Such particles were first seen, through their X ray spectrum, at the KEK in Tsukuba, Japan. More detailed studies have been performed at DAFNE in Frascati, Italy. Kaonium … Wikipedia
