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At KEK-MSL we have been pursuing the Ultra-Slow Muon Project, in which thermal muonium atoms (designated as Mu; consisting of a μ + and an e - ) are generated from the surface of a hot tungsten foil, placed at the primary 500MeV proton beam line, and ionized by intense lasers synchronized with the emission of Mu. In the 21st century, it will be extended to the intense slow-muon facility...
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