MUONIUM DIFFUSION IN DIRTY SOLID KRYPTON

Muonium spin dynamics in solid krypton in the presence of deliberately introduced impurities has been studied in the temperature range from 2 K to 115 K. At temperatures up to 40 K, muonium transverse relaxation rate turns out to be virtually unaffected by impurities. This implies that the Mu energy level shifts in the neighboring wells induced by impurities are smaller than the characteristic Mu activation energy in the one‐phonon regime of quantum diffusion.