FORMATION OF MUONIUM IN CONDENSED NEON

Muon polarization in condensed neon has been studied as a function of the electric and transverse magnetic fields. In solid neon. more than 80% of the muonium forms in a time of less than 1 ns, while in the liq uid phase the observed muonium fraction in a transverse field of 8 G i s 20%. The muonium formation time in the crystalline phase is short in comparison with that in the liquid phase because of the high mobility of excess electrons.