Muon transfer in hydrogen isotopic mixtures

Direct and inverse muon transfer between atomic orbitals of muonic hydrogen isotopes is considered in the WKB approximation. The corresponding cross sections, calculated as a function of collision energy, are different above the thresholds for the inverse transfer and approach common limits depending on the principal quantum number and hydrogen isotopes. The comparison of results obtained by integration over impact parameter and by summation over angular momentum is also presented. (author)