No abstract available

[en] Muonic molecules have been studied for quite some time in the context of muon catalyzed fusion. The energy levels of these systems have been calculated based on an adiabatic (Born-Oppenheimer) separation of the nuclear and muonic motions. However, there are non-adiabatic terms in the separation that involve electronic matrix elements of the nuclear momentum and kinetic energy. The momentum term contains only off-diagonal elements, however the kinetic energy term contains diagonal elements that enter as energy correction terms. The authors have calculated these terms directly and used them to examine the lowest vibrational states with J = O

[en] The hyperfine (hf) couplings of all the /sup 19/F nuclei in the muonated free radicalxC₆F₆-Mu have been measured using a level-crossing-resonance technique. Slow damped oscillations of the muon spin polarization in a large longitudinal magnetic field or frequency splittings in transverse field occur at particular field values at which there is a near degeneracy in the muon fluorine hf levels. Thus a resonantlike effect is observed in the muon-spin-rotation spectrum as a function of magnetic field. The positions of such level-crossing resonances allow an accurate determination of the magnitude and sign of the fluorine hf parameters relative to the muon hf parameter

No abstract available

[en] A quasiclassical model with no adjustable parameters is proposed for analysis of resonance widths of collinear atom--diatom reactions. We find two important contributions to the widths. One comes from tunneling through adiabatic exit channel barriers. The other involves the stability frequency of resonant periodic orbits. This frequency, if it is imaginary, is a measure of the nonadiabatic coupling in the system. We find that the resonances of the H+HH exchange reaction are determined by this nonadiabatic coupling. The higher lying resonances of the H+MuH system are controlled by the tunneling mechanism. We find that the resonant periodic orbit of the HMuH reaction is stable over a large energy range. The implications of this stability on analysis of quantal computations are discussed in detail

[en] Four individual papers have been cataloged separately

[en] We report here the first investigation of muon decay from muo-molecular states. We present preliminary results for the (dμ^-d)⁺ systems. This may be of importance in the context of fusion by muon catalysis. (author)

[en] Muonium substituted free radicals are formed when spin polarized positive muons are stopped in liquid unsaturated organic compounds. They are observed by muon spin rotation (μSR), i.e. via the time evolution of the muon spin polarization caused by Zeeman and hyperfine interactions. A theoretical treatment of μSR spectra of muonic radicals in zero, intermediate and high external magnetic fields is given. Its predictions are verified by observations on radicals derived from tetramethylethylene and benzene. The relation of μSR to magnetic resonance techniques is discussed. (orig.)

No abstract available

[en] We present a new approach to calculate the resonant energies and Coulombic deexcitation rates of the ddμ^* and ppμ^* exotic ions. The calculations are performed with the method of coupled rearrangement channels, but with a set of basis functions alternative to others. The five lowest-lying states below the xμ(2s) + x(x = p or d) thresholds are observed in the new work. Both sets of calculated Coulombic decay rates are in good accord with the results published in two recent reports, while one set does not agree with the results of another recent report. (author)