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] 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.)

[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)

No abstract available

[en] A theoretical study of the muon spin relaxation of the gaseous muonated ethyl radical C₂H₄Mu is expanded in this paper to include both longitudinal and transverse signals. This study is based upon an operator expansion of the spin-density operator for the radical with its time dependence described by the linearized quantum Boltzmann equation. Relaxation is due to collisions which reorient the radical close-quote s rotational angular momentum while effects on the muon close-quote s spin are due to couplings between the muon close-quote s spin, the radical close-quote s free-electron spin, and the radical close-quote s rotational angular momentum. The coefficients of the radical close-quote s spin Hamiltonian and the collisional lifetimes (cross sections) are used as fitting parameters to describe the transverse signals. A fit to the transverse data by itself and a global fit to both the transverse and longitudinal data are obtained with good accuracy. copyright 1996 The American Physical Society