The multiconfiguration Dirac-Hartree-Fock (MCDHF) model has been employed to calculate the transition rates between the nine lowest levels of radium. The dominant rates were then used to evaluate the radiative lifetimes. The decay of the metastable 7s7p 3P0 state through 2-photon E1M1 and hyperfine induced channels is also studied.

We study the tapping dynamics of a one dimensional Ising model with symmetric kinetic constraints. We define and test a variant of the Edwards hypothesis that one may build a thermodynamics for the steady state by using a flat measure over the metastable states with several macroscopic quantities fixed. Various types of tapping are compared and the accuracy of this measure becomes quickly excel...

Quenched QCD hadron spectrum is calculated with Wilson’s quark action at β = 5.85 and 6.0 on a 24 × 54 lattice. We discuss the problem of whether we have extracted the mass of the ground state at these β’s without contamination of the excited states. We show that the masses of the first excited states turn out to be consistent with experiment when we are able to obtain the propagators up to the...

We show that N−1 degenerate dark states can be generated by coupling N-fold degenerate ground states and a common excited state with N laser fields. Interferences between light waves with different frequencies can produce laser fields with time-dependent amplitudes, which can induce not only U N non-Abelian vector fields but also the scalar ones for the adiabatic motion of atoms in such laser f...