Superradiation of some cold atoms

One describes a procedure to calculate power of spontaneous radiation of several fixed dipole-interacting two-level atoms within the space equal to resonance radiation wavelength. One makes use of the Schroedinger representation. As examples one shows that two atoms can not, while four ones may produce a pulse of superradiation under conditions appropriate to the experiments with cold atoms in dipole trips. One discusses various ways to determine quasi-stationary mixed states of atoms and to extend the described procedure to other resonance radiative systems