2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/82561The time independent mean field method (TIMF) for the calculation of matrix elements of non relativistic propagators is based on a variational principle whose non linearity induces a multiplicity of variational solutions. Several of them can break any symmetry shared by the Hamiltonian and initial and final states. We describe a soluble model where, in particular, time reversal and parity breakings occur. Such breakings account for important properties of propagation amplitudes.8 pages, latex (admin comment: figures omitted by author)Nuclear Theorytext