Spurious center-of-mass mode as an $S$-matrix pole within the Jost-random-phase approximation

Abstract

Within the Jost-random-phase approximation (Jost-RPA), the spurious center-of-mass mode is a zero of the Jost determinant and hence a pole of the $S$ matrix. A zero at zero excitation energy $E$, whether from self-consistency or from a calibration of the residual interaction, is a pole of exactly second order when it has a single independent solution, every unoccupied bound orbital lies above the holes, and each hole is paired with every allowed partial wave; the order follows from the position of the zero, not from self-consistency. The state of this double pole, given by the Autonne-Takagi factorization of its $E^{-2}$ coefficient, is the zero-energy solution normalized by its inertia. In a self-consistent model of one energy density of the neutron and proton densities, every physical $S$-matrix element continued to $E=0$ carries the $E^{-2}$ term, contrary to an earlier conclusion. Subtracting the mode's principal part from the response changes the strength at real $E\neq0$ only through the smoothing and, in such a model, coincides with the projection of the ideal spurious state. In uncalibrated Woods-Saxon models of $^{16}$O and $^{208}$Pb the mode is a pair of poles on the imaginary axis.