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We present a simple method for obtaining elastic scattering phase shifts andcross sections from energies of atoms or ions in cavities. This method does notrequire calculations of wavefunctions of continuum states, is very general, andis extremely convenient from practical point of view: some conventionalcomputer codes designed for the energies of bound states can be used withoutmodifications. The application of the method is illustrated on an example ofelectron scattering from Kr and Ar. From Brueckner orbital energies in variablecavities, we have obtained ab initio cross sections that are in close agreementwith experiment. The relativistic effects are also considered and found to besmall below 10 eV.Comment: 4 pages, 3 figure

Simple Method for Obtaining Electron Scattering Phase Shifts from Energies of an Atom in a Cavity