Deep pionic bound states in a nonlocal optical potential.

Abstract

Pion-nucleus bound states are investigated in momentum space using a microscopic optical potential with energy dependences and nonlocalities arising from elementary potential models. We confirm the existence of deep, hybrid Coulomb-nuclear 1s, 2s, and 2p bound states, but find them to be considerably broader (\ensuremath{\sim}20--300 %) than reported previously for other potentials and slightly (\ensuremath{\sim}7%) more bound. Although the states still remain nonoverlapping, their larger widths may affect experimental searches.