  Bound states in monopoles are studied through a simplified, Witten-like
model. As the overall structure is determined in full details, it is shown in
particular that only those states having a vanishing angular momentum are
allowed; for those, the energy spectrum is derived numerically and an
approximation is set up that allows an easy description in terms of
wavefunctions, usefull for further applications. The monopoles are then
proposed as candidates of ultra high energy cosmic rays, an hypothesis that
should soon be testable through the Pierre Auger Observatory.
