2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/46706We treat the old problem of the proton-neutron bound state (the deuteron). Using a new concept of incomplete (partial) annihilation process we derive a formula for the binding energy of the deuteron, which does not contain any new constant. Some implications of this new approach are discussed.10 pages, LaTeXHigh Energy Physics - PhenomenologyA new interpretation of the proton-neutron bound state. The calculation of the binding energytext