2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/82521Phenomenological and theoretical aspects of fragmentation for elementary particles (resp. nuclei) are discussed. It is shown that some concepts of classical fragmentation remain relevant in a microscopic framework, exhibiting non-trivial properties of quantum relativistic field theory (resp. lattice percolation). Email contact: pesch@amoco.saclay.cea.frSaclay-T93/075 Email: pesch@amoco.saclay.cea.frNuclear TheoryHigh Energy Physics - Phenomenologytext