MODELO DE PARTICULA UNICA SINGLE-PARTICLE MODEL 3 FIELD THEORIES 2 TEORIAS CAMPO 2 ACOPLAMEINTO 1 CONSTANTES DE ACOPLAMIENTO 1 COUPLING 1 COUPLING CONSTANTS 1 ESPURIOS 1 FONONES 1 FUNCION DE ONDA 1 LEAD 208 1 NUCLEAR THEORY 1 PLOMO 208 1 Properties of single particles states in the 208 Pb region 1 SPURIONS 1 TEORIA NUCLEAR 1 The renormalization of single-particle states in nuclear field theory 1 Treatment of the spurious states in nuclear field theory 1 WAVE FUNCTIONS 1