2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/102362In this paper we study energy centroids such as those with fixed spin and isospin, those with fixed irreducible representations for bosons, in the presence of random two-body and/or three-body interactions. Our results show that regularities of energy centroids of fixed spin states reported in earlier works are more robust than expected.Physical Review C, in pressNuclear Theorytext