2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/43572Models in which the "dark" halo particles have mutual and potentially also appreciable nuclear interactions have been considered by various authors. In this note we briefly point out strategies for a most sensitive search for these particles. We show that a particular matter/anti-matter symmetric variant due to Farrar et al. is excluded by combining bounds on proton decay from various experiments and from super-Kamiokande and atmospheric neutrino measurements at super-Kamiokande.16 pages, cross reference with AstrophysicsHigh Energy Physics - Phenomenologytext