2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/46831We present a massive Majorana neutrino model and see how it is constrained from the solar and atmospheric neutrino deficit experiments. This model incorporates the seesaw mechanism and Peccei-Quinn symmetry. Its consequence to the neutrinoless double beta decay is also discussed.8pp, Latex, 1 PostScript FigureHigh Energy Physics - Phenomenologytext