2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/83117The interest, the status and the perspectives of various experiments in neutron and nuclear beta-decay, muon-decay and pion-decays are discussed. The talk is segmented into a discussion of the decay-rates and of the energy-spectra and correlations. The impact on various scenarios of "new physics" is briefly mentioned; left-right symmetric models are discussed in more detail and the informations gained from the considered experiments is compared to those from other sources.16 pages, 4 encapsulated Postscript figures, uses sprocl.sty (included), to appear in the WEIN98 ProceedingsNuclear TheoryHigh Energy Physics - PhenomenologyNuclear Experimenttext