2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/46604The use of spin observables to study the semi-leptonic and non-leptonic weak interaction in atoms and nuclei is surveyed. In particular, the use of semi-leptonic neutral current scattering and atomic parity violation to search for physics beyond the Standard Model is reviewed. The status of nuclear parity violation as a probe of the weak N-N interaction is surveyed. Possible atomic and nuclear signatures of parity conserving, time-reversal violating interactions are also discussed.10 pages in revtex, no figuresHigh Energy Physics - PhenomenologyNuclear Theorytext