2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/217015Within a wide class of ferromagnetic and antiferromagnetic systems, quantum tunneling of magnetization direction is spin-parity dependent: it vanishes for magnetic particles with half-integer spin, but is allowed for integer spin. A coherent-state path integral calculation shows that this topological effect results from interference between tunneling paths.14 pages (RevTeX), 2 postscript figures available upon requestCondensed Mattertext