2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/18139Spontaneous nuclear ortho-para transitions are shown to be possible in hydrogen molecule and molecular ion as due to hyperfine interaction odd-odd relative to the space or spin nuclear coordinate permutations. A part of this interaction inversely proportional to the first power of nuclear mass is found for hydrogen molecular ion.7 pagesSoft Condensed Mattertext