EXO-200 resumes its underground quest

The upgraded experiment aims to discover if neutrinos are their own antiparticles. Science is often about serendipity: being open to new results, looking for the unexpected. The dark side of serendipity is sheer bad luck, which is what put the Enriched Xenon Observatory experiment, or EXO-200, on hiatus for almost two years. Accidents at the Department of Energy's underground Waste Isolation Pilot Project (WIPP) facility near Carlsbad, New Mexico, kept researchers from continuing their search fo...