Ultracold atoms can act as one. When a neutrino is born inside such a cloud, it usually slips away unnoticed. But under special conditions, the superradiance effect kicks in: particles don’t fly out randomly but in strict coordination, amplifying each other, just like photons in a laser turn a faint glow into a powerful beam. It was long thought that the nature of atoms disrupts this collective dance. New research shows that properly tuning a cold cloud removes that barrier — much like precision-cutting a crystal turns ordinary material into a laser rod.
If experiments confirm the calculations, scientists will gain a new way to catch and study neutrinos. Bonus: such a mechanism may already be at work in the cores of neutron stars, where neutrinos erupt in collective bursts.
Every second, trillions of neutrinos fly through your body without touching a single atom: they’re so elusive they can pass through entire planets as if through empty space.