The emission of a proton from the exotic neutron-halo nucleus beryllium-11. A narrow resonance in beryllium-11 suggests its proton emission is a two-step process (red arrows), not an exotic process (black arrow). The inset shows the resonance’s location. Credit: John D. Fox Laboratory, Florida State University Most mass in ...
View more: Near-threshold resonance helps explain a controversial measurement of exotic decay in beryllium-11