Today at Berkeley Lab

Hunting for High-Energy Cosmic Rays With IceCube

Very rare cosmic rays reach particle energies tens of millions of times greater than the Large Hadron Collider can achieve on Earth. There are two good candidates for natural accelerators of cosmic rays and associated neutrinos packing that kind of wallop, and the IceCube neutrino telescope at the South Pole, to which Berkeley Lab is a key contributor, has just dumped very cold water on one of them: gamma-ray bursts (GRBs). “We would have expected to see 8.4 events corresponding to GRB production of neutrinos,” says Spencer Klein of the Nuclear Science Division. “We didn’t see any” – deepening the cosmic-ray mystery. More>