Powerful nuclear detector takes first beam, supporting critical US security missions

GRETA, a new gamma-ray detector at Michigan State University’s FRIB, has completed its first characterization run and met key performance goals in beam testing.

The array uses segmented high-purity germanium crystals to track gamma rays in three dimensions, boosting precision in rare-isotope and nuclear structure studies.

GRETA is now moving into regular user operations after successful initial commissioning.

Its high-precision measurements will also support research on stellar element formation, fundamental physics, and U.S. national security missions.