Gamma-Ray Tracking Array (GRETA)

GRETA, a new high-resolution gamma-ray detector system that will be used at FRIB, has passed an important project milestone — Critical Decision-3a (CD-3a) approval by the U.S. Department of Energy Office of Science. CD-3a approves the start of civil construction and long-lead procurements.

Science it will enable

The Gamma-Ray Tracking Array (GRETA) is designed to reveal new details about the structure and inner workings of atomic nuclei, and to elevate our understanding of matter and the stellar creation of elements. GRETA will be combined with the existing detector array — the Gamma-Ray Energy Tracking In-beam Nuclear Array (GRETINA) — to create a full spherical array. Lawrence Berkeley National Laboratory (LBNL) has had a leadership role in the creation of GRETINA and now GRETA.

The GRETA detector array will incorporate 12 GRETINA detector modules. The GRETA detector array is designed to surround samples, forming a spherical shell to more completely and precisely measure the energy and 3D position of gamma rays propagating in the detectors. Gamma rays are highly penetrating, highly energetic forms of light that are emitted from excited nuclear states.

For more information, visit greta.lbl.gov.

Collaborations

A collaboration of scientists from Lawrence Berkeley National Laboratory, Argonne National Laboratory, MSU, Oak Ridge National Laboratory, and Washington University designed and constructed GRETINA. GRETINA was the first stage of GRETA.

Photos

A rendering of the Gamma-Ray Energy Tracking Array (GRETA). (Credit: Lawrence Berkeley National Laboratory)

A rendering of the Gamma-Ray Energy Tracking Array (GRETA). (Credit: Lawrence Berkeley National Laboratory)