The idea to construct a 4π Gamma-Ray Energy Tracking Array was proposed almost 30 years ago. Since then there has been a tremendous amount of technical innovation and progress in detector technology, signal processing, and advanced electronics and computing systems resulting in GRETINA and AGATA (demonstrator). These arrays have been operating in the US and Europe (respectively) for over a decade and have demonstrated the performance and science impact of such arrays.
As of Spring 2025, GRETA, which builds on GRETINA to complete the full 4π array, is nearing completion and to mark this milestone we were pleased to host a 2-day workshop/dedication held at Lawrence Berkeley National Laboratory April 23-24, 2025.
In these two days, we celebrated the evolution of gamma-ray spectroscopy, the technologies which enable the science and the science itself, focusing on more than a decade of physics with GRETINA and looking forward to the next decades of GRETA.