GRETA: Status and physics potentials

A gamma-ray tracking detector is a new concept for a detector array composed of highly segmented Ge detector elements. The detector would give the energy and the position of all the interaction points and by using the angle-energy relation of the Compton scattering, the scattering sequence of the gamma rays can be reconstructed. Such a detector will have a high efficiency and a good peak-to-background ratio. Research and development are being carried out in the production of highly segmented Ge detectors, understanding the signal, and development of tracking algorithms. Recent progress indicated that this type of detector system appears to be feasible and would have a large impact on a wide variety of physics.