CUORE (Cryogenic Underground Observatory for Rare Events (CUORE, Italian for “heart”)) is an experiment to search for neutrinoless double beta decay in 130 Tellurium. CUORE will study the possible 0νββ decay of 130 Te with a sensitivity to a half life of 2.1×10 26 yr (68% C.L.), which corresponds to an effective neutrino mass of less than 24 − 81 meV. The primary physics goal of CUORE is to determine whether 0νββ occurs and, if so, to determine the half-life of the process, the Majorana/Dirac nature of the neutrino, the neutrino mass scale, and mass hierarchy.
GRETINA is a new type of gamma-ray detector to study the structure and properties of atomic nuclei. It is built from large crystals of hyper-pure germanium and will be the first detector to use the recently developed concept of gamma-ray energy tracking. GRETINA consists of 28 highly segmented coaxial germanium crystals organized into 7 modules. Each crystal is segmented into 36 electrically isolated elements and four crystals are combined in a single cryostat to form a quad-crystal module. GRETINA is the first stage of the full Gamma-Ray Energy Tracking Array (GRETA).
GRETA (Gamma-Ray Energy Tracking Array), the 4π γ-ray tracking array, will be a powerful instrument needed to accomplish a broad range of experiments that will play an essential role in addressing the intellectual challenges of low-energy nuclear science. GRETA marks a major advance in the development of γ-ray detector systems and can provide order-of-magnitude gains in sensitivity compared to existing arrays. It uses highly-segmented hyper-pure germanium crystals together with advanced signal processing techniques to determine the location and energy of individual γ-ray interactions, which are then combined to reconstruct the incident γ-ray in a process called tracking.