Abstract
New physics opportunities are opening up by the Advanced Gamma Tracking Array, AGATA, as it evolves to the full 4pi instrument. AGATA is a high-resolution gamma -ray spectrometer, solely built from highly segmented high-purity Ge detectors, capable of measuring gamma rays from a few tens of keV to beyond 10 MeV, with unprecedented efficiency, excellent position resolution for individual gamma -ray interactions, and very high count-rate capability. As a travelling detector AGATA will be employed at all major current and near-future European research facilities delivering stable and radioactive ion beams.
Highlights
Nuclear structure studies far from stability are entering into a high-precision era with increased intensities and purity of radioactive ion beams and new methods to produce exotic nuclei using stable beams
Improved efficiency and sensitivity of the instruments are mandatory to focus on essential observables to validate the theoretical predictions and guide future developments, This has led to a continuous improvement of the instrumentation, from the High-Purity Germanium (HPGe) multi-detector arrays of the 1990s (e.g., [1,2] in Europe, Gammasphere [3] in the USA), through the first arrays consisting of segmented HPGe detectors (e.g., MINIBALL [4,5], EXOGAM [6] in Europe, Gammasphere in the USA), to the development of the Advanced Gamma Tracking Array (AGATA) [7], a 4π spectrometer solely built from position-sensitive HPGe detectors
AGATA uses a technique known as γ -ray tracking, which relies on determining every γ -ray interaction point in any of the HPGe detectors so that the whole path of a γ ray can be tracked and used to measure not just the energy, and the angle at which the original γ ray was emitted
Summary
Nuclear structure studies far from stability are entering into a high-precision era with increased intensities and purity of radioactive ion beams and new methods to produce exotic nuclei using stable beams. AGATA is a truly universal high-resolution spectrometer, capable of measuring γ rays from a few tens of keV to beyond 10 MeV, with unprecedented efficiency, excellent position resolution for individual γ -ray interactions and correspondingly unparalleled angular resolution, and very high count-rate capability These features will give rise to a resolving power that is in specific cases up to two orders of magnitude larger than current arrays, and allow AGATA to be operated in diverse environments such as using relativistic beams from the FAIR/Super-FRS facility [11,12], high-intensity ISOL beams from the secondgeneration Radioactive Ion Beam (RIB) facilities (HIEISOLDE [13], SPES [14], SPIRAL2 [15]), and at the highintensity stable beam facilities at GANIL [15], JYFL [16], and LNL [17]. – understanding the microscopic origin of nuclear deformation and the interplay between single-particle and collective degrees of freedom,
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