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Contributions to Phase Two of AGATA electronics

AuthorsCollado Ruiz, Javier Primitivo
AdvisorGadea, Andrés CSIC ORCID
Issue Date27-Mar-2020
AbstractIn the field of Nuclear Physics, high-resolution gamma ray spectroscopy is an accurate method to perform nuclear structure studies, retrieving the energy and angular distributions from gamma photons emitted in the transition between nuclear states. In order to obtain the nucleus in an excited state, such that will emit gamma-rays, we are forced to collide matter, doing nuclear reactions (in the in-beam spectroscopy) or resort to the radioactive decay (decay spectroscopy). The High Purity Germanium (HPGe) semiconductor detectors have shown to provide good response as gamma-ray detector. As other semiconductor detectors, HPGe produce, with high sensitiveness, a current proportional to gamma ray energies while there are subject to high voltage inverse polarization, in cryogenic conditions. The AGATA (Advanced GAmma Tracking Array) HPGe detector array is a state-ofthe-art detector array for the gamma ray spectroscopy technique in nuclear physics. In order to improve the sensitivity, AGATA HPGe detectors have the outer contact divided in 36 segments in order to determine photon position and energy deposited in each segment. With the interaction energy and position information is possible to reconstruct (Track) the gamma-ray interaction sequence using tracking algorithms. With such technique is possible to maximize the sensitivity of the detector array (energy resolution and P/T) without using part of the detection solid angle for the anti-Compton active shields. In addition to the segmented detectors, the positions sensitive HPGe arrays require sampling electronics with spectroscopic signal-to-noise ratios, which provides the traces to be processed by the Pulse Shape Analysis algorithms. To provide maximum efficiency and sensitivity, the AGATA project aims to construct a 4¿ solid angle detector array. This geometry optimizes as well the information obtained, something that is especially important in experiments using expensiv ...
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