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Ultimo aggiornamento 22 apr 2019
Autore
Francesco Toschi
Sesso M
Esperimento XENON
Tipo Laurea Magistrale
Destinazione dopo il cons. del titolo Dottorato (estero)
Università Universita' Di Bologna
Strutt.INFN/Ente
Bologna
Titolo Study of the Electronic Recoil Background of the XENON1T Experiment
Abstract One of the main protagonists of the Dark Matter quest is the XENON Project at the LNGS laboratory, aiming at the detection of WIMPs. Relying on the experience coming from the previous phases of the Project, the current XENON1T experiment is the first with about 3.2 t of liquid Xenon, with an active volume of the double-phase TPC of about 2 t. It is the first TPC with a tonne-scale active mass and characterized by the lowesr background rates for this kind of experiments. In 2017, with an exposure time of only 34.2 live days, XENON1T set one of the best exclusion limits on the spin-independent WIMP-nucleon interaction cross section. In the first part of this work, I investigate on the possibility that the neutron generator (NG), a neutron calibration source used to characterize the detector response to nuclear recoils (NR), located near the TPC, can be a background source for the detector. By estimating the event rate when the NG is present and when it is not, no difference in the low energy electronic recoil (ER) event rate has been observed. Evaluating the activity of 238U and 232Th in the NG materials, it is possible to estimate the expected NR back- ground induced by radiogenic neutrons coming from it: since it is two order of magnitudes lower than what is expected from other detector materials, it can be considered negligible. In the last part of the thesis, an overview of all the possible ER back- ground sources for the XENON1T detector and its GEANT4 simulation are presented. In particular, the new implementation of the simulation for the double beta decay of 136Xe is discussed. The state-of-art of the matching of Monte Carlo simulations with the real data is shown at the end of the work: the preliminary results show a good knowledge of the ER background in the XENON1T detector.
Anno iscrizione 2016
Data conseguimento 23 mar 2018
Luogo conseguimento Bologna
Relatore/i
Gabriella Sartorelli Marco Selvi Pietro di Gangi 
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