Jul 26 – 30, 2010
Montpellier 2 University
Europe/Paris timezone

Study of the performances of the shield and muon veto of the XENON1T experiment.

Jul 27, 2010, 4:50 PM
Amphithéatre Dumontet (Montpellier 2 University)

Amphithéatre Dumontet

Montpellier 2 University

Place Eugene Bataillon, 34095 Montpellier Cedex 5 FRANCE


Dr Marco Selvi (INFN - Bologna)


Presented by M. Selvi on behalf of the XENON1T collaboration. Within the XENON program, we are operating a double-phase TPCs using liquid xenon (LXe) as target material. The current phase, XENON100 installed in the LNGS, is in science mode since the beginning of 2010, with a sensitivity goal of 2 x 10-45 cm2. For the next step, we propose to build a detector with a total mass of 2.4 tons of LXe (1.1 fiducial): XENON1T. The goal is to reduce the background by two orders of magnitude with respect to XENON100, reaching a sensitivity of about 5 x 10-47 cm2. Therefore it is crucial to reduce the external backgrounds: gammas and neutrons from the ambient radioactivity and the most dangerous muon-induced neutrons. A careful study of the shield and muon veto needed by the experiment has been carried on with a full Geant4 MC simulation. Two possibilities for the experimental site are considered: LNGS or LSM. To shield the experiment at LNGS a water tank of 10 m diameter and 10 m height will be necessary; moreover the water will be instrumented with PMTs to act as a Cherenkov muon veto. At LSM (where the muon flux is reduced by about a factor 50 with respect to LNGS , because of its larger rock overburden) a similar result could be achieved with a conventional passive shield and a plastic scintillator muon veto. The results obtained for the two site options are presented in this work.

Primary author

Dr Marco Selvi (INFN - Bologna)

Presentation materials