Abstract
The ICARUS T600 detector has proven the effectiveness of Liquid Argon TPC technology with a successful three-year long run at the INFN Gran Sasso National Laboratories (LNGS).ICARUS T600 LNGS data strongly contributed to the global effort in searching for neutrino oscillations mediated by sterile states. A definitive clarification of the sterile neutrino puzzle will come from the new multi-station, Short Baseline Neutrino (SBN) experiment at the Booster Neutrino Beam (BNB) at Fermilab, where a refurbished T600 will act as Far Detector.Presently the T600 detector is located at CERN, undergoing a major overhauling which will allow its participation in the 5 years program of the Fermilab upcoming SBN project. Moreover, ICARUS T600 is also foreseen to collect data with the NUMI Beam to be later exploited in the wider picture of the DUNE Long-Baseline project, recently undertaken by the United States community.This contribution will report the present physics results obtained by the ICARUS Collaboration, as well as describe the overhauling activities and the physics program for the detector in its future deployment at Fermilab.
Highlights
The ICARUS T600 detector has proven the effectiveness of Liquid Argon Time Projection Chamber (TPC) technology with a successful three-year long run at the INFN Gran Sasso National Laboratories (LNGS)
A definitive clarification of the sterile neutrino puzzle will come from the new multi-station, Short Baseline Neutrino (SBN) experiment at the Booster Neutrino Beam (BNB) at Fermilab, where a refurbished T600 will act as Far Detector
During the LNGS run a search was performed for non-standard νμ → νe oscillations driven by supposed sterile neutrino states, but no evidence of oscillation was observed
Summary
The ICARUS T600 detector is the largest operational Liquid Argon (LAr) Time Projection Chamber (TPC) built so far [1, 2]. The measured drift time, combined with the electron drift velocity (vD = 1.59 mm/μs at E = ED), provides the event coordinate in the drift direction; the composition of the three views from the TPC wires instead yields the track position in the anode plane Matching these pieces of information allows obtaining a full 3D reconstruction of the tracks, with a precision of few mm. Continuous gas (2.5 m3/h) and liquid (100 m3/d) recirculation, as well as standard commercial Hydrosorb/Oxysorb filters, were used to reduce the concentration of electronegative impurities (O2, N2, H2O): this has to be kept far below the value of 0.1 ppb - O2 equivalent, to ensure ionization charges travel through the entire drift volume Such system allowed obtaining, during the LNGS run, an average electron life-time > 7 ms (max charge attenuation along the drift: 12%), and a maximum value of 16 ms (with a new liquid pump), which translates into an impurity concentration lower than 20 ppt O2 equivalent, as shown in figure 1 [3]. Such feature ensures negligible contamination of π0’s from NC (Neutral Current) and νμCC in selected νe-event samples, which is fundamental for the searches of non-standard νμ → νe oscillations
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