Abstract
The SoLid Collaboration is currently operating a 1.6 ton neutrino detector near the Belgian BR2 reactor. Its main goal is the observation of the oscillation of electron antineutrinos to previously undetected flavour states. The highly segmented SoLid detector employs a compound scintillation technology based on PVT scintillator in combination with LiF-ZnS(Ag) screens containing the 6Li isotope. The experiment has demonstrated a channel-to-channel response that can be controlled to the level of a few percent, an energy resolution of better than 14% at 1 MeV, and a determination of the interaction vertex with a precision of 5 cm. This contribution highlights the major outcomes of the R&D program, the quality control during component manufacture and integration, the current performance and stability of the full-scale system, as well as the in-situ calibration of the detector with various radioactive sources.
Highlights
The Standard Model – the rigorous theory of particle physics, incredibly precise and accurate in its predictions – cannot account for the way massive neutrinos show to behave
The complete detector is enclosed in a shipping container which is surrounded by a 50 cm thick water wall of 28 ton (Fig. 4)
Neutrinos interact with the detector volume via inverse beta decay (IBD), resulting in a positron and a neutron that are correlated in time and space
Summary
The Standard Model – the rigorous theory of particle physics, incredibly precise and accurate in its predictions – cannot account for the way massive neutrinos show to behave. The observed antineutrino rate coming from nuclear reactors shows a clear deficit, in comparison to recent calculations [2]. This reactor antineutrino anomaly (RAA), has been observed by multiple collaborations and over a wide range of distances between detector and reactor core. The SoLid detector is operated as close as 6.4 m to the reactor core. The oscillation probability is dictated by the properties of the neutrino states, namely the mixing angle θee and squared mass difference m214. The SoLid collaboration designed and built a finely segmented neutrino detector, demonstrating a novel detector technology using hybrid scintillators [8]
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