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Scintillating fibre detectors combine sub-mm resolution particle tracking,precise measurements of the particle stopping power and sub-ns time resolution.Typically, fibres are read out with silicon photomultipliers (SiPM). Hence, iffibres with a few hundred $\mu$m diameter are used, either they are groupedtogether and coupled with a single SiPM, losing spatial resolution, or a verylarge number of electronic channels is required. In this article we propose andprovide a first demonstration of a novel configuration which allows eachindividual scintillating fibre to be read out regardless of the size of itsdiameter, by imaging them with Single-Photon Avalanche Diode (SPAD) arraysensors. Differently from SiPMs, SPAD array sensors provide single-photondetection with single-pixel spatial resolution. In addition, O(us) or fastercoincidence of detected photons allows to obtain noise-free images. Such aconcept can be particularly advantageous if adopted as a neutrino activetarget, where scintillating fibres alternated along orthogonal directions canprovide isotropic, high-resolution tracking in a dense material and reconstructthe kinematics of low-momentum protons (down to 150 MeV/c), crucial for anaccurate characterisation of the neutrino nucleus cross section. In this workthe tracking capabilities of a bundle of scintillating fibres coupled toSwissSPAD2 is demonstrated. The impact of such detector configuration inGeV-neutrino experiments is studied with simulations and reported. Finally,future plans, including the development of a new SPAD array sensor optimisedfor neutrino detection, are discussed.

Demonstration of particle tracking with scintillating fibres read out by a SPAD array sensor and application as a neutrino active target