Abstract
A large-volume prototype of a liquid-core fibre detector has been built and installed in the CERN neutrino beam. For the first time high-quality images of neutrino interactions were recorded with such a detector. The analysis presented in this paper is based on a sample of 151 recorded interactions. It aims at evaluating the precision of the neutrino vertex reconstruction, to determine the capability of the technique for the detection of short-lived particles. To gather experience, a small sample of 31 events has been analysed on an event-by-event basis using an interactive track finding program. A non-interactive algorithm has been applied to the complete sample. A reconstruction efficiency of 84% and a vertex resolution of 30 μm (transverse to the beam direction) were achieved. The instrumental impact parameter of the measured tracks relative to the vertex is., on average, 43 μm for interactions in the sensitive part of the detector and 66 μm for events occurring in upstream materials (where the extrapolation distance to the vertex is longer).
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