Description
Directional reconstruction is a powerful tool for background rejection in neutrino experiments, allowing isolation of highly directional sources such as the Sun. While the high light-yield of scintillator provides good energy and position reconstruction, scintillation light is isotropic and does not contain directional information. However, this information might be provided by Cherenkov light, if it could be sufficiently isolated from the overwhelming scintillation signal. While directional Cherenkov information from solar neutrinos has recently been demonstrated on a statistical level, event-by-event reconstruction of direction has, until now, not been achieved in a large-scale liquid scintillator experiment.
In this poster I will outline the initial results of such directional reconstruction in the SNO+ detector, where the slower timing profiles of low concentration fluor can be used to effectively separate the instantaneous Cherenkov signal, leading to a clear peak in emission at the Cherenkov angle. This information can then be used to reconstruct direction of high energy events. Initial results of this method have been extremely successful, with surprisingly good angular resolution for events > 5 MeV.
| Collaboration | SNO+ Collaboration |
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