Letter of Intent: The Accelerator Neutrino Neutron Interaction Experiment (ANNIE)
2015
Neutron tagging in
Gadolinium-doped water may play a significant role in reducing backgrounds from atmospheric
neutrinosin next generation
proton-decaysearches using megaton-scale Water
Cherenkov detectors. Similar techniques might also be useful in the detection of supernova
neutrinos. Accurate determination of neutron tagging efficiencies will require a detailed understanding of the number of neutrons produced by
neutrinointeractions in water as a function of momentum transferred. We propose the Atmospheric
NeutrinoNeutron Interaction Experiment (ANNIE), designed to measure the neutron yield of atmospheric
neutrinointeractions in
gadolinium-doped water. An innovative aspect of the ANNIE design is the use of precision timing to localize interaction vertices in the small fiducial volume of the detector. We propose to achieve this by using early production of LAPPDs (Large Area Picosecond Photodetectors). This experiment will be a first application of these devices demonstrating their feasibility for Water Cherenkov
neutrino detectors.
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