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Alec Aivazis added nova-detectors.tex
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\subsection{The Detectors} \label{sect:detectors}
NO$\nu$A features two detectors in order to reduce uncertainties in neutrino flux, cross section, and event selection efficiencies \cite{Kopp_2004}. The Near Detector is in a cavern close to the existing MINOS Near Detector Hall at Fermilab and is made up of a 206 layers of a lattice made up of highly reflective PVC filled with liquid scintillator. As the neutrino passes through the liquid, it decays and produces a flash of flash. This flash of light is collected and transmitted to the end of the call by a specially designed fiber optic cable. The far detector uses similar technology but is considerly bigger, with 928 layers of PVC 15.6m wide. See figure \ref{fig:detectors} for size comparison. The cells that make up these layers are designed to make it easier to detect $\pi^0$ decays by using the gap between the position where the nuetrino interacted with the liquid and the photon was recorded \cite{Patterson_2012}.
The Far Detector is located 14 mrad off of the NuMI beam axis, exposing the measurements to a relatively narrow band of neutrino flux centered around 2 GeV, the maximum probability for a neutrino to oscillate \footnote{See sections \ref{sect:flux} and \ref{sect:osc-theory} for more information}. The relation between neutrino flux and energy is summarized in figure \ref{fig:flux-energy}. While the flux is maximized on-axis, peaked at 7 GeV, the sharpness of the peak around 2 GeV gives a much higher certainty when performing measurements as mentioned before and in section \ref{sect:flux} \cite{Patterson_2012}.
