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The Long Baseline Neutrino Oscillation Experiment (LBNE) is proposed todetermine the neutrino mass hierarchy and measure the CP phase in the leptonicsector. The current design of LBNE Phase I consists of a 10 kt liquid argontime projection chamber (LBNE10). The neutrino-antineutrino asymmetry in theelectron-neutrino appearance probability has contributions from both the CPphase and the matter effect. For this reason, experimental sensitivity to themass hierarchy depends both on the true value of the CP phase and the true masshierarchy; LBNE10 will determine the mass hierarchy at high levels ofsignificance for half of CP phase space. We propose placing a second detectorat an off-axis location. Such a detector will share the same beamline as theprimary LBNE detector. The detector location is chosen such that this detectorfocuses on a measurement of electron (anti-)neutrino appearance at the secondoscillation maximum. We will show that this configuration will enhance theability of LBNE to determine the mass hierarchy and to discover CP violation inthe leptonic sector.

A Second Detector Focusing on the Second Oscillation Maximum at an Off-axis Location to Enhance the Mass Hierarchy Discovery Potential in LBNE10