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We present the first images of the pulsar wind nebula (PWN) MSH 15-52 in thehard X-ray band (>8 keV), as measured with the Nuclear Spectroscopic TelescopeArray (NuSTAR). Overall, the morphology of the PWN as measured by NuSTAR in the3-7 keV band is similar to that seen in Chandra high-resolution imaging.However, the spatial extent decreases with energy, which we attribute tosynchrotron energy losses as the particles move away from the shock. Thehard-band maps show a relative deficit of counts in the northern region towardsthe RCW 89 thermal remnant, with significant asymmetry. We find that theintegrated PWN spectra measured with NuSTAR and Chandra suggest that there is aspectral break at 6 keV which may be explained by a break in thesynchrotron-emitting electron distribution at ~200 TeV and/or imperfect crosscalibration. We also measure spatially resolved spectra, showing that thespectrum of the PWN softens away from the central pulsar B1509-58, and thatthere exists a roughly sinusoidal variation of spectral hardness in theazimuthal direction. We discuss the results using particle flow models. We findnon-monotonic structure in the variation with distance of spectral hardnesswithin 50" of the pulsar moving in the jet direction, which may imply particleand magnetic-field compression by magnetic hoop stress as previously suggestedfor this source. We also present 2-D maps of spectral parameters and find aninteresting shell-like structure in the NH map. We discuss possible origins ofthe shell-like structure and their implications.

High-Energy X-ray Imaging of the Pulsar Wind Nebula MSH~15-52: Constraints on Particle Acceleration and Transport