Radar detection of the PeV-EeV cosmic neutrino flux
At the highest energies the cosmic neutrino flux drops rapidly and an even larger detection volume than the cubic kilometer of ice currently probed by the IceCube experiment is needed. Due to its long attenuation length, the radio signal provides the ideal means to cover such large volumes. Nevertheless, the direct radio emission from a neutrino induced particle cascade becomes detectable around EeV energies. This leaves a sensitivity gap in the PeV-EeV range. To cover this sensitivity gap, we discuss the radar detection technique as a method to probe the PeV-EeV cosmic neutrino flux. To investigate the feasibility of the radar detection method, in May 2018 a beam test experiment was performed at the Stanford Linear Accelerator Center (SLAC). We present first results of this experiment and discuss the potential of the radar detection technique in detail.