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We report a limit on the ultra-high-energy neutrino flux based on anon-detection of radio pulses from neutrino-initiated particle cascades in theMoon, in observations with the Parkes radio telescope undertaken as part of theLUNASKA project. Due to the improved sensitivity of these observations, whichhad an effective duration of 127 hours and a frequency range of 1.2-1.5 GHz,this limit extends to lower neutrino energies than those from previous lunarradio experiments, with a detection threshold below 10^20 eV. The calculationof our limit allows for the possibility of lunar-origin pulses beingmisidentified as local radio interference, and includes the effect ofsmall-scale lunar surface roughness. The targeting strategy of the observationsalso allows us to place a directional limit on the neutrino flux from thenearby radio galaxy Centaurus A.

A limit on the ultra-high-energy neutrino flux from lunar observations with the Parkes radio telescope