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Improved Flux Limits for Neutrinos with Energies above 10 22 eV from Observations with the Westerbork Synthesis Radio Telescope

2009; American Physical Society; Volume: 103; Issue: 19 Linguagem: Inglês

10.1103/physrevlett.103.191301

1092-0145

O. Schölten, S. Buitink, J. Bacelar, Róbert Braun, De Bruyn, H. Falcke, K. Singh, B. W. Stappers, R. G. Strom, R. al Yahyaoui,

Neutrino Physics Research

Particle cascades initiated by ultrahigh energy neutrinos in the lunar regolith will emit an electromagnetic pulse with a time duration of the order of nanoseconds through a process known as the Askaryan effect. It has been shown that in an observing window around 150 MHz there is a maximum chance for detecting this radiation with radio telescopes commonly used in astronomy. In 50 h of observation time with the Westerbork Synthesis Radio Telescope array we have set a new limit on the flux of neutrinos, summed over all flavors, with energies in excess of 4x10(22) eV.