Updated Limits on the Ultra-High-Energy Neutrino Flux from the RICE Experiment at the South Pole

Details Updated Limits on the Ultra-High-Energy Neutrino Flux from the RICE Experiment at the South Pole Updated Limits on the Ultra-High-Energy Neutrino Flux from the RICE Experiment at the South Pole

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....3.1337k&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

Scientific paper

We describe an up dated search for ultra-high energy (UHE) neutrinos based on detection of radio-wavelength Cherenkov radiation resulting from neutrinoinduced electromagnetic showers in cold Polar ice. We present upper limits on the UHE ν flux based on analysis of 1999-2001 data. Introduction and methods The RICE experiment has goals similar to the larger AMANDA experiment both seek to measure UHE neutrinos by detection of Cherenkov radiation produced by νl + N → l + N . Whereas AMANDA is optimized for detection of penetrating muons resulting from νµ +N → µ+N , RICE is designed to detect compact electromagnetic cascades initiated by e+ (/e- ): νe (/ν e ) + N → e± + N . As the cascade develops, atomic electrons in the target medium are swept into the forwardmoving shower, resulting in a net charge on the shower front of Qtot ˜ Es e/4; Es is the shower energy in GeV[4]. Such cascades produce broadband Cherenkov radiation for λC hefrieend ov >> rM oliere , the emitting region approximates a point k E- l charge of magnitude Qtot and therefore emits fully coherently; fortuitously, the field attenuation length at such wavelengths ˜1 km. One calculation finds[3] that, for 1 PeV< Eνe , radio detection of cascades becomes more cost-effective than PMT-based techniques. Using calculations presented elsewhere of the expected radio-frequency signal strength due to an electromagnetic shower[10,14], the RICE hardware, reconstruction software and simulation[5], and an initial νe -only analysis based on data taken in August, 2000[6], we now report on an expanded neutrino search based on all data taken in 1999, 2000, and 2001. The RICE experiment presently consists of a 20-channel (16-channel for

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