Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....2.1097a&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
The ULTRA experiment [4] has been designed in the framework of the EUSO project to measure the reflected/diffused signal produced by the EAS impacting on the Earth surface. EUSO will detect the EECRs measuring the fluorescent light produced by the interaction with the Earth atmosphere. With this method, the particle track can be measured together with its relative depth, ˇ but not its absolute position. Cerenkov light associated to the EAS is emitted in a narrow cone and hits the Earth surface, being partially absorb ed and partially diffused. This signal will give an absolute reference for the track, allowing the measurement of the shower maximum and making also easier the separation ˇ between neutrino and hadronic showers. Moreover, Cerenkov light can give an indep endent estimation of the shower energy if the reflectivity of the shower impinging surface is known. The ULTRA detector includes a UV optical device to ˇ collect the Cerenkov light diffused by various surfaces and an array of scintillators to detect, in coincidence, cosmic ray showers. First tests have been done last October in Mont-Cenis (France, 1970 m a.s.l.); next measurement campaign is scheduled for June 2003.
Agnetta Gaetano
Assis Pedro
Berat C.
Biondo Benedetto
Brogueira Pedro
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