Background light in potential sites for the ANTARES undersea neutrino telescope

Citation
P. Amram et al., Background light in potential sites for the ANTARES undersea neutrino telescope, ASTROPART P, 13(2-3), 2000, pp. 127-136
Citations number
5
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
ASTROPARTICLE PHYSICS
ISSN journal
0927-6505 → ACNP
Volume
13
Issue
2-3
Year of publication
2000
Pages
127 - 136
Database
ISI
SICI code
0927-6505(200005)13:2-3<127:BLIPSF>2.0.ZU;2-4
Abstract
The ANTARES collaboration has performed a series of in-situ measurements to study the background light for a planned undersea neutrino telescope. Such background can be caused by K-40 decays or by biological activity. We repo rt on measurements at two sites in the Mediterranean Sea at depths of 2400 m and 2700 m, respectively. Three photomultiplier tubes were used to measur e single counting rates and coincidence rates for pairs of tubes at various distances. The background rate is seen to consist of three components: a c onstant rate due to K-40 decays, a continuum rate that varies on a time sca le of several hours simultaneously over distances up to at least 40 m, and random bursts a few seconds long that are only correlated in time over dist ances of the order of a meter. A trigger requiring coincidences between nea rby photomultiplier tubes should reduce the trigger rate for a neutrino tel escope to a manageable level with only a small loss in efficiency. (C) 2000 Elsevier Science B.V. All rights reserved.