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Extra resources for A Deep-Sea Telescope for High-Energy Neutrinos - ANTARES Collaboration
5 GeV2 and x down to 2 × 10−2 at Q2 = 5000 GeV2 . These measurements can be translated into a neutrino-nucleon interaction cross-section at Eν ≃ 50 TeV and can also be used as a guide to extrapolate the parton densities beyond the measured ranges in x and Q2 to those required for higher neutrino energies. 2 shows the behaviour of the average νN crosssection for different sets of parton distribution functions. At very high energy, the cross-section calculated with the new parton distribution functions (CTEQ3- 27 DIS ) is more than a factor of 2 larger than previous estimates.
In December 1997, measurements were performed with a 33 m long rigid structure holding a collimated and continuous LED source located at a variable distance from an optical module. For each selected distance D between the source and the detector, the LED luminosity ΦLED was adjusted so as to yield a constant 44 current IPMT on the photomultiplier tube. The set-up was calibrated with a similar experiment done in air. The emitted and detected intensities in water being related by IPMT ∝ ΦLED /D2 × exp(−D/λatt.
It is assumed that they were produced shortly after the Big Bang and would have cooled down to very low velocities (β ≤ 10−3 ). They may be at the origin of baryon number violating processes  and have been searched for in proton decay experiments. The best limits to date are provided by the MACRO  and BAKSAN  experiments. In the region 10−4 ≤ β ≤ 10−3 , they have achieved sensitivity below the Parker bound . Baikal has obtained limits which could be comparable with a limited number of photomultipliers (36 and 192) .