An upper limit on the diffuse flux of high energy neutrinos obtained with the Baikal detector NT-96

We present the results of a search for high-energy neutrinos with the Baikal underwater Cherenkov detector NT-96. An upper limit on the diffuse flux of ν e + ν μ + ν μ ̄ of E 2 Φ ν (E)<1.4×10 −5 cm −2 s −1 sr −1 GeV within neutrino energy range 10 4 –10 7 GeV is obtained, assuming an E −2 behavior of the neutrino spectrum

Searches for almost vertically upgoing muons in a Lake Baikal deep-underwater experiment

A method for selecting collisions involving atmospheric neutrinos and resulting in the emission of almost vertically upgoing muons is proposed and implemented by analyzing data from the deep-underwater neutrino telescopes NT-36 and NT-96. On the basis of data collected by the deep-underwater neutrino telescope NT-96 over a 0.192-year operation period, an upper limit has been imposed on the flux of muons that may originate from the annihilation of neutralino pairs in the core of the Earth

In-situ measurements of optical parameters in Lake Baikal with the help of a neutrino telescope

We present results of an experiment performed in Lake Baikal at a depth of about 1 km. The photomultipliers of an underwater neutrino telescope under construction at this site have been illuminated by a distant laser. The experiment not only provided a useful cross-check of the time calibration of the detector, but also allowed to determine inherent optical parameters of the water in a way complementary to standard methods. In 1997, we have measured an absorption length of 22 m and an asymptotic attenuation length of 18 m. The effective scattering length was measured as 480 m. Using = 0.95 (0.90) for the average scattering angle, this corresponds to a geometrical scattering length of 24 (48) m