The Lake Baikal neutrino experiment: selected results

We review the present status of the lake Baikal Neutrino Experiment and present selected physical results gained with the consequetive stages of the stepwise increasing detector: from NT-36 to NT-96. Results cover atmospheric muons, neutrino events, very high energy neutrinos, search for neutrino events from WIMP annihilation, search for magnetic monopoles and environmental studies. We also describe an air Cherenkov array developed for the study of angular resolution of NT-200.Comment: 25 pages, 12 figures. To appear in the Procrrdings of International Conference on Non-Accelerator New Physics, June 28 - July 3, 1999, Dubna, Russi

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

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