Search for a diffuse flux of high-energy extraterrestrial neutrinos with the NT200 neutrino telescope

• DOI: 10.1016/j.astropartphys.2005.12.005
• Publication Date: 2006-01-18T20:23:45Z
• Authors: V. Aynutdinov; V. Balkanov; I. Belolaptikov; L. Bezrukov; D. Borschov; N. Budnev; A. Chensky; I. Danilchenko; Ya. Davidov; G. Domogatsky; A. Doroshenko; A. Dyachok; Zh.-A. Dzhilkibaev; S. Fialkovsky; O. Gaponenko; O. Gress; T. Gress; O. Grishin; A. Klabukov; A. Klimov; S. Klimushin; K. Konischev; A. Koshechkin; L. Kuzmichev; V. Kulepov; B. Lubsandorzhiev; S. Mikheyev; T. Mikolajski; M. Milenin; R. Mirgazov; E. Osipova; A. Pavlov; G. Pan’kov; L. Pan’kov; A. Panfilov; Yu. Parfenov; D. Petukhov; E. Pliskovsky; P. Pokhil; V. Poleschuk; E. Popova; V. Prosin; M. Rozanov; V. Rubtzov; Yu. Semeney; B. Shaibonov; A. Shirokov; Ch. Spiering; B. Tarashansky; R. Vasiliev; E. Vyatchin; R. Wischnewski; I. Yashin; V. Zhukov
• Keywords: Astrophysics (astro-ph); 0103 physical sciences; FOS: Physical sciences; Astrophysics; 01 natural sciences

19 pages, 23 figures, submitted to Astroparticle Physics<br/>We present the results of a search for high energy extraterrestrial neutrinos with the Baikal underwater Cherenkov detector NT200, based on data taken in 1998 - 2002. Upper limits on the diffuse fluxes of $��_e+��_��+��_��$, predicted by several models of AGN-like neutrino sources, are derived. For an $E^{-2}$ behavior of the neutrino spectrum, our limit is $E^2 ��_��(E)<8.1 10^{-7} cm^{-2} s^{-1} sr^{-1} GeV$ over an neutrino energy range $2 10^4 - 5 10^7 GeV$. The upper limit on the resonant $\bar��_e$ diffuse flux is $��_{\bar��_e}< 3.3 10^{-20} cm^{-2} s^{-1} sr^{-1} GeV^{-1}$.<br/>