GOALS Natural flux of neutrinos with energy E>15GeV (search for point sources of neutrinos) Natural flux of neutrinos with energy E>15GeV (search for point sources of neutrinos) WIMP WIMP Magnetic Monopoles Magnetic Monopoles Diffuse flux of very high energy (E>10 TeV) neutrinos Diffuse flux of very high energy (E>10 TeV) neutrinos
Neutrino events from low hemisphere April 1998 - February 2003, 1038 d, 372 events.
Atmospheric Muon-Neutrinos - With looser cuts, 1998-2002: 372 events. N (>15GeV)/N (>1GeV)~1/7 A higher statistics neutrino sample for Point-Source Search. - MC: 385 ev. Expected (15%BG). Skyplot (galactic coordinates) E_thr ~ 15GeV
Search for fast monopoles ( N = n 2 (g/e) 2 N = = 8300 N g = 137/2, n = 1.33 ~E =10 7 GeV Event selection criteria: hit channel multiplicity - N hi t > 35 ch, upward-going monopole - (z i -z)(t i -t)/( t z ) > 0.45 & o Background - atmospheric muons 90% C.L. upper limit on the flux of fast monopole (994 livedays)
19 Search for High Energy - Cascades NT-200 large effective volume Look for upward moving light fronts. Signal: isolated cascades from neutrino interactions Background: Bremsshowers from h.e. downward muons Final rejection of background by „energy cut“ (N channel ) (BG)
Baikal Absorbtion Length: 22 ± 2 m Scattering Length ~ 30-50 m cos ~ 0.85-0.9 Optical properties
Fiducial volume V g (NT-200) AMANDA II Position of cascade vertex Neutrino Energy, lg(E/ТeV)
UPPER LIMITS ON THE DIFFUSE NEUTRINO FLUX (theoretical and experimental) НТ-200+ км 3
NT200+ commissioned April 2005 1. 3 outer strings were installed 2. New DAQ – final modernization - 2 Underwater PC with Flex DSL modem (1 Mbod), - 2 Underwater PC with Flex DSL modem (1 Mbod), Underwater Ethernet Underwater Ethernet - Synchronization unit - Synchronization unit * time synchronization * time synchronization NT200 outer strings NT200 outer strings * event clusterization * event clusterization 3. New Software DOS -> Linux, Remote control DOS -> Linux, Remote control 4. New 2 cables to shore (2x4 km) 5. Calibration - New bright Laser
A Gigaton (km3) Detector in Lake Baikal. Sparse instrumentation: 91 strings with 12 OM = 1308 OMs effective volume for 100 TeV cascades ~ 0.5 -1.0 km³ muon threshold between 10 and 100 TeV 624 m 280m 70m 120m 208m
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