1. Search for local neutrino sources at BUST.
M.M. Boliev for BUST Collaboration
Institute for Nuclear Research of the Russian Academy of Sciences
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2. Baksan Underground scintillation telescope (BUST)
Effective depth hg/cm2
17 m
17 m
11 m
the scintillator CnH2n+2 (n ≈ 9)
the total mass of scintillator is 330 t
(3180 counters)
three lower horizontal layers
(the interior) -130 t, 1200 counters
counter's threshold:
inner planes – 8 MeV
outer planes –10 MeV
Angular resolution – 1.5°
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3. First upward-going muon Event: Dec 14 1918 08:31:10
Baksan neutrino experiment is in operation from Dec Registration method: time-of-flight
X – Z view
Y – Z view
t4=45ns
t3=35ns
t2=19ns
t1=8ns
First upward-going muon Event: Dec :31:10
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4. Live time (Dec 1978 ÷ May 2017): 31.05 years
In 1978 ÷ 2000 years two hardware triggers are used in order to reject downward going atmospheric muons. Trigger I covers the zenith angle range 95 ÷ 180 while trigger II selects horizontal muons in the range 80 ÷ The hardware trigger efficiency of 99% has been measured with the flux of atmospheric muons.
Since 2000 no use any hardware triggers.
Live time (Dec 1978 ÷ May 2017): years
Upward-going muons (νμ events): — triggered + non-triggered
Horizontal muons: 592 events , triggered + non-triggered
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5. Events distribution in equatorial coordinates (α,δ)
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6. Events distribution in galactic coordinates (b,l)
Latitude(°)
Longitude(°)
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8. Для получения величины потока от предполагаемого источника необходимо знать эффективную площадь и время наблюдения в этом телесном угле. Распределение времени по склонению:
Non-visible δ≥ +44°
Full time visible δ≤ -46°
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9. Flux limits for AP objects (rc= 5°)
R.A.(°) Dec.(°)
Expect N
Events
μ Flux (cm-2 s-1)
90% C.L.
Gal. C.
265.6°
6.5 5
0.32∙10-14
Crab (NGC 1952)
1.9
0.87∙10-14
Vela X-1 4
0.15∙10-14
SS433
2.8 1
0.63∙10-14
3c 273
2.9
0.52∙10-14
Cen A (NGC 5128)
6.8
Cen X-3
6.3 3
0.11∙10-14
Geminga (SN 437)
2.1 2
1.35∙10-14
Cygnus X-3
0.1
0.99∙10-14
Scorpius X-1
4.2
0.37∙10-14
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10. Search for electron neutrinos associated with gravitational wave events GW and GW (and LVT151012) at the BUST:
( ) counters → 200 tons of LS → 1031 nuclei of 12C
no double-signal events during ±1 day
The electron neutrino fluence upper limit without oscillation and assuming a monochromatic spectrum
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11. Total integrated electron neutrino fluence,
BUST νe: GW150914, GW и LVT151012
Total integrated electron neutrino fluence,
21 МэВ ≤ E ≤ 111 МэВ, dN/dE ~ E-2
I ≤ 5.6·1011 νe/cm2
The electron neutrino luminosity upper limits (without oscillation).
GW150914
L0 = 3.·1061 эрг
GW151226
L0 = 3.5·1061 эрг
LVT151012
L0 = 2.2·1062 эрг
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12. Search for muon neutrinos/antineutrinos associated with gravitational wave events GW150914: no neutrino events in ± 7 days
Total integrated muon neutrino+antineutrino fluence
(without oscillation)
1 GeV ≤ E ≤ 100 GэВ, dN/dE ~ E-2
I ≤ 3631 ν/cm2
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13. Upper limits on neutrino energy fluence from GW150914
dN/dE ~ E-2
E1 = 1 GeV, E2 = 100 GeV
Emin = 1 GeV, Emax = 105 GeV
The muon neutrino+antineutrino luminosity upper limits.
L0 = 6.9·1054 эрг
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15. BNO 50 No local sources of muon neutrinos was found .
Upper limits for some astrophysical objects.
No coincidence or correlations of νμ and νe BUST data with gravitational wave events .
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16. min Seff
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