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2-ν
P(νe↔νe) = 1 – sin22ϑsin2(1.27Δm2L/E)
Preliminary
Choji Saji
NOON2004
Атмосферные нейтрино
KEK-
12GeV PS
Super-Kamiokande
L=250 km
Takanobu Ishii
NOON2004
Null oscillation probability: less than 1%
Δm2=1.5~3.9 x 10-3 eV2 @sin22θ=1(90%CL)
80.1
+6.2
-5.4 exp
56obs
reconstructed Eν
Эксперимент SNO
Kevin Graham
NOON2004
Q = 2.22 MeV
measures total 8B ν flux from the Sun
equal cross section for all ν types
low statistics
mainly sensitive to νe, some νμ and ντ
strong directional sensitivity
Kevin Graham
NOON2004
Эксперимент SNO
99.95 % C.L.
BOTH:
Steel/Scintillator sandwiches
2.54 cm steel + 1 cm scint
Magnetized ~1.5T
55%/√E hadrons
23%/√E electrons
Эксперимент MINOS
N. Tagg
NO-VE 2003
Эксперимент MINOS
N. Tagg
NO-VE 2003
νμ CC Events/kt/3.7e20pot
Low Medium High
440 1040 2170
νμ CC Events/MINOS/7.4e20pot
Low Medium High
4760 11300 23400
3.7x1020 protons on target/year
requires 4x1013 protons/2.0 seconds
Osc. Max. for Δm2 = 0.002 eV2