21 Daya Bay θ 13 Lawrence Berkeley National Laboratory Brookhaven National Laboratory 2012 ( 24 ) Daya Bay 2011
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1 21 Daya Bay θ 13 Lawrence Berkeley National Laboratory Brookhaven National Laboratory 2012 ( 24 ) Daya Bay ,, θ 13, sin 2 2θ 13 Daya Bay sin 2 2θ 13 =0.092±0.016(stat)±0.005(syst) [1], 5σ sin 2 2θ 13 =0,, sin 2 2θ 13 Daya Bay,, θ 13,, Daya Bay 2 θ 13 3 θ 12 θ 23, θ 13 Chooz sin 2 2θ 13 < 0.15 [2] 10, θ 13 T2K,, 0.03(0.04) < sin 2 2θ 13 < 0.28(0.34) [3] 1, MINOS, 2 sin 2 (θ 23 ) sin 2 (2θ 13 )= ( ) [4] 2, Double Chooz, sin 2 2θ 13 =0.086 ± 0.041(stat) ± 0.030(syst) [5] 3 Chooz sin 2 2θ 13 10, sin 2 2θ 13,, sin 2 2θ 13 =0, 2.5σ,, 2011, Daya Bay RENO RENO 2011,,, 2011 Daya Bay, 2011, , Daya Bay Daya Bay,, CP, inverted hierarchy 2 CP T2K 3,, Daya Bay (2012 )
2 22, Daya Bay 2011,,,,, , 3 Daya Bay Daya Bay, 230,, 38, Daya Bay [1, 6],, 3.2 Daya Bay Daya Bay 1 Daya Bay Daya Bay, Ling Ao, Ling Ao-II 3 2, 6 Daya Bay, 2 EH1, EH2 1 EH3 3,, 1 3.1, sin 2 2θ 13 P ( ν e ν e )= 1 sin 2 2θ 13 sin 2 (1.27 m 2 31[eV 2 ]L[m]/E ν [MeV]). sin 2 2θ 13 1, 100% 2,, ν e ν µ ν e ν τ, CP 3,, θ 13 sin 2 2θ 13 ν e + p e + + n E e + (E e + E ν 0.8 MeV), 30 µs, (Gd), Gd(n, γ) 8 MeV, 200 1: Daya Bay AD1 6, EH1 3, D1 2 L1 4 Daya Bay, Ling Ao, Ling Ao-II 1: overburden (m.w.e), (Hz/m 2 ), (m) Overburden R µ D1,2 L1,2 L3,4 EH EH EH , Antineutrino Detector; AD 2 veto, Resistive Plate Chamber (RPC) AD 1, EH1 2 AD, EH2 1, EH3 3 6 AD AD1 6
3 23 Automated calibration system Optical reflector at top Photomultipliers (8-inch) Radial shield Mineral oil (Buffer region) Liquid scintillator (Gamma cacher) 0.1% Gd-doped liquid scintillator (Target volume) Optical reflector at bottom 3: Daya Bay 2: AD AD, Daya Bay 2 AD AD 3, 1. Gd-doped liquid scintillator (20 ton) 0.1% Gd Gd-LS, Gd(n, γ) 8 MeV 2. Liquid scintillator (20 ton) Gd Gd-LS LS (Gd-LS) 3. Mineral oil (40 ton) AD, PMT Gd-LS, LS 1 AD PMT 12% AD m,, PMT, 4: ACU veto, AD RPC, AD 3 Automated Calibration Units (ACU) 2 3 ACU,,, 3, AD 3 ACU, AD z r 1 ACU 4 68 Ge (e + ), 214 Am- 13 C (neutron), 60 Co (γ), LED 4 ACU ACU, AD 5, PMT,, AD, (7.5/ E(MeV) + 0.9)%
4 24 4 Daya Bay (Anti-neutrino Detector; AD), (1)Surface Assembly Building(SAB) PMT AD (2) ( ) (3) (4), RPC, (Water Pool; WP) PMT AD, WP,, WP, RPC WP,,,,, EH1 AD1 AD2, EH2 AD3, EH3 AD4-6, (EH1), 11 5 (EH2), (EH3) 2,, AD,,, AD,, AD,,, 4.1 AD AD, Surface Assembly Building(SAB) SAB, 2 AD 5 AD AD, 6, PMT,, 7, PMT AD PMT,, (PMT ladder), PMT,, AD,,, PMT,, PMT 5: SAB AD 6: AD AD, PMT, PMT,,,, PMT PMT, LBNL, AD,, AD, AD3/4 AD5/6,,,, AD1/2, PMT SSV,,,,, AD5/6,, 2 3
5 25 2: EH1 EH2 EH3 AD1 AD2 AD3 AD4 AD5 AD6 AD PMT AD AD WP PMT AD WP LS/MO tank GdLS tank Coriolis mass flow meters ISO tank 7: PMT 4.2 AD, 8 AD, 9 9:,, AD Gd-LS, LS, MO, 3, Gd-LS, 20 ISO, AD ISO, 3kg(20 ) AD GdLS, AD,, AD5/6, AD1 4.3 EH1 (Daya Bay Near Hall) 8: AD Daya Bay, AD, 8 AD 2011, AD,, 24 AD, 10 AD1 EH1 AD1 AD2, EH1(Daya Bay Near Hall), ACU, AD EH1, AD,
6 26 Daya Bay,,, PMT,, PMT,,,, PMT, 1 HV,,, 11: EH1 ( ), ( ) EH2(Ling Ao Near Hall) EH3(Far Hall) 10: EH1 AD1 EH1,, WP,, khz, DAQ,,,,,,, 300Hz 2, DAQ 11,,, , EH1 EH1, EH2,EH3,, AD3 9 EH2,, EH3, 10 AD4-6 EH3 EH3,,, Daya Bay, 12, EH3 EH3, 11,,, RPC , 3 13,
7 27, T2K,, 5 θ Blind 2012,,, 10%,, 1,, θ 13, 3, 2, 5 12: EH3 AD ( ) ( ) 4.4 Deployment plan, 8 AD,, 2 6,, T2K, AD7 AD8,, AD, 6 AD, 2011, T2K, AD 6, 9,,, AD1 AD , EH2 EH3 AD1 AD2 EH1, side-by-side, 4,, EH2 1, EH3 3, 5 1,,, θ 13 (sin 2 (2θ 13 ) 0.1) θ 13, 2,, θ 13,, Daya Bay,,, 3,, θ 13 (sin 2 (2θ 13 ) 0.01),, %,, (blind),,, 5.2 Unblinding,,,,,,,,,, 2
8 28 13:,, EH1, EH2, EH3 sin 2 (2θ 13 ), 3 8 [1] 14,,,, sin 2 2θ 13 =0.092 ± 0.016(stat) ± 0.005(syst), RENO,, RENO [7], 6 Daya Bay, 55, θ 13 θ 13 5σ, 2, θ 13, m 2 21,, Daya Bay, [1] F. P. An et al., Phys. Rev. Lett. 108, (2012). [2] M. Apollonio et al., Eur. Phys. J. C 27, 331 (2003) EH1 EH2 χ σ σ σ sin 2 2θ EH No oscillation Best Fit 14: ( ), ( ), θ 13 [1] [3] K. Abe et al., Phys. Rev. Lett. 107, (2011). [4] P. Adamson et al., Phys. Rev. Lett. 107, (2011). [5] Y. Abe et al., Phys. Rev. Lett. 108, (2012). [6] F. P. An et al., arxiv: [physics.ins-det]. [7] J. K. Ahn et al., arxiv: [hep-ex].
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