The reactor antineutrino anomaly and sterile neutrino Experiment

The reactor antineutrino anomaly and sterile neutrino Experiment NEUTRINO-4 search for sterile neutrino at WWR-M reactor and SM-3 reactor Asymmetry of our world Coexistence is possible, transitions are complicated. =? coexistence mirror world R Anatolii Serebrov L (PNPI, Gatchina, Russia) L for collaboration 6 10 -10 world mirror particles mirror antiparticles annihilation!! Coexistence is not possible R mirror antiworld PNPI(Gatchina)-KIAE(Moscow)-RIAR( Dimitrovgrad) -IHEP(Protvino) NEUTRINO-4 experiment Preparation at WWR-M reactor (17 MW) in PNPI (Gatchina) Project NEUTRINO-4 experiment at 100 MW SM-3 reactor Dimitrovgrad (Russia) test of shielding Reactor power - 17 MW Size of active core – 0. 6 m Pb shielding PNPI, Gatchina A. P. Serebrov, A. K. Fomin, V. G. Zinoviev, V. G. Ivochkin, V. A. Solovey, R. M. Samoilov, A. V. Chernyi, E. I. Malyutenkov, Yu. E. Loginov, M. S. Onegin, A. M. Gagarsky, G. A. Petrov, O. M. Zherebtsov, reactor on without shielding reactor off without shielding reactor on/off with shielding «Kurchatov Institute» , Moscow V. P. Martemyanov, V. G. Zinoev, V. G. Tarasenkov, V. I. Alyoshin hall walls reactor antineutrino detector combined shielding from and n cable channels rails motor for detector movement RIAR, Dimitrovgrad A. L. Petelin, S. V. Pavlov, M. N. Svyatkin, A. L. Izhutov, S. A. Sazontov, D. K. Ryazanov, M. O. Gromov, N. S. Khramkov PMT borated polyethylene shielding 16 cm one detector section with scintillator anticoincidence plastic shielding with PMT Reactor: SM-3 reactor in Dimitrovgrad (Russia): 100 MW compact core (35 x 42 cm 3) 2. 5 m 3 detector: 5 sections moveable detector at 6 -12 m detector 5 m core Installation of 2 sections test antineutrino detector with liquid scintillator (total volume 0. 4 m 3) sensitivity area 1 year 95% CL IHEP, Protvino V. I. Ryikalin Installation of anticoinsidence shielding from plastic scintillator 0. 5 x 0. 125 m 3 with PMT (32 pieces) SM-3 reactor Model of neutrino detector at WWR-M reactor Liquid scintillator ВС-525 400 liters Experimental scheme at SM-3 reactor Reactor power 100 MW, Size of reactor core 35 х 42 см 3, minimal distance 5 m, experimental base from 5 m to 13. 5 m Detector with active shielding 4 Sizes of reactor cores and power Size of SM-3 reactor core: 42 42 35 сm 3 antineutrino detector SМ-3 5 m ВВЭР-1000 100 MW 60 MW 85 MW 20 MW reactor core 250 MW 2700 MW Filling by liquid scitillator reactor core 3000 MW installation of model inside of passive shielding Spectrum of signals from neutrino detector The first attempt to detect antineutrino from WWR-M reactor and very preliminary results ± without AS (active shielding) 4 MC calculations of expected signals from positrons and neutrons detector Manufacturing of (Pb+CHB) shielding positrons AS neutrons without coincidence with AS with coincidence with AS detector AS Cosmic background problem. Correlated events (prompt, delayed) 20 s-1/103=2 10 -2 s-1 102 s-1/104=10 -2 s-1 prompt starts stops The first attempt to detect antineutrino from WWR-M reactor and very preliminary results 60 tons (Pb+CHB) shielding is ready the distance from the detector to the center of reactor core 5. 3 m the mechanism of movement of the detector inside passive shielding prompt with AS 103 delayed the distance from the detector to the center of reactor core 6. 6 m 102 104 delayed signal prompt signal time of arrival of the second impulse delayed with AS 102 time window 10 s 100 s But expected neutrino count ~2 10 -3 s-1 Spectrum and dependence of events in time (delayed after prompt) for all spectrum neutrons muons Preliminary results of the test measurements Project of neutrino laboratory at SM-3 reactor Separate measurements 2 -nd section R=5, 55 м 1+2 section R=5, 3 м 1+2 section R=6, 6 м Reactor ON I, c-1 (10 -3) 5, 29± 0, 265 6, 20± 0, 183 6, 83± 0, 337 6, 69± 0, 386 5, 49± 0, 349 Reactor OFF I, c-1 (10 -3) 4, 25± 0, 0665 4, 45± 0, 155 4, 57± 0, 256 5, 68± 0, 337 4, 60± 0, 266 Δ, c-1 (10 -3) on-off 1, 04± 0, 273 1, 75± 0, 240 2, 26± 0, 423 1, 01± 0, 512 0, 89± 0, 439 Δ/OFF 0, 245 0, 393 0, 495 0, 178 0, 193 Averaged results 2 s muons 1+2 секция R=5, 3 м 1+2 секция R=6, 6 м 30 s neutrons Reactor ON I, c-1 (10 -3) 6, 43 ± 0, 199 6, 09± 0, 26 Reactor OFF I, c-1 (10 -3) 4, 48± 0, 132 5, 07± 0, 21 Δ, c-1 (10 -3) on-off 1, 95± 0, 239 1, 02± 0, 334 Δ/OFF 0, 435± 0, 0548 0, 201± 0, 0664 distance dependence Expected number of antineutrino events at R=5. 3 м Expected number of antineutrino events at R=6. 6 м 2. 5 10 -3 с-1 1. 61 10 -3 с-1 The new crane is bought. There is an installation process. Concreting of floors is prepared.