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- E-mail: kulikovsky@inbox.ru A CNGS project aims to prove existence of µ oscillations in pure muon neutrino beam from SPS accelerator (CERN). Neutrinos from this beam are detected in Gran Sasso underground laboratory (Italy) located 732km from source. One of the main detector for this purpose is OPERA. It designed from Emulsion Cloud Chamber to detect tau neutrinos with very low background. Whole project began its first working cycle in 20th June.

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m 2 = 2.5 в 10 -3 eV

2

sin 2 2 = 1 .

. (), 732 (). CNGS (CERN Neutrino to Gran Sasso). µ . . OPERA[2] .

. 1. CNGS.

CGNS SPS (). 400. 10.5 2.4 в 1013 (. .1). 4.5 в 1019 . , , . , :
K + µ + +
+
0

µ

K + + + µ + + µ

, . . 730. .

OPERA (Emulsion Cloud Chamber - ECC). ECC , , (. .2). , . DONUT, . 1300 .

. 2. .

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. , , .

. 3. OPERA.

( OPERA ~10 ), 200 , 50 , . 0.2 , 30 /100 . Fuji, . . . : · µ + N µ - + X · + N + X · e + N e - + X · µ + N µ - + X c µ + N µ - + X c c ( ) · + N - + X . ( ): · - e - + e + + X (17.8%) · - µ - + µ + + X (17.7%) · - h - + + (n 0 ) (49.5%)

. 4. () OPERA.

: . , . , . 4 OPERA SuperKamiokande. (.. . 5.), 5 .

. 5. .

( . 5.), 20 500 . . , . : · (77.1%), · (19.3%), · (3.6%). . , , (~6% ). . ~16 106 . OPERA 20 [3].

123 SPS 2.28 в 1019 , OPERA. , .
1. SNO Collaboration Independent Measurement of the Total Active 8B Solar Neutrino Flux Using an Array of 3He Proportional Counters at the Sudbury Neutrino Observatory Phys. Rev. Lett. volume 101, 111301 (2008) 2. OPERA Collaboration An appearance experiment to search for µ oscillations in the CNGS beam, CERN/SPSC 2000028, SPSC/P318, LNGS P25/2000, July 10, 2000. 3. OPERA Collaboration The OPERA long baseline neutrino experiment: status and first results, ICHEP2008.