Krasnoyarsk underground neutrino laboratory

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					  Krasnoyarsk
  underground
    neutrino
   laboratory

    V.P. Martemiyanov
for NEUTRINO GROUP of
    Kurchatov Institute
 Location of Krasnoyarsk neutrino
            laboratory

     n
              Organization: RRC “Kurchatov Institute”
              Location: Krasnoyarsk region, Zheleznogorsk
              E-mail: vpmar@dnuc.polyn.kiae.su




Krasnoyarsk city is placed on the Yenisei river
in vicinity of ancient mountains Sayani
practically at the center of Russia
            ZHELEZNOGORSK town
 Zheleznogorsk is situated at a distance of about 70 km from
Krasnoyarsk on the bank оf Yenisei river. Town is disposed in vicinity
of the Siberian taiga, which has а lot of birds and animals. There is а
beautiful large lake in the center of the town. Picturesque hills
surround the town center. А musicale theatre, hotel, rest home,
restaurants, а lot of shops are in Zheleznogorsk.
 The weather is comfortable, the quantity of sunny days is the same
as in Sochi. Winter is cold but not so much compared with Moscow,
air is dry. The summer and autumn are warmer and sunnier than in
Moscow.
 Every day one can take the flight from Moscow to Krasnoyarsk. Big
comfortable airplane airbus IL86 in 4.5 hours will put you from
Moscow to Krasnoyarsk with good service of KrasAir Company. А
special minivan during 2 hours will carry you from Krasnoyarsk
airport Yemelianovo directly to the center of Zheleznogorsk.
                 Laboratory
Krasnoyarsk neutrino laboratory was build on the МСС
underground territory (MINING & CHEMICAL COMBINE) 53,
Lenin Str., Zheleznogorsk, Krasnoyarsk region, Russia, 660972

At present the underground laboratory
consist of two experimental halls on the
20 and 35 m distances from reactor core.

The laboratory and the reactor both are
placed inside the rock (2700 kg/m3) and
the passive shielding from cosmic muons
corresponds to 600 m.w.е. The muon flux
is suppressed by factor of 1000. The
period “Reactor-ON“ is equal to
approximately 50 days, and therefore one
can measure the background each two
months, but not through 1-1.5 year as
usual on power atomic station.
Personnel: 10-12 specialists from RRC KI
(mission position) Scientific users from
St.-Petersburg Nuclear Physics Institute
        Underground view




       The underground street




   The electro
train station in
       the rock
Status of neutrino experiments at
           Krasnoyarsk
"DEUTERON"
Weak constants for charged and neutral
currents Neutrino oscillations into the
sterile state
Status: Finished 2001

NESSI-2
Search for neutrino magnetic moment
Status: In progress

Kr2Det
Search for neutrino oscillations (Ue3) by
two-detectors method
Status: R&D

The specific conditions at
Krasnoyarsk:
•The underground location,
•The antineutrino spectrum is almost pure
235U (difference < 1%),

•Reactor stops each 50 days and therefore
one can measure the background.
            Deuteron

(NC) ne + d  p + n + ne’   En > 2.23 MeV
(CC) ne + d  n + n + e+    En > 4.03 MeV
(CC) ne + p  n + e+        En > 1.80 MeV




CCs  = (3.270.30)10-44 cm2/fission235U
      d
NCs = (1.120.07)10-44 cm2/fission235U
   d
CCs = (6.390.19)10-44 cm2/fission235U
   p
NESSI, detector scheme
         ne + e  e’ + ne’
           Plastic scintiilator shielding




    Cu
                                            Pb




                     Si(Li)


                   HPGe


                                             Cd
                        Cu

                           N2
          NESSI
     detector’s photo



                            Si detector
                            matrix of one
                            layer during the
                            detector
                            construction

 Si(Li) – multidetector, full mass is 80 kg
 604 Si moduls and 1 - Ge (HiPu)
 Threshold: 50-100 keV




NESSI detector -
     outer view
              Background evolution


                                   Background in Ge detector
                                   without Cu shielding
                                                Background in Ge detector
                                                with Cu shielding
N/(kg day)




                                                  Background after the Cu
                     Moscow-Heidelberg            shielding cleaning
                     experiment at Gran Sasso



                                                          Weak neutrino-electron
                 m   =10-10   mB                          scattering effect in NESSI
                                                          at Krasnoyarsk



                                    E, keV      m =510-11 mB



             Background now is 32000/day,
             In Gran Sasso experiment – 1600/day
     Some remarks about the realization Kr2Det
                   experiment.

-Reactor operation is free for collaboration
-Reactor off (7-9 days) in every 50 days (16%)
-There is next underground infrastructure:
            two lab. hall on the distances 110 m and ~1000 m from reactor
(far hall may be on rent condition-)
            A line of electricity, air ventilation system, fair safety system
            railways to both halls
-MCC (mining&chemical combine) may carry out construction
of the detector vessel, passive shield and other engineering jobs
within 3-4 years.
-Kr2Det experiment is supported by local MCC authorities, RRC
“Kurchatov Institute”. It is discussing the participation JINR (Dubna),
PNPhI (St-Petersburg).
-Special AGREEMENT between Ministry of Atomic Energy and foreign
scientific centers should be conclude.

     ZHELEZNOGOSK CONDITIONS FOR LIVING
-One can live in guesthouse, at a hotel, on a flat.
-No problems with phones, bank accounts, food, rent car.
-High level personal safety (closed city)
-MCC is ready to give a office room in city with tel. and internet
connection.
-minivan to Krasnoyarsk airport (2 hours), plane to Moscow (4,5 hours).
-the weather is comfortable, air is dry, many of sunny days.

Kurchatov Institute and MCC may try to organize collaboration
meeting in Zheleznogorsk on August or later this year.
View of the National
 park - Krasnoyarsk
    rock pillars
 Who can guess what is
the place on the picture?

				
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posted:6/7/2012
language:English
pages:14