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LAPP has participated to three neutrino experiments:

• BUGEY experiment :
  Search of oscillation - at the nuclear plant of Bugey, near Lyon.
  
  Mean neutrinos energy: 4.0 MeV
  Mean neutrinos flux: 10.000 billions per second and per cm², at 15 meters.
  Searched signal: decrease of the number of interactions with respect to expected.
  Detection principle: Interaction of anti-neutrinos with protons
  (liquid scintillator + Helium proportional counters)
  and detection of the positron and the neutron coming out.
  
  

  CHOOZ experiment :

  Search for oscillation - at the nuclear plant of Chooz, in Ardennes.
  

  Mean neutrinos energy: 4.0 MeV

  Mean neutrinos flux: 5 billions per second and per cm² at 1 km.

  Searched signal: decrease of the number of interactions with respect to the number expected.

  Detection principle: Interaction of anti-neutrinos with protons

  (liquid scintillator + gadolinium)

  and detection of the positron and neutron coming out.
  
  

  NOMAD experiment :

  Search for oscillation - at CERN, with a beam of neutrinos .
  

  Mean neutrinos energy: 27 GeV

  Mean neutrinos flux: 1 million per second and per cm² at 1 km.

  Searched signal: in a beam of .

  Detection principle: Kinematics reconstruction

  The TRD: The LAPP has been involved in the construction of the TRD, one of the detectors

  of NOMAD. This detector allows to recognize electrons with a great efficiency and

  to well distinguish them from the other particles like pions, between 0.5 GeV and 50 GeV.
  
  

  Some pictures of the TRD

  Radiator of the TRD

  Construction at LAPP

  Straws tubes (proportional counters)

  Protection skins are placed at CERN

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Last update: 26/06/1999 : http://wwwlapp.in2p3.fr/neutrinos/anlapp.html

Didier Verkindt