A TPC for the T2K ND280 Experiment - Marie Di Marco - Geneve

jeudi 10 mai 2007, 16:30 → 18:00 Europe/Paris

Bernard Grossetete (LPNHE)

Didier Lacour (LPNHE)

In the recent years, the so-called 3 neutrino Standard Model has become a new paradigm in particle and astroparticle physics. Experiments aiming at the measurement of neutrino oscillations parameters are consistent at a very high level, withthe simplest extension of the electroweak model to accomodate non-zero neutrino mass and mixing. T2K is a long baseline neutrino oscillation experiment aiming at the discovery of the nu_mu --> nu_e appearance with a factor 20 of improvement in sensitivity over past experiments. A high intensity proton beam from the JPARC 50 GeV synchrotron produces a pion decay neutrino beam aimed with a 2.5 degree off-axis angle to the Super-Kamiokande detector. Theflux, spectrum and cross sections of the neutrinos (~750 MeV/c) have to be measured before they have a chance to oscillate. This is achieved by the near detector, located 280m away from the source. ND280 uses the UA1 magnet operated with a magneticfield of 0.2T, in which sits a tracker composed of 3 projection chambers (TPC's), readout by 72 MicroMegas (micropattern gasdetectors). This talk will first give an overview of the status of solar and accelerator neutrino physics, then present the T2K experiment, and finally the ND280 detector.