Nuclear emulsion techniques in the CHORUS experiment

by Takayuki Kawamura (CERN-EP)

Monday 18 Feb 2002, 16:30 → 17:30 Europe/Zurich

500/1-001 - Main Auditorium (CERN)

Nuclear emulsion has the best spatial resolution among visual detectors. In recent years, nuclear emulsion is used as a high resolution tracking device combined with electronic detectors in accelerator experiments. It is emphasised that drastic improvements in the fully automatic emulsion scanning microscopes enable us to analyse a large amount of events. The CERN WA95/CHORUS experiment was originally designed to search for n _m -> n _t oscillation in the CERN Wide Band Neutrino Beam. The apparatus is an emulsion-based hybrid setup, consisting of a nuclear emulsion target followed by electronic detectors. Using nuclear emulsion as an active target, the production of a t lepton can be recognised by detecting its short decay path. This method is used to search for neutrino oscillation. Since the lifetime of charmed particles is similar to that of the t lepton, the experiment is also suitable to study charm physics. For the second run of the experiment, three layers of emulsion tracker system were installed in addition to the original hadronic spectrometer to perform high resolution momentum measurements. This is another application of the emulsion technique in the CHORUS experiment. In this talk, the role of nuclear emulsion in the CHORUS experiment, the emulsion target and the emulsion tracker, and recent results on neutrino oscillation and charm physics are presented.

Organiser(s): Ariane Frey / EP Division

Note: Tea & coffee will be served at 16.00 hrs.