CERN-WA-095()
CHORUS: A New Search for $\nu_\mu-\nu_\tau$ Oscillations
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- Proposed: Dec 15, 1990,
- Approved: Sep 18, 1991,
- Started: May 5, 1994,
- Completed: Nov 10, 1997
CHORUS Collaboration
The setup consists of a target region, an aircore magnet, a high-precision calorimeter, and a muon spectrometer. Nuclear emulsion stacks form the 800-kg mass of the fiducial target volume. Decays of short-lived particles, such as the tau, are visualized with high efficiency. Tracks are located in the emulsion with high-precision scintillating fiber trackers, and readout with optoelectronic image intensifiers coupled to CCD cameras, thus permitting computer-assisted scanning. The hexagonal aircore magnet provides the measurement of the charge-sign of low energy hadrons and muons. The high precision calorimeter, which is based on spaghetti technology, tags the tau- decay by its transverse momentum imbalance. The spectrometer identifies muons and measures their momentum and charge.
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