Dresden 2000 – scientific programme
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T: Teilchenphysik
T 106: Neutrinos 1
T 106.6: Talk
Monday, March 20, 2000, 15:30–15:45, H\,403
OPERA - A European/Japanese Initiative for a Long-Baseline Neutrino Oscillation Experiment — •N. Bruski1,2, P. Boschan1, N. D’Ambrosio1, D. Frekers1, T. Kellmann1, D. Rondeshagen1, J. Schmand1, H.J. Wörtche1, T. Wolff1, F.W. Büßer3, A. Geiser3, K. Höpfner3, B. Koppitz3, B. Naroska3, W. Schmidt-Parzefall3, and R. van Staa3 — 1Inst. f. Kernphysik, WWU Münster, 48149 Münster — 2INFN Napoli, 80126 Napoli — 3II. Inst. f. Exp. Physik, Univ. 22761 Hamburg
The OPERA (Oscillation Project with Emulsion tRacking Apparatus) experiment is designed for the search of νµ↔ ντ oscillations in the parameter region indicated by Super-Kamiokande (SK) to explain the zenith angle dependence of the atmospheric neutrino deficit. OPERA is a long-baseline experiment to be located in the Gran Sasso Laboratory in the CERN Neutrino beam to Gran Sasso (CNGS). OPERA is a massive lead/nuclear emulsion detector. It uses the concept of the Emulsion Cloud Chamber (ECC), which is a sandwich of passive material plates interspaced with nuclear emulsion layers to allow high precision tracking and a direct observation of the τ lepton produced in ντ CC interaction. Electronic detectors locate the events in the emulsions. Iron spectrometers measure charge and momentum of muons. With the present running scheme of the proposed CNGS facility, the OPERA sensitivity reaches Δ m2 ≃ 1 · 10−3 eV2. If oscillation occurs at the preferred SK parameter values Δ m2 = 3.5 · 10−3 eV2 and sin2 2 θ = 1 , the experiment will detect several unambiguous events. The talk will describe the OPERA performance and the detection scheme using the ECC technology.