Search for Bound N̄N States Using a Precision Gamma and Charged Pion Spectrometer at Lear(PS183)
This experiment will use a magnetic spectrometer to search for monoenergetic γ and π ± transitions between bound N̄N states. The spectrometer is instrumented with drift chambers, proportional wire chambers, and scintillation counters. Gamma-rays produced in a 20 cm long LH2 target are materialized by a 5% converter located in the magnetic field with a geometrical acceptance (ΔΩ/4π) of ~ 2–6×10-3 (100–400 MeV) and 6×10-3 (>400 MeV). Trajectories of bent electron-positron pairs and π ± , as well as the remaining associated charged annihilation products, are measured in the various chambers. The resultant gamma-ray energy resolution is expected to be better than 1.5% FWHM over the full range of energies studied. To illustrate the sensitivity of this experiment, a y line at 300 MeV produced at the level Rγ = Γγ/ΓA = 10-4 will appear as a six standard deviation effect after an exposure of 5×1011 p̄’s.
KeywordsScintillation Counter Drift Chamber Anode Wire Proportional Chamber Geometrical Acceptance
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