Abstract
The design and characteristics of the neutral detector based on NaI(Tl) crystals with a total weight of 2.6 t for experiments at the electron-positron storage ring VEPP-2M are described. The solid angle of the detector is 65% of 4π sr. The energy resolution for photons in the energy range 50–1000 MeV is from 20% to 10% (fwhm). For events with the detection of all final particles a further improvement of the detector resolution by means of the kinematic reconstruction method is possible. For the decay ϕ → ηγ → 3 γ an effective mass resolution of 10% is obtained for the η-meson mass. By the energy deposition in NaI(Tl) layers an electron/pion separation of 0.001 is achived at an energy of 500 MeV.
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