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ISSN - 01689002, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1984, vol. 227, p. 467-469

The neutral detector at VEPP-2M

Golubev Vladimir B., Druzhinin Vladimir P., Ivanchenko Vladimir N., Peryshkin Alexandr N., Redko Igor Yu, Serednyakov Sergey I., Sidorov Veniamin A., Shatunov Yuri M.

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{symbol} → ηγ → 3γ 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. © 1984.