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The preliminary design of the new space gamma-ray telescope GAMMA-400 for the energy range 100 MeV -3 TeV is presented. The angular resolution of the instrument, 1-2° at E γ ~100 MeV and ~0.01º at E γ > 100 GeV, its energy resolution ~1% at E γ > 100 GeV, and the proton rejection factor ~10 6 are optimized to address a broad range of science topics, such as search for signatures of dark matter, studies of Galactic and extragalactic gamma-ray sources, Galactic and extragalactic diffuse emission, gamma-ray bursts, as well as high-precision measurements of spectra of cosmic-ray electrons, positrons, and nuclei.

Pb interactions are presented as a function of the collision centrality and compared with those obtained from p-Pb collisions. Strangeness enhancement is observed which increases with centrality and with the strangeness content of the hyperon.

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The Yb, ties structural peculiarities and the influence of additional doping of PbW04 crystals with Nb, Bi, and Mg ions have been investigated. It is shown that even a small amount of specific impurileads to an important redistribution of the structural point defects, the radiating centres, and their properties in the crystals. The data have been used for further optimization of PbW04 scintillator development for electromagnetic calorimeter (ECAL) of compact muon solenoid (CMS) at CERN. ') B.P. 110,