PNPI Group Leader:    A.V.Khanzadeev

A wide range of fundamental physical phenomena is typical for the study of the properties of nuclear matter at baryon densities several times higher than the nuclear density and relatively low temperatures up to 10 - 100 MeV. In this region, a mixed state of quark and baryonic matter can arise, a phase transition with restoration of chirality and a transition to the phase of quark matter can occur, spatially inhomogeneous phases of the “crystal” type can exist. The entire spectrum of these states is characteristic of the physics of the inner layers and crust of neutron stars.
      The formation of a state of nuclear matter with a high baryon density in the laboratory is possible using collisions of heavy ion beams with energies in the range (2 – 10) GeV/nucleon. The MPD experiment at the NICA collider under construction (JINR, Dubna) and the CBM experiment on ion beams of the future FAIR accelerator complex (GSI, Germany) are aimed at research in this area.
      The FAIR Antiproton and Ion Research Center is a unique research center under construction in Darmstadt, Germany. The complex will consist of a linear accelerator, an operating accelerator of the SIS18 project, storage rings and an accelerator SIS100, which will be upgraded later (project SIS300). The beam will be led out to various experimental halls to carry out relevant experiments. FAIR is an evolution of the existing GSI Helmholtz Center for Heavy Ion Research and will significantly expand its capabilities...
      Simultaneously, since 2003, PNPI has been participating in the development and creation of the MuCh muon spectrometer and the RICH ring Cherenkov detector for the CBM experiment. To implement the physical program of the СВМ experiment, the registration and identification of leptons in the region of small transverse momenta is critical. Therefore, stringent requirements are imposed on the RICH and MuCh detectors, and their design and manufacture is a complex task that requires the involvement of qualified specialists and specialized production facilities...
      More information about CBM research can be found in the "CBM_v1.pdf" file.
(For more information about the participation of PNPI in the CBM experiment, see the article in the collection "HEPD in 2013-2018" - pages 362-369).

PNPI Group Leader:    Yu.G. Riabov

The PHENIX experiment at BNL (USA) is designed to study a broad variety of signals from the nuclear-nuclear collisions at the energies of 100 GeV/nucleon. The most important contribution of PNPI to this experiment was design and construction of a special Drift Chamber which serves as the main tracking system in PHENIX. The PNPI group participates in running the PHENIX experiment and in the data analysis.
       (For more detail review see article "Study of light vector mesons at RHIC by PHENIX" in PNPI HEPD Report " Main scientific activities of High Energy Physics Division in 2002-2006" - page 91)
and article "EXPERIMENT PHENIX AT RHIC" in report "Main scientific activities of High Energy Physics Division in 2007-2012" - pages 84-91).
Publications see here.

HERMES project

PNPI Group Leader:    S.L. Belostotski

The HERMES experiment at DESY (Germany) is aimed to investigate the spin structure of the proton and neutron using polarized electron/positron beam of the HERA accelerator with the energy of 27.5 GeV and the polarized/unpolarized gaseous Hydrogen target. The PNPI group took part in this experiment from the very beginning. The PNPI created the proportional chambers for the magnetic spectrometer of the HERMES detector. The data analysis of the PNPI group was mainly devoted to the study of the strange particle production in ep hard scattering.
       (For more detail review see article "HERMES experiment at DESY") and article "SELECTED PHYSICS RESULTS FROM THE HERMES EXPERIMENT" in report "Main scientific activities of High Energy Physics Division in 2007-2012" - pages 114-119).
Publications see here.

SELEX: E781 project

PNPI Group Leader:    G.D. Alkhazov

The E781 experiment at FNAL (USA) is a fixed target experiment aimed at the charm barion production in the 600 GeV hyperon beam. PNPI has made significant contribution to the apparatus of this experiment providing transition radiation detectors for particle identification, proportional chambers for the tracking system, read out electronics for proportional chambers and for the Si vertex detector, a fast trigger system, and some other equipment. Also, the PNPI group took an active part in data processing and data analysis.
       (For more detail review see article "New results from SELEX" in PNPI HEPD Report " Main scientific activities of High Energy Physics Division in 2002-2006" - page 76).
Publications see here.

L3 project

PNPI Group Leader:    V.A. Schegelsky

The L3 experiment is one of the four collider experiments at the e⁺e^-  -collider LEP (CERN). PNPI has made important contributions to design and construction of the L3 detector. In particular, the End Cap trackers (FTC) were designed and constructed at PNPI. Also, the PNPI group participated in construction of the Muon System and the Electromagnetic Calorimeter, provided the water cooling racks for all L3 electronics and some other equipment. The PNPI group played an active role in running the experiment and in the data analysis.
       (For more detail review see article "Results of electroweak interaction from LEP-II experiment at CERN" in PNPI HEPD Report " Main scientific activities of High Energy Physics Division in 2002-2006" - page 107).
Publications see here.

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