INR RAS - international collaborations

Neutrino astrophysics, cosmic rays physics

Russia-USA Gallium-Germanium Experiment  SAGE
(Los-Alamos National Laboratory, Universities, USA )

Deep Underwater Stationary Neutrino Telescopes on the Baikal Lake. One of the main directions of research activities is the development of methods for deep underwater elementary particles detection and construction of detectors using vast bulks of water of natural reservoirs as target and working substances. At the Baikal Neutrino Station a unique large telescope NT-200 is now being constructed for deep underwater neutrino research with an effective detection area 2-11 thousand square meters (for atmospheric muons) and controlled water bulk of about 200 thousand cubic meters. The construction of this many-purpose setup will allow one to search for new elementary particles and rare processes and fulfill a large-scale experimental research program in the field of high-energy cosmic ray physics.

Search for the neutrino fluxes and research in the Underground Laboratory Gran Sasso LVD (National Laboratory Gran Sasso, National Institute of Nuclear Physics (INFN), Italy)

The Telescope Array is a large scale experiment located in Utah, USA. It is designed for registration of cosmic rays with energies greater than 1018 eV. The experiment consists of the array of 512 surface detector covering 700 km2 and three fluorescence telescope stations on a 30 km triangle.
The low energy extension (TALE) deployed now will extend the energy region down to 3x1016 eV by adding 10 new high elevation angle telescopes and infill array of scintillator detectors. The experiment's goal is to understand an origin of the highest energy cosmic rays.
The project is an international collaboration of institutions in Japan, USA, South Korea, Russia and Belgium. Russia is represented by a group from INR RAS, including Vadim Kuzmin, one of the authors of the renown Greisen-Zatsepin-Kuzmin (GZK) cut-off.
The contribution of INR group includes the surface detector data reconstruction, the primary spectrum confirming the GZK effect, the strongest in the Northern hemisphere limit on the flux of ultrahigh energy photons, the analysis of the cosmic ray propagation and correlations of the observed arrival directions with the positions of potential sources.
(The University of Utah, The National Science Foundation, USA)

International project LHAASO (Large High Altitude Air Shower Observatory) will be the next generation ground-based gamma-ray astronomy and cosmic ray experiment. It is planned to be constructed in 5-6 years in Shangri La, Yunnan, Tibet (China) at altitude of 4320 m. There were no hadronic detectors envisaged in the original project and INR RAS proposed to add a central carpet of electron-neutron detectors (en-detectors elaborated in INR) of 100 x 100 m2 total area with a 5-m spacing (the PRISMA project). This could improve the LHAASO performances significantly. The central en-carpet could serve as a giant hadronic calorimeter of 104 m2, which could be expanded later unlimitedly. The proposal has been accepted.
The main goal of the PRISMA-LHAASO project, being a part of LHAASO, is a solution of so-called "knee problem" in cosmic ray energy spectrum in PeV region. This milestone problem of cosmic ray physics is not solved up to now due to very inconsistent experimental data and their interpretations. Implication of a new approach to this complicated problem based on a full-scale measurements of Extensive Air Shower (EAS) hadronic component over the total detector array area, as well as a novel approach to the EAS phenomenology, will help to solve the problem.

Experiment TUNKA (Republic of Buryatia)

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