[Show abstract][Hide abstract] ABSTRACT: Up to several 10s of TeV, Imaging Air Cherenkov Telescopes (IACTs) have proven to be
the instruments of choice for GeV/TeV gamma-ray astronomy due to their good reconstrucion
quality and gamma-hadron separation power. However, sensitive observations at and above
100 TeV require very large effective areas (10 km 2 and more), which the current and planned
telescopes do not achieve.
The alternative to IACTs are shower front sampling arrays (non-imaging technique or
timing-arrays) with a large area and a wide field of view. Such experiments provide good core
position, energy and angular resolution, but only poor gamma-hadron separation. Combining
both experimental approaches, using the strengths of both techniques, could optimize the
sensitivity to the highest energies.
The TAIGA project plans to combine the non-imaging HiSCORE  array with small
( 10m 2 ) imaging telescopes. This paper covers simulation results of this hybrid approach.
Full-text · Article · Aug 2015 · Journal of Physics Conference Series
[Show abstract][Hide abstract] ABSTRACT: TAIGA stands for " Tunka Advanced Instrument for cosmic ray physics and Gamma Astronomy " and is a project to build a complex, hybrid detector system for ground-based gamma-ray astronomy from a few TeV to several PeV, and for cosmic ray studies from 100 TeV to 1 EeV. TAIGA will search for " PeVatrons " (ultra-high energy gamma-ray sources) and measure the composition and spectrum of cosmic rays in the knee region (100 TeV – 10 PeV) with good energy resolution and high statistics. TAIGA will include Tunka-HiSCORE (an array of wide-angle air Cherenkov stations), an array of Imaging Atmospheric Cherenkov Telescopes, an array of particle detectors, both on the surface and underground, and the TUNKA-133 air Cherenkov array.
Full-text · Article · Aug 2015 · Journal of Physics Conference Series
[Show abstract][Hide abstract] ABSTRACT: The gamma-ray energy regime beyond 10 TeV is crucial for the search for the most energetic Galactic accelerators. The energy spectra of most known gamma-ray emitters only reach up to few 10s of TeV, with 80 TeV from the Crab Nebula being the highest energy so far observed significantly. Uncovering their spectral shape up to few 100 TeV could answer the question whether some of these objects are cosmic ray pevatrons, i.e. Galactic PeV accelerators. Sensitive observations in this energy range and beyond require very large effective detector areas of several 10s to 100 square-km. While imaging air Cherenkov telescopes have proven to be the
instruments of choice in the GeV to TeV energy range, very large area telescope arrays are limited by the number of required readout channels per square-km. Alternatively, the shower front sampling technique allows to instrument large effective areas and also naturally provides large viewing angles of the instrument. Solely measuring the shower front light density and timing (hence timing-arrays), the primary particle properties are reconstructed on the basis of the measured lateral density function and the shower front arrival times. This presentation gives an overview of the technique, its goals, and future perspective.
Full-text · Article · Aug 2015 · Journal of Physics Conference Series
[Show abstract][Hide abstract] ABSTRACT: The NUCLEON satellite experiment is designed to investigate directly, above the atmosphere, the energy spectra of cosmic-ray nuclei and the chemical composition from 100 GeV to 1000 TeV as well as the cosmic-ray electron spectrum from 20 GeV to 3 TeV. NUCLEON is planned to be launched in 2014. This mission is aimed at clarifying the essential details of cosmic-ray origin in this energy interval: number and types of sources, identification of actual nearby sources, and the investigation of the mechanisms responsible for the knee. Specific features of the NUCLEON instrument are relatively small thickness and small weight. A special method of energy determination by the silicon tracker was developed for this case. In this paper we describe a design of the instrument and the results of accelerator beam tests in terms of charge and energy resolution. The overall evidences of the capability of the apparatus to achieve the declared aims are also presented.
No preview · Article · Oct 2014 · Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment
[Show abstract][Hide abstract] ABSTRACT: TAIGA stands for ``Tunka Advanced Instrument for cosmic ray physics and Gamma Astronomy'' and is a project to built a complex, hybrid detector system for ground-based gamma-ray astronomy from a few TeV to several PeV, and for cosmic ray studies from 100 TeV to 1 EeV. TAIGA will search for ``PeVatrons'' (ultra-high energy gamma-ray sources) and measure the composition and spectrum of cosmic rays in the knee region (100 TeV–10 PeV) with good energy resolution and high statistics. TAIGA will include Tunka-HiSCORE — an array of wide-angle air Cherenkov stations, an array of Imaging Atmospheric Cherenkov Telescopes, an array of particle detectors, both on the surface and underground and the TUNKA-133 air Cherenkov array.
Full-text · Article · Sep 2014 · Journal of Instrumentation
[Show abstract][Hide abstract] ABSTRACT: The TUS space experiment is aimed to study energy spectrum, composition, and angular distribution of the Ultra-High Energy Cosmic Ray (UHECR) at E ∼ 1020 eV. The TUS mission is planned for operation at the end of 2012 at the dedicated “Mikhail Lomonosov” satellite. The TUS detector will measure the fluorescence and Cherenkov light radiated by EAS of the UHECR using the optical system—Fresnel mirror-concentrator of 7 modules of ∼2 m2 area in total. Production of the flight model of the optical system is in progress. Status of the Fresnel mirror production, the method, and results of their optical parameters measurement are presented.
No preview · Article · Jan 2013 · Physics of Particles and Nuclei Letters
[Show abstract][Hide abstract] ABSTRACT: Measurement of the in-medium modifications of the Δ resonance, signatures of the excitation of nuclear collective states and the first experimental evidence for a thermal emission of photons have been obtained from the analysis of new π±4He data at Tπ = 106 MeV at PAINUC experiment.
[Show abstract][Hide abstract] ABSTRACT: A semi-empirical model is presented for the excitation of collective nuclear resonances induced by pions on nuclei in the
D \Delta(1232) energy region. The physical features of the collective states have been extracted according to the model by fitting
data from a collection of resonant p \pi -nucleus elastic scattering cross-sections. The contributions to the total binding energy and to the width of a collective
state per each additional nucleon involved in the resonance have been extracted. The interaction between the collective resonances
and the surrounding nuclear medium is discussed.
Full-text · Article · May 2011 · European Physical Journal A
[Show abstract][Hide abstract] ABSTRACT: The TUS space experiment is aimed to study energy spectrum, composition and angular distribution of the Ultra High Energy Cosmic Ray (UHECR) at E ∼ 1020 eV. The TUS mission is planned for operation at the end of 2011 at the dedicated "Mikhail Lomonosov" satellite. The TUS detector will measure the fluorescence and Cherenkov light radiated by EAS of the UHECR using the optical system - Fresnel mirror-concentrator of 7 modules of ∼2 m 2 area in total. A production of the flight model of the photo receiver is in progress. Status of the photo receiver production and tests are presented.
[Show abstract][Hide abstract] ABSTRACT: Results from testing the sample of the setup for the NUCLEON experiment aimed at studying the energy spectra and the charge
composition of cosmic rays in the energy range of 1012–1015 eV are presented. The sample has been made approach the actual
setup to the maximum degree. Charged particle beams with energies of 200–350 GeV have been used for testing. The problem of
selecting high-energy events and the accuracy of energy measurements using the method being developed are discussed. This
method is based on measuring the spatial flux density of secondary particles that are produced in the first act of inelastic
nuclear interaction inside the target of the setup and pass through a thin converter layer in which the electromagnetic component
is multiplied. The event selection efficiency is shown to be rather high. The precision in determining the energy (90–80%)
using this method is in good agreement with simulation results (∼100-80%). The results of the study fully comply with the
requirements of the NUCLEON experiment.
No preview · Article · Jan 2010 · Instruments and Experimental Techniques
[Show abstract][Hide abstract] ABSTRACT: The TUS space experiment has been proposed to address some of the most important astrophysical and particle physics problems. It is aimed to study the energy spectrum, composition and angular distribution of Ultra High Energy Cosmic Rays (UHECR) at E≈1020eV in the region of the GZK cutoff. The TUS mission is now planned for operation at the Small Space Apparatus (SSA) as an additional payload of the Foton-4 Russian-ESA satellite. The TUS optical system is an important part of the detector which will measure the fluorescence light radiated by EAS of the UHECR. It consists of a 7-segment Fresnel mirror-concentrator of 2 sq. m. The photo receiver at the mirror focal surface comprises 256 PMT pixels. In this paper the TUS optical system is described. Production of its technological prototype is in progress.
No preview · Article · Dec 2009 · Nuclear Physics B - Proceedings Supplements
[Show abstract][Hide abstract] ABSTRACT: The aim of the NUCLEON experiment is a measurement of cosmic rays flux and composition with high statistics in the near of "knee" region ( the energy spectrum 1011-5 ×1014 eV and charge range up to Z∼30) of the long duration orbit space flight. The design and production of the technological trigger modules are performed including front-end and digital electronics of the data acquisition system. The trigger module prototypes were successfully tested at the CERN SPS accelerator pion beam in 2008. The flight trigger module production is in progress. The trigger system conception, the results of beam tests are presented.
[Show abstract][Hide abstract] ABSTRACT: The NUCLEON experiment is being prepared for cosmic ray research at energy range 1012- 1015 eV. A new method has recently been proposed for measuring the spectra of primary CR particles by recording the spatial density of secondary charged particles produced by interactions of primary particles inside the setup. The photons are converted into charged electronpositron pairs by a tungsten converter. This method can be used to construct lightweight spectrometers of large geometrical factor for satellite experiments. The functional protoype of experimental device was tested by charge particles beams on SPS accelerator (CERN). The test results have demonstrated the feasibility of performing an orbital experiment with the proposed equipment.
[Show abstract][Hide abstract] ABSTRACT: interactions at have been studied by means of a self-shunted streamer chamber filled with helium at atmospheric pressure. This technique allowed reconstruction of the complete kinematics of the nuclear events under analysis, since tracks of slow p, α, tritium and 3He are readily measurable. The study revealed that the 4He nucleus behaves as a Planck radiator, emitting a Planck-like spectrum of high energy γs, when hit by a π beam of . A resonant behaviour in the π−n invariant mass spectrum has been observed, with and in the neutron knockout reaction: we consider this to be the first experimental evidence for the existence of the Δ−. The observed mass shift and width narrowing are compatible with the activation of an isobaric collective resonance in the 4He nucleus. The collaboration has also observed a resonant behaviour in the π−pp invariant mass spectrum in the pp double-charge-exchange reaction, on nuclear photoemulsion, compatible with the activation of the JP=0−d′ dibaryonic resonance with a strong p–p final state interaction. A new direct measured upper limit for the νμ mass has been derived by measuring a complete decay π–μ–e event recorded at the CERN PS179 experiment (Ne scattering): at a 90% confidence level, .
Full-text · Article · Jul 2008 · Progress in Particle and Nuclear Physics
[Show abstract][Hide abstract] ABSTRACT: The TUS (Tracking Ultra-violet Set up) space fluorescence detector has to be launched in 2010 as a separated platform in Foton (Bion) mission prepared by the Samara enterprise. This detector was designed for another satellite and the updated variant of the TUS detector for a new platform is presented. The data on UV glow of the atmosphere obtained in operation of one pixel of the TUS detector on board the Moscow State University “Universitetsky-Tatiana” satellite was taken into account in design of the updated TUS detector. The data on UV transient flashes registered in “Universitetsky-Tatiana” mission are of special interest. Electronics of the TUS detector able to select and register different types of UV events in the atmosphere is presented.
No preview · Article · Jan 2008 · Advances in Space Research
[Show abstract][Hide abstract] ABSTRACT: π-4He interactions at 106MeV, with two secondary charged particles in the final state, have been studied using a self-shunted
streamer chamber in a 0.65T magnetic field and equipped with two CCD videocameras for obtaining digitized stereo-images of
nuclear events occurring within the fiducial volume of the streamer chamber. Branching ratios for the various interaction
channels are deduced. Evidence is presented for a reaction channel involving a γ produced in the final state, as well as for
the first observation of direct Δ- -resonance production. Cross-section distributions for the elastic and quasi-elastic interaction channels are also reported.
Full-text · Article · Dec 2007 · European Physical Journal A
[Show abstract][Hide abstract] ABSTRACT: Most of the Ultra High Energy Cosmic Ray (UHECR) experiments and projects (HiRes, AUGER, TA, EUSO, TUS, etc.) use air fluorescence to detect and measure extensive air showers (EAS). The precise knowledge of the Fluorescence Light Yield (FLY) is of paramount importance for the reconstruction of UHECR. The MACFLY—Measurement of Air Cherenkov and Fluorescence Light Yield—experiment has been designed to perform such FLY measurements. In this paper we will present the results of FLY in the 290–440 nm wavelength range for dry air and pure nitrogen, both excited by electrons with energy of 1.5 MeV, 20 GeV and 50 GeV. The experiment uses a 90Sr radioactive source for low energy measurement and a CERN SPS e− beam for high energy. We find that the FLY is proportional to the deposited energy (Ed) in the gas and we show that the air fluorescence properties remain constant independently of the electron energy. At the reference point: atmospheric dry air at 1013 hPa and 23 °C, the ratio FLY/Ed = 17.6 photon/MeV with a systematic error of 13.2%.
No preview · Article · Jun 2007 · Astroparticle Physics
[Show abstract][Hide abstract] ABSTRACT: For most of the Ultra High Energy Cosmic Ray (UHECR) experiments and projects (HiRes, AUGER, TA, JEM-EUSO, TUS,...), the detection technique of Extensive Air Showers (EAS) is based, at least, on the measurement of the air fluorescence induced signal. The knowledge of the Fluorescence Light Yield (FLY) is of paramount importance for the UHECR energy reconstruction. The MACFLY experiment was designed to perform such FLY measurements. In this paper we will present the results of dry air FLY induced by 50 GeV electromagnetic showers as a function of shower age and as a function of the pressure. The experiment was performed at CERN using an SPS electron test beam line. It is shown that the FLY is proportional to deposited energy in air (E_d) and that the ratio FLY/E_d and its pressure dependence remain constant independently of shower age and more generally independently of the excitation source used (single electron track or air shower).
[Show abstract][Hide abstract] ABSTRACT: The TUS project (EECR study from space by observation of the atmosphere fluorescence) came to the construction stage. The UV sensor of the TUS detector is operating on board the “Universitetsky-Tatiana” satellite. Results of UV measurements are presented.