A5053078618- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Radio Astronomy Observations and Technology
- Particle Detector Development and Performance
- Gamma-ray bursts and supernovae
- Particle physics theoretical and experimental studies
- Radiation Detection and Scintillator Technologies
- Cosmology and Gravitation Theories
- Particle Accelerators and Free-Electron Lasers
- Galaxies: Formation, Evolution, Phenomena
- Solar and Space Plasma Dynamics
- Computational Physics and Python Applications
- Radio Wave Propagation Studies
- Noncommutative and Quantum Gravity Theories
- Lightning and Electromagnetic Phenomena
- Pulsars and Gravitational Waves Research
- Ionosphere and magnetosphere dynamics
- Spectroscopy and Quantum Chemical Studies
- Atmospheric Ozone and Climate
- Scientific Research and Discoveries
- Astronomical Observations and Instrumentation
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Radiation Therapy and Dosimetry
Institute for Nuclear Research
2016-2025
Lomonosov Moscow State University
2004-2025
Moscow State University
2025
Development Agency of Serbia
2024
University of Buenos Aires
2021-2023
Consejo Nacional de Investigaciones Científicas y Técnicas
2021-2023
Instituto de Tecnologías en Detección y Astropartículas
2021-2023
National Technological University
2023
Institut de Recherche sur les Lois Fondamentales de l'Univers
2023
Université Paris Cité
2023
The Telescope Array (TA) experiment, located in the western desert of Utah,USA, is designed for observation extensive air showers from extremely high energy cosmic rays. experiment has a surface detector array surrounded by three fluorescence detectors to enable simultaneous detection shower particles at ground level and photons along track. TA started full hybrid March, 2008. In this article we describe design technical features detector.
We have searched for intermediate-scale anisotropy in the arrival directions of ultrahigh-energy cosmic rays with energies above 57~EeV northern sky using data collected over a 5 year period by surface detector Telescope Array experiment. report on cluster events that we call hotspot, found oversampling 20$^\circ$-radius circles. The hotspot has Li-Ma statistical significance 5.1$\sigma$, and is centered at R.A.=146.7$^{\circ}$, Dec.=43.2$^{\circ}$. position about 19$^{\circ}$ off...
The Telescope Array (TA) collaboration has measured the energy spectrum of ultra-high cosmic rays with primary energies above 1.6 x 10^(18) eV. This measurement is based upon four years observation by surface detector component TA. shows a dip at an 4.6 eV and steepening 5.4 10^(19) which consistent expectation from GZK cutoff. We present results technique, new to analysis ray data, that involves generating complete simulation striking TA detector. procedure starts shower simulations using...
The Telescope Array observatory utilizes fluorescence detectors and surface to observe air showers produced by ultra high energy cosmic rays in the Earth's atmosphere. Cosmic ray events observed this way are termed hybrid data. depth of shower maximum is related mass primary particle that generates shower. This paper reports on maxima data collected over 8.5 years using Black Rock Mesa Long Ridge conjunction with array detectors. We compare means standard deviations $X_{\mathrm{max}}$...
We revisit cosmic microwave background (CMB) constraints on the abundance of millicharged particles based Planck data. The stringent limit Omega_{mcp}h^2 < 0.001 (95% CL) may be set using CMB data alone if participate in acoustic oscillations baryon-photon plasma at recombination epoch. latter condition is valid for a wide region charges and masses particles. Adding component to LCDM shifts prefered scalar spectral index primordial perturbations somewhat larger values as compared minimal...
We report on a measurement of the cosmic ray energy spectrum by Telescope Array Low-Energy Extension (TALE) air fluorescence detector. The TALE detector is also sensitive to Cherenkov light produced shower particles. Low rays, in PeV range, are detectable as "Cherenkov Events". Using these events, we measure from low $\sim 2$ an greater than 100 PeV. Above can detect rays using fluorescence. This allows for extension energies few EeV. In this paper, will describe detector, explain technique,...
Cosmic rays are energetic charged particles from extraterrestrial sources, with the highest-energy events thought to come extragalactic sources. Their arrival is infrequent, so detection requires instruments large collecting areas. In this work, we report of an extremely particle recorded by surface detector array Telescope Array experiment. We calculate particle's energy as [Formula: see text] (~40 joules). Its direction points back a void in large-scale structure Universe. Possible...
We reconstructed the energy and position of shower maximum air showers with energies $E \gtrsim 100 $PeV applying a method using radio measurements performed Tunka-Rex. An event-to-event comparison to air-Cherenkov same Tunka-133 photomultiplier array confirms that reconstruction works reliably. The Tunka-Rex methods absolute scales have been tuned on CoREAS simulations yield $X_{\mathrm{max}}$ values consistent measurements. results two independent measurement seasons agree within...
Abstract Bursts of gamma ray showers have been observed in coincidence with downward propagating negative leaders lightning flashes by the Telescope Array Surface Detector (TASD). The TASD is a 700‐km 2 cosmic observatory located southwestern Utah, USA. In data collected between 2014 and 2016, correlated observations showing structure temporal development three shower‐producing were obtained 3‐D mapping array, electric field change measurements for an additional seven flashes, both cases...
One of the uncertainties in interpretation ultrahigh energy cosmic ray data comes from hadronic interaction models used for air shower Monte Carlo (MC) simulations. The number muons observed at ground ray--induced showers is expected to depend upon model. may therefore test by comparing measured with MC prediction. In this paper, we present results studies muon densities extensive obtained analyzing signal surface detector stations which should have high purity. purity a station will on both...
In this paper we report the first close, high-resolution observations of downward-directed terrestrial gamma-ray flashes (TGFs) detected by large-area Telescope Array cosmic ray observatory, obtained in conjunction with broadband VHF interferometer and fast electric field change measurements parent discharge. The results show that TGFs occur during strong initial breakdown pulses (IBPs) few milliseconds negative cloud-to-ground low-altitude intracloud flashes, IBPs are produced a...
We study the anisotropy of Ultra-High Energy Cosmic Ray (UHECR) events collected by Telescope Array (TA) detector in first 40 months operation. Following earlier studies, we examine event sets with energy thresholds 10 EeV, and 57 EeV. find that distributions right ascension declination are compatible an isotropic distribution all three sets. then compare previously reported clustering UHECR at small angular scales. No significant is found TA data. check E>57 EeV for correlations nearby...
The results on ultrahigh-energy cosmic rays (UHECR) mass composition obtained with the Telescope Array surface detector are presented. analysis employs Boosted Decision tree (BDT) multivariate built upon 14 observables related to both properties of shower front and lateral distribution function. classifier is trained Monte-Carlo sets events induced by primary protons iron. An average atomic UHECR presented for energies $1{0}^{18.0}--1{0}^{20.0}\text{ }\text{ }\mathrm{eV}$. particles shows no...
We report on a measurement of the cosmic ray composition by Telescope Array Low-Energy Extension (TALE) air fluorescence detector (FD). By making use Cherenkov light signal in addition to from (CR) induced extensive showers, TALE FD can measure properties rays with energies as low $\sim 2$ PeV and exceeding 1 EeV. In this paper, we present results $X_{\rm max}$ distributions showers observed over energy range. Data collected period 4$ years was analyzed for study. The resulting are compared...
We constrain several models of the early Universe that predict a statistical anisotropy cosmic microwave background (CMB) sky. make use WMAP9 maps deconvolved with beam asymmetries. As compared to previous releases WMAP data, they do not exhibit anomalously large quadrupole anisotropy. This allows us strengthen limits on parameters established earlier in literature. In particular, amplitude special is constrained as $|{g}_{*}|<0.072$ at 95% C.L. ($\ensuremath{-}0.046<{g}_{*}<0.048$ 68% C.L.)...
We search for correlations between positions of extragalactic objects and arrival directions Ultra-High Energy Cosmic Rays (UHECRs) with primary energy $E \ge 40$ EeV as observed by the surface detector array Telescope Array (TA) experiment during first 40 months operation. examined several public astronomical object catalogs, including Veron-Cetty Veron catalog active galactic nuclei. counted number TA events correlated in each a function three parameters: maximum angular separation event...
In this work we are reporting on the measurement of proton-air inelastic cross section $\sigma^{\rm inel}_{\rm p-air}$ using Telescope Array (TA) detector. Based proton-proton $\sigma_{\rm p-p}$ value is also determined at $\sqrt{s} = 95_{-8}^{+5}$ TeV. Detecting cosmic ray events ultra high energies with enables us to study fundamental parameter that otherwise unable access particle accelerators. The data used in report hybrid observed by Middle Drum fluorescence detector together surface...