A5020616261- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Solar and Space Plasma Dynamics
- Neutrino Physics Research
- Radio Astronomy Observations and Technology
- Particle Detector Development and Performance
- Gamma-ray bursts and supernovae
- High-Energy Particle Collisions Research
- Radiation Therapy and Dosimetry
- Ionosphere and magnetosphere dynamics
- Radiation Detection and Scintillator Technologies
- Quantum Chromodynamics and Particle Interactions
- Pulsars and Gravitational Waves Research
- Particle Accelerators and Free-Electron Lasers
- Geophysics and Gravity Measurements
- Solar Radiation and Photovoltaics
- Rheumatoid Arthritis Research and Therapies
- Muon and positron interactions and applications
- NF-κB Signaling Pathways
- Nuclear Physics and Applications
- Astrophysical Phenomena and Observations
- Superconducting Materials and Applications
- Systemic Lupus Erythematosus Research
- Radioactivity and Radon Measurements
Institute of High Energy Physics
2012-2023
Chinese Academy of Sciences
2011-2023
Hangzhou Hospital of Traditional Chinese Medicine
2023
Nanjing University
2023
Wuhan University
2022-2023
Hirosaki University
2006
Yokohama National University
1991-2006
Hebei Normal University
2006
Saitama University
2006
Shonan Institute of Technology
1991-1996
We report on the highest energy photons from Crab Nebula observed by Tibet air shower array with underground water-Cherenkov-type muon detector array. Based criterion of a number measured in an shower, we successfully suppress 99.92% cosmic-ray background events energies E>100 TeV. As result, 24 photonlike TeV against 5.5 events, which corresponds to 5.6σ statistical significance. This is first detection astrophysical source.
The intensity of Galactic cosmic rays is nearly isotropic because the influence magnetic fields in Milky Way. Here, we present two-dimensional high-precision anisotropy measurement for energies from a few to several hundred teraelectronvolts (TeV), using large data sample Tibet Air Shower Arrays. Besides revealing finer details known anisotropies, new component ray sidereal time uncovered around Cygnus region direction. For cosmic-ray up TeV, all components anisotropies fade away, showing...
The measurement of cosmic ray energy spectra, in particular for individual species, is an essential approach finding their origin. Locating the "knees" spectra important part and has yet to be achieved. Here we report a mixed Hydrogen Helium spectrum using combination ARGO-YBJ experiment prototype Cherenkov telescope LHAASO experiment. A knee feature at 640+/-87 TeV, with clear steepening spectrum, observed. This gives fundamental inputs galactic acceleration models.
The events recorded by ARGO-YBJ in more than five years of data collection have been analyzed to determine the diffuse gamma-ray emission Galactic plane at longitudes 25° < l 100° and latitudes . energy range covered this analysis, from ∼350 GeV ∼2 TeV, allows connection region explored Fermi with multi-TeV measurements carried out Milagro. Our analysis has focused on two selected regions plane, i.e., 40° 65° 85° (the Cygnus region), where Milagro observed an excess respect predictions...
The ARGO-YBJ detector is an extensive air shower array that has been used to monitor the northern $\gamma$-ray sky at energies above 0.3 TeV from 2007 November 2013 January. In this paper, we present results of a survey in declination band $-10^{\circ}$ $70^{\circ}$, using data recorded over past five years. With integrated sensitivity ranging 0.24 $\sim$1 Crab units depending on declination, six sources have detected with statistical significance greater than 5 standard deviations. Several...
Measuring the anisotropy of arrival direction distribution cosmic rays provides important information on propagation mechanisms and identification their sources. In fact, flux is thought to be dependent only due presence nearby ray sources or particular magnetic-field structures. Recently, observation unexpected excesses at TeV energy down an angular scale as narrow $\ensuremath{\sim}10\ifmmode^\circ\else\textdegree\fi{}$ raised possibility that problem origin Galactic may addressed by...
Abstract We report on the analysis of 10–1000 TeV large-scale sidereal anisotropy Galactic cosmic rays (GCRs) with data collected by Tibet Air Shower Array from 1995 October to 2010 February. In this analysis, we improve energy estimate and extend decl. range down −30°. find that maps above 100 are distinct at a multi-TeV band. The so-called tail-in loss-cone features identified low energies get less significant, new component appears ∼100 TeV. spatial distribution GCR intensity an excess...
This paper reports on the measurement of large-scale anisotropy in distribution cosmic-ray arrival directions using data collected by air shower detector ARGO-YBJ from 2008 January to 2009 December, during minimum solar activity between cycles 23 and 24. In this period, more than 2 × 1011 showers were recorded with energies ∼1 30 TeV. The observed two-dimensional cosmic rays is characterized two wide regions excess deficit, respectively, both relative intensity ∼10−3 respect a uniform flux,...
ARGO-YBJ is an air shower detector array with a fully covered layer of resistive plate chambers. It operated high duty cycle and large field view. continuously monitors the northern sky at energies above 0.3 TeV. In this paper, we report long-term monitoring Mrk 421 over period from 2007 November to 2010 February. This source was observed by satellite-borne experiments Rossi X-ray Timing Explorer Swift in band. especially active first half 2008. Many flares are both γ-ray bands...
As one of the brightest active blazars in both X-ray and very high energy $\gamma$-ray bands, Mrk 501 is useful for physics associated with jets from AGNs. The ARGO-YBJ experiment monitoring it $\gamma$-rays above 0.3 TeV since November 2007. Starting October 2011 largest flare 2005 observed, which lasts to about April 2012. In this paper, a detailed analysis reported. During flaring episodes 17 22, 2011, an excess event rate over 6 $\sigma$ detected by direction 501, corresponding increase...
view Abstract Citations (85) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Cosmic-Ray Energy Spectrum between 10 14.5 and 16.3 eV Covering the ``Knee'' Region Amenomori, M. ; Cao, Z. Dai, B. Ding, L. K. Feng, Y. X. Hibino, Hotta, N. Huang, Q. Huo, A. Jia, H. Jiang, G. Jiao, S. Kajino, F. Kasahara, Labaciren Liu, Mei, D. Meng, R. Mimaciren Mizutani, Mu, J. Nanjo, Nishizawa, Ohnishi, Ohta, I. Ouchi, T. Ren, Saito, To. Sakata, Shi, Shibata,...
The proton-air cross section in the energy range 1--100 TeV has been measured by ARGO-YBJ cosmic ray experiment. analysis is based on primary flux attenuation for different atmospheric depths (i.e. zenith angles) and exploits detector capabilities of selecting shower development stage means hit multiplicity, density lateral profile measurements at ground. effects fluctuations, contribution heavier primaries uncertainties hadronic interaction models, have taken into account. results used to...
The Tibet-III air shower array, consisting of 533 scintillation detectors, has been operating successfully at Yangbajing in Tibet, China since 1999. Using the data set collected by this array from 1999 November through 2005 November, we obtained energy spectrum γ-rays Crab Nebula, expressed a power law as (dJ/dE) = (2.09 ± 0.32) × 10−12(E/3 TeV)−2.96±0.14 cm−2 s−1 TeV−1 range 1.7–40 TeV. This result is consistent with other independent γ-ray observations imaging Cherenkov telescopes. In...
The ARGO-YBJ experiment detects extensive air showers in a wide energy range by means of full-coverage detector which is stable data taking its full configuration since November 2007 at the YBJ International Cosmic Ray Observatory (4300 m a.s.l., Tibet, People's Republic China). In this paper measurement light-component spectrum primary cosmic rays region $(5\textdiv{}200)\text{ }\text{ }\mathrm{TeV}$ reported. method exploited to analyze experimental based on Bayesian procedure. measured...
We report on a clear solar-cycle variation of the Sun's shadow in 10 TeV cosmic-ray flux observed by Tibet air shower array during full solar cycle from 1996 to 2009. In order clarify physical implications variation, we develop numerical simulations shadow, using potential field source surface model and current sheet (CSSS) for coronal magnetic field. find that intensity deficit simulated is very sensitive structure, better reproduced CSSS model. This first successful attempt evaluate models flux.
The ARGO-YBJ air shower detector monitored the Crab Nebula gamma ray emission from 2007 November to 2013 February. integrated signal, consisting of $\sim$3.3 $\times$ 10$^5$ events,reached statistical significance 21.1 standard deviations. obtained energy spectrum in range 0.3-20 TeV can be described by a power law function dN/dE = I$_0$ (E / 2 TeV)$^{-\alpha}$, with flux normalization (5.2 $\pm$ 0.2) 10$^{-12}$ photons cm$^{-2}$ s$^{-1}$ TeV$^{-1}$ and $\alpha$ 2.63 0.05, corresponding an...
Several strong TeV γ-ray flares were detected from Mrk 421 in the years 2000 and 2001 by Tibet III air shower array at a level of statistical significance 5.1 σ. was unprecedentedly active X-ray energies during this period, positive correlation found between change all-sky monitor Rossi X-Ray Timing Explorer flux flux. When power-law energy spectrum for γ-rays source is assumed, spectral index calculated to be -3.24 ± 0.69 most phase 2001. The observed consistent with those obtained via...
In 2008, the blazar Markarian 421 entered a very active phase and was one of brightest sources in sky at TeV energies, showing frequent flaring episodes. Using data ARGO-YBJ, full coverage air shower detector located Yangbajing (4300 m a.s.l., Tibet), we monitored source gamma-ray energies E>0.3 during whole year. The observed flux variable, with strongest flares March June, correlation X-ray enhanced activity. While specific episodes could be several times larger than Crab Nebula one,...
Abstract This paper reports on the observation of sidereal large-scale anisotropy cosmic rays using data collected by ARGO-YBJ experiment over 5 years (2008–2012). analysis extends previous work limited to period from 2008 January 2009 December, near minimum solar activity between cycles 23 and 24. With new sample, cycle 24 maximum is investigated. A method used improve energy reconstruction, allowing us cover a much wider range, 4 520 TeV. Below 100 TeV, dominated two wide regions,...
We report on the extensive multi-wavelength observations of blazar Markarian 421 (Mrk 421) covering radio to gamma-rays, during 4.5 year period ARGO-YBJ and Fermi common operation time, from August 2008 February 2013. In particular, thanks data, whole energy range 100 MeV 10 TeV is covered without any gap. observation period, Mrk showed both low high activity states at all wavebands. The correlations among flux variations in different wavebands were analyzed. Seven large flares, including...