Author: "Ning, C. C." / Topic: 01 natural sciences - Searchworks@Jio Institute Digital Library Search Results

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1. EAS age determination from the study of the lateral distribution of charged particles near the shower axis with the ARGO-YBJ experiment

Author: YBJ Collaboration, Bartoli, B., Bernardini, P., Bi, X. J., Cao, Z., Catalanotti, S., Chen, S. Z., Chen, T. L., Cui, S. W., Dai, B. Z., D'Amone, A., Danzengluobu, De Mitri, I., Piazzoli, B. D'Ettorre, Di Girolamo, T., Di Sciascio, G., Feng, C. F., Feng, Zhaoyang, Feng, Zhenyong, Gou, Q. B., Guo, Y. Q., He, H. H., Hu, Haibing, Hu, Hongbo, Iacovacci, M., Iuppa, R., Jia, H. Y., Labaciren, Li, H. J., Liu, C., Liu, J., Liu, M. Y., Lu, H., Ma, L. L., Ma, X. H., Mancarella, G., Mari, S. M., Marsella, G., Mastroianni, S., Montini, P., Ning, C. C., Perrone, L., Pistilli, P., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, H., Wu, C. Y., Wu, H. R., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, L., Zhang, X. Y., Zhang, Y., Zhao, J., Zhaxiciren, Zhaxisangzhu, Zhou, X. X., Zhu, F. R., Zhu, Q. Q., Bartoli, B., Bernardini, P., Bi, X. J., Cao, Z., Catalanotti, S., Chen, S. Z., Chen, T. L., Cui, S. W., Dai, B. Z., D'Amone, A., Danzengluobu, Null, De Mitri, I., D'Ettorre Piazzoli, B., Di Girolamo, T., Di Sciascio, G., Feng, C. F., Feng, Zhaoyang, Feng, Zhenyong, Gou, Q. B., Guo, Y. Q., He, H. H., Hu, Haibing, Hu, Hongbo, Iacovacci, M., Iuppa, R., Jia, H. Y., Labaciren, Null, Li, H. J., Liu, C., Liu, J., Liu, M. Y., Lu, H., Ma, L. L., Ma, X. H., Mancarella, G., Mari, S. M., Marsella, G., Mastroianni, S., Montini, P., Ning, C. C., Perrone, L., Pistilli, P., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, H., Wu, C. Y., Wu, H. R., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, L., Zhang, X. Y., Zhang, Y., Zhao, J., Zhaxiciren, Null, Zhaxisangzhu, Null, Zhou, X. X., Zhu, F. R., and Zhu, Q. Q.
Subjects: Shower age, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Extensive air shower, FOS: Physical sciences, Cosmic ray, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Wide dynamic range, Extensive air showers, Instrumentation and Methods for Astrophysics (astro-ph.IM), 010303 astronomy & astrophysics, Cosmic rays, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Range (particle radiation), 010308 nuclear & particles physics, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy and Astrophysics, Charged particle, Computational physics, Distribution function, Air shower, Particle, Composition, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: The ARGO-YBJ experiment, a full coverage extensive air shower (EAS) detector located at high altitude (4300 m a.s.l.) in Tibet, China, has smoothly taken data, with very high stability, since November 2007 to the beginning of 2013. The array consisted of a carpet of about 7000 m2 Resistive Plate Chambers (RPCs) operated in streamer mode and equipped with both digital and analog readout, providing the measurement of particle densities up to few particles per cm2. The unique detector features (full coverage, readout granularity, wide dynamic range, ..) and location (very high altitude) allowed a detailed study of the lateral density profile of charged particles at ground very close to the shower axis and its description by a proper lateral distribution function (LDF). In particular, the information collected in the first 10 m from the shower axis have been shown to provide a very effective tool for the determination of the shower development stage ("age") in the energy range 50 TeV - 10 PeV. The sensitivity of the age parameter to the mass composition of primary Cosmic Rays is also discussed.
Published: 2017

2. Observation of the thunderstorm-related ground cosmic ray flux variations by ARGO-YBJ

Author: Bartoli, B., Bernardini, P., Bi, X. J., Cao, Z., Catalanotti, S., Chen, S. Z., Chen, T. L., Cui, S. W., Dai, B. Z., D'Amone, A., Danzengluobu, De Mitri, I., D'Ettorre Piazzoli, B., Di Girolamo, T., Di Sciascio, G., Feng, C. F., Feng, Zhaoyang, Feng, Zhenyong, Gao, W., Gou, Q. B., Guo, Y. Q., He, H. H., Hu, Haibing, Hu, Hongbo, Iacovacci, M., Iuppa, R., Jia, H. Y., Labaciren, Li, H. J., Liu, C., Liu, J., Liu, M. Y., Lu, H., Ma, L. L., Ma, X. H., Mancarella, G., Mari, S. M., Marsella, G., Mastroianni, S., Montini, P., Ning, C. C., Perrone, L., Pistilli, P., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Surdo, A., Tan, Y. H., VALLANIA, PIERO, VERNETTO, Silvia Teresa, Vigorito, C., Wang, H., Wu, C. Y., Wu, H. R., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, L., Zhang, X. Y., Zhang, Y., Zhao, J., Zhaxiciren, Zhaxisangzhu, Zhou, X. X., Zhu, F. R., Zhu, Q. Q., D'Alessandro, F., ARGO-YBJ Collaboration, Bartoli, B., Bernardini, P., Bi, X. J., Cao, Z., Catalanotti, S., Chen, S. Z., Chen, T. L., Cui, S. W., Dai, B. Z., D’Amone, A., Danzengluobu, Null, De Mitri, I., D’Ettorre Piazzoli, B., Di Girolamo, T., Di Sciascio, G., Feng, C. F., Feng, Zhaoyang, Feng, Zhenyong, Gao, W., Gou, Q. B., Guo, Y. Q., He, H. H., Hu, Haibing, Hu, Hongbo, Iacovacci, M., Iuppa, R., Jia, H. Y., Labaciren, Null, Li, H. J., Liu, C., Liu, J., Liu, M. Y., Lu, H., Ma, L. L., Ma, X. H., Mancarella, G., Mari, S. M., Marsella, G., Mastroianni, S., Montini, P., Ning, C. C., Perrone, L., Pistilli, P., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, H., Wu, C. Y., Wu, H. R., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, L., Zhang, X. Y., Zhang, Y., Zhao, J., Zhaxiciren, Null, Zhaxisangzhu, Null, Zhou, X. X., Zhu, F. R., Zhu, Q. Q., D’Alessandro, F., D'Amone, A., Danzengluobu, null, D'Ettorre Piazzoli, B., Labaciren, null, Zhaxiciren, null, Zhaxisangzhu, null, and D'Alessandro, F.
Subjects: Physics, Earth and Planetary Astrophysics (astro-ph.EP), High Energy Astrophysical Phenomena (astro-ph.HE), Field (physics), Physics and Astronomy (miscellaneous), Astrophysics::High Energy Astrophysical Phenomena, Flux, FOS: Physical sciences, Cosmic ray, Electron, 01 natural sciences, Computational physics, Air shower, Electric field, 0103 physical sciences, Thunderstorm, 010306 general physics, Astrophysics - High Energy Astrophysical Phenomena, 010303 astronomy & astrophysics, Event (particle physics), Astrophysics - Earth and Planetary Astrophysics
Abstract: A correlation between the secondary cosmic ray flux and the near-earth electric field intensity, measured during thunderstorms, has been found by analyzing the data of the ARGO-YBJ experiment, a full coverage air shower array located at the Yangbajing Cosmic Ray Laboratory (4300 m a. s. l., Tibet, China). The counting rates of showers with different particle multiplicities, have been found to be strongly dependent upon the intensity and polarity of the electric field measured during the course of 15 thunderstorms. In negative electric fields (i.e. accelerating negative charges downwards), the counting rates increase with increasing electric field strength. In positive fields, the rates decrease with field intensity until a certain value of the field EFmin (whose value depends on the event multiplicity), above which the rates begin increasing. By using Monte Carlo simulations, we found that this peculiar behavior can be well described by the presence of an electric field in a layer of thickness of a few hundred meters in the atmosphere above the detector, which accelerates/decelerates the secondary shower particles of opposite charge, modifying the number of particles with energy exceeding the detector threshold. These results, for the first time, give a consistent explanation for the origin of the variation of the electron/positron flux observed for decades by high altitude cosmic ray detectors during thunderstorms., Comment: 17 pages, 11 figures. The paper has been accepted by PRD
Published: 2017
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3. Knee of the cosmic hydrogen and helium spectrum below 1 PeV measured by ARGO-YBJ and a Cherenkov telescope of LHAASO

Author: Bartoli, B., Bernardini, P., Bi, X. J., Branchini, P., Budano, A., Camarri, P., Cao, Z., Cardarelli, R., Catalanotti, S., Chen, S. Z., Chen, T. L., Creti, P., Cui, S. W., Dai, B. Z., D Amone, A., Danzengluobu, Mitri, I., D Ettorre Piazzoli, B., Di Girolamo, T., Di Sciascio, G., Feng, C. F., Feng, Zhaoyang, Feng, Zhenyong, Gou, Q. B., Guo, Y. Q., He, H. H., Hu, Haibing, Hu, Hongbo, Iacovacci, M., Iuppa, R., Jia, H. Y., Labaciren, Li, H. J., Liguori, G., Liu, C., Liu, J., Liu, M. Y., Lu, H., Ma, L. L., Ma, X. H., Mancarella, G., Mari, S. M., Marsella, G., Martello, D., Mastroianni, S., Montini, P., Ning, C. C., Panareo, M., Perrone, L., Pistilli, P., Ruggieri, F., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Surdo, A., Tan, Y. H., Piero Vallania, Vernetto, S., Vigorito, C., Wang, H., Wu, C. Y., Wu, H. R., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, L., Zhang, X. Y., Zhang, Y., Zhao, J., Zhaxiciren, Zhaxisangzhu, Zhou, X. X., Zhu, F. R., Zhu, Q. Q., Zizzi, G., Bai, Y. X., Chen, M. J., Chen, Y., Feng, S. H., Gao, B., Gu, M. H., Hou, C., Li, X. X., Liu, J. L., Wang, X., Xiao, G., Zhang, B. K., Zhang, S. S., Zhou, B., Zuo, X., Bartoli, B., Bernardini, P., Bi, X. J., Cao, Z., Catalanotti, S., Chen, S. Z., Chen, T. L., Cui, S. W., Dai, B. Z., D'Amone, A., Danzengluobu, Null, De Mitri, I., D'Ettorre Piazzoli, B., Di Girolamo, T., Di Sciascio, G., Feng, C. F., Feng, Zhaoyang, Feng, Zhenyong, Guo, Q. B., Guo, Y. Q., He, H. H., Hu, Haibing, Hu, Hongbo, Iacovacci, M., Iuppa, R., Jia, H. Y., Labaciren, Null, Li, H. J., Liu, C., Liu, J., Liu, M. Y., Lu, H., Ma, L. L., Ma, X. H., Mancarella, G., Mari, S. M., Marsella, G., Mastroianni, S., Montini, P., Ning, C. C., Perrone, L., Pistilli, P., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, H., Wu, C. Y., Wu, H. R., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, L., Zhang, X. Y., Zhang, Y., Zhao, J., Zhaxiciren, Null, Zhaxisangzhu, Null, Zhou, X. X., Zhu, F. R., Zhu, Q. Q., Bai, Y. X., Chen, M. J., Feng, S. H., Gao, B., Gu, M. H., Hou, C., Liu, J. L., Wang, X., Xiao, G., Zhang, B. K., Zhang, S. S., Zhou, B., Zuo, X., ITA, Bartoli, Bruno, Bi, X. . j., Catalanotti, Sergio, Chen, S. . z., Chen, T. . l., Cui, S. . w., Dai, B. z, D’Amone, A., D'ETTORRE PIAZZOLI, Benedetto, DI GIROLAMO, Tristano, Feng, C. . f., Guo, Q. . b., Guo, Y. . q., He, H. . h., Iacovacci, Michele, Jia, H. . y., Li, H. . j., Liu, M. . y., Ma, L. . l., Ma, X. . h., Mari, S. . m., Ning, C. . c., Shen, P. . r., Sheng, X. . d., Tan, Y. . h., Wu, C. . y., Wu, H. . r., Yang, Q. . y., Yang, X. . c., Yao, Z. . g., Yuan, A. . f., Zhang, H. . m., Zhang, X. . y., Zhou, X. . x., Zhu, F. . r., Zhu, Q. . q., Bai, Y. . x., Chen, M. . j., Feng, S. . h., Gu, M. . h., Liu, J. . l., Zhang, B. . k., Zhang, S. . s., B., Bartoli, P., Bernardini, X. J., Bi, Z., Cao, S., Catalanotti, S. Z., Chen, T. L., Chen, S. W., Cui, B. Z., Dai, D, A., ’, Amone, Danzengluobu, I. De, Mitri, D, B., Ettorre, Piazzoli, T. Di, Girolamo, G. Di, Sciascio, C. F., Feng, Zhaoyang, Feng, Zhenyong, Feng, Q. B., Guo, Y. Q., Guo, H. H., He, Haibing, Hu, Hongbo, Hu, M., Iacovacci, R., Iuppa, H. Y., Jia, Labaciren, H. J., Li, C., Liu, J., Liu, M. Y., Liu, H., Lu, L. L., Ma, X. H., Ma, G., Mancarella, Mari, Stefano Maria, G., Marsella, S., Mastroianni, Montini, Paolo, C. C., Ning, L., Perrone, P., Pistilli, P., Salvini, R., Santonico, P. R., Shen, X. D., Sheng, F., Shi, A., Surdo, Y. H., Tan, P., Vallania, S., Vernetto, C., Vigorito, H., Wang, C. Y., Wu, H. R., Wu, L., Xue, Q. Y., Yang, X. C., Yang, Z. G., Yao, A. F., Yuan, M., Zha, H. M., Zhang, L., Zhang, X. Y., Zhang, Y., Zhang, J., Zhao, Zhaxiciren, Zhaxisangzhu, X. X., Zhou, F. R., Zhu, Q. Q., Zhu, Y. X., Bai, M. J., Chen, S. H., Feng, B., Gao, M. H., Gu, C., Hou, J. L., Liu, X., Wang, G., Xiao, B. K., Zhang, S. S., Zhang, B., Zhou, and Collaboratio, (LHAASO
Subjects: Nuclear and High Energy Physics, Proton, Astrophysics::High Energy Astrophysical Phenomena, Cosmic microwave background, FOS: Physical sciences, Cosmic ray, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Cosmic Ray, Helium, Spectral line, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, 010303 astronomy & astrophysics, Cherenkov radiation, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Spectral index, 010308 nuclear & particles physics, Astrophysics::Instrumentation and Methods for Astrophysics, 13. Climate action, Production (computer science), Astrophysics - High Energy Astrophysical Phenomena, Energy (signal processing), proton
Abstract: The measurement of the cosmic ray energy spectrum, in particular for individual species of nuclei, is an important tool to investigate cosmic ray production and propagation mechanisms. The determination of the ``knees'' in the spectra of different species remains one of the main challenges in cosmic ray physics. In fact, experimental results are still conflicting. In this paper we report a measurement of the mixed proton and helium energy spectrum, obtained with the combined data of the ARGO-YBJ experiment and a wide field of view Cherenkov telescope, a prototype of the future LHAASO experiment. By means of a multiparameter technique, we have selected a high-purity proton plus helium sample. The reconstructed energy resolution is found to be about 25% throughout the investigated energy range from 100 TeV to 3 PeV, with a systematic uncertainty in the absolute energy scale of 9.7%. The found energy spectrum can be fitted with a broken power-law function, with a break at the energy ${\mathrm{E}}_{k}=700\ifmmode\pm\else\textpm\fi{}230(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}70(\mathrm{sys})\text{ }\text{ }\mathrm{TeV}$, where the spectral index changes from $\ensuremath{-}2.56\ifmmode\pm\else\textpm\fi{}0.05$ to $\ensuremath{-}3.24\ifmmode\pm\else\textpm\fi{}0.36$. The statistical significance of the observed spectral break is 4.2 standard deviations.
Published: 2015

4. Search for Gamma-Ray Bursts with the ARGO-YBJ Detector in Shower Mode

Author: Bartoli, B., Bernardini, P., Bi, X. J., Cao, Z., Catalanotti, S., Chen, S. Z., Chen, T. L., Cui, S. W., Dai, B. Z., D'Amone, A., Danzengluobu, De Mitri, I., D'Ettorre Piazzoli, B., Di Girolamo, T., Di Sciascio, G., Feng, C. F., Feng, Zhaoyang, Feng, Zhenyong, Gao, W., Gou, Q. B., Guo, Y. Q., He, H. H., Hu, Haibing, Hu, Hongbo, Iacovacci, M., Iuppa, R., Jia, H. Y., Labaciren, Li, H. J., Liu, C., Liu, J., Liu, M. Y., Lu, H., Ma, L. L., Ma, X. H., Mancarella, G., Mari, S. M., Marsella, G., Mastroianni, S., Montini, P., Ning, C. C., Perrone, L., Pistilli, P., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Surdo, A., Tan, Y. H., VALLANIA, PIERO, VERNETTO, Silvia Teresa, Vigorito, C., Wang, H., Wu, C. Y., Wu, H. R., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, L., Zhang, X. Y., Zhang, Y., Zhao, J., Zhaxiciren, Zhaxisangzhu, Zhou, X. X., Zhu, F. R., Zhu, Q. Q., ARGO-YBJ Collaboration, Bartoli, B., Bernardini, P., Bi, X. J., Cao, Z., Catalanotti, S., Chen, S. Z., Chen, T. L., Cui, S. W., Dai, B. Z., D'Amone, A., Danzengluobu, Null, Mitri, I. De, Piazzoli, B. D'Ettorre, Di Girolamo, T., Sciascio, G. Di, Feng, C. F., Feng, Zhaoyang, Feng, Zhenyong, Gao, W., Gou, Q. B., Guo, Y. Q., He, H. H., Hu, Haibing, Hu, Hongbo, Iacovacci, M., Iuppa, R., Jia, H. Y., Labaciren, Null, Li, H. J., Liu, C., Liu, J., Liu, M. Y., Lu, H., Ma, L. L., Ma, X. H., Mancarella, G., Mari, S. M., Marsella, G., Mastroianni, S., Montini, P., Ning, C. C., Perrone, L., Pistilli, P., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, H., Wu, C. Y., Wu, H. R., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, L., Zhang, X. Y., Zhang, Y., Zhao, J., Zhaxiciren, Null, Zhaxisangzhu, Null, Zhou, X. X., Zhu, F. R., Zhu, Q. Q., and Girolamo, T. Di
Subjects: Astrophysics and Astronomy, gamma-ray burst: general, FOS: Physical sciences, Field of view, Cosmic ray, Astrophysics, general [gamma-ray burst], 7. Clean energy, 01 natural sciences, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, 010303 astronomy & astrophysics, Particle Physics - Phenomenology, High Energy Astrophysical Phenomena (astro-ph.HE), astro-ph.HE, Physics, 010308 nuclear & particles physics, Detector, Gamma ray, hep-ph, Astronomy and Astrophysics, Gamma-ray astronomy, Astronomy and Astrophysic, Redshift, High Energy Physics - Phenomenology, Air shower, 13. Climate action, Space and Planetary Science, Astrophysics - High Energy Astrophysical Phenomena, Gamma-ray burst
Abstract: The ARGO-YBJ detector, located at the Yangbajing Cosmic Ray Laboratory (4300 m a. s. l., Tibet, China), was a full coverage air shower array dedicated to gamma ray astronomy and cosmic ray studies. The wide field of view (~ 2 sr) and high duty cycle (> 86%), made ARGO-YBJ suitable to search for short and unexpected gamma ray emissions like gamma ray bursts (GRBs). Between 2007 November 6 and 2013 February 7, 156 satellite-triggered GRBs (24 of them with known redshift) occurred within the ARGO-YBJ field of view. A search for possible emission associated to these GRBs has been made in the two energy ranges 10-100 GeV and 10-1000 GeV. No significant excess has been found in time coincidence with the satellite detections nor in a time window of one hour after the bursts. Taking into account the EBL absorption, upper limits to the energy fluence at 99% of confidence level have been evaluated,with values ranging from ~ 10-5 erg cm-2 to ~10-1 erg cm-2., 24pages and 12 figures
Published: 2017
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5. Long-term monitoring of the TeV emission from Mrk 421 with the ARGO-YBJ experiment

Author: Collaboration, The ARGO-YBJ, Bartoli, B., Bernardini, P., Bi, X. J., Bleve, C., Bolognino, I., Branchini, P., Budano, A., Melcarne, A. K. Calabrese, Camarri, P., Cao, Z., Cappa, A., Cardarelli, R., Catalanotti, S., Cattaneo, C., Celio, P., Chen, S. Z., Chen, T. L., Chen, Y., Creti, P., Cui, S. W., Dai, B. Z., Staiti, G. D'Alí, Danzengluobu, Dattoli, M., De Mitri, I., Piazzoli, B. D'Ettorre, Di Girolamo, T., Ding, X. H., Di Sciascio, G., Feng, C. F., Feng, Zhaoyang, Feng, Zhenyong, Galeazzi, F., Galeotti, P., Giroletti, E., Gou, Q. B., Guo, Y. Q., He, H. H., Hu, Haibing, Hu, Hongbo, Huang, Q., Iacovacci, M., Iuppa, R., James, I., Jia, H. Y., Labaciren, Li, H. J., Li, J. Y., Li, X. X., Liguori, G., Liu, C., Liu, C. Q., Liu, J., Liu, M. Y., Lu, H., Ma, X. H., Mancarella, G., Mari, S. M., Marsella, G., Martello, D., Mastroianni, S., Montini, P., Ning, C. C., Pagliaro, A., Panareo, M., Panico, B., Perrone, L., Pistilli, P., Qu, X. B., Rossi, E., Ruggieri, F., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Stanescu, C., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, B., Wang, H., Wu, C. Y., Wu, H. R., Xu, B., Xue, L., Yan, Y. X., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, Jilong, Zhang, Jianli, Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhaxiciren, Zhaxisangzhu, Zhou, X. X., Zhu, F. R., Zhu, Q. Q., Zizzi, G., Bartoli, Bruno, Catalanotti, Sergio, D'ETTORRE PIAZZOLI, Benedetto, DI GIROLAMO, Tristano, Iacovacci, Michele, Bartoli, B, Bernardini, P, Bi, XJ, Bleve, C, Bolognino, I, Branchini, P, Budano, A, Calabrese Melcarne, AK, Camarri, P, Cao, Z, Cappa, A, Cardarelli, R, Catalanotti, S, Cattaneo, C, Celio, P, Chen, SZ, Chen, TL, Chen, Y, Creti, P, Cui SW, Dai, BZ, D'Alí Staiti, G, Danzengluobu, Dattoli, M, De Mitri, I, D'Ettorre Piazzoli, B, Di Girolamo, T, Ding, XH, Di Sciascio, G, Feng CF, Feng, XYa, Feng, ZYo, Galeazzi, F, Galeotti, P, Giroletti, E, Gou, QB, Guo, YQ, He, HH, Hu, HBi, Hu, HBo, Huang, Q, Iacovacci, M, Iuppa, R, James, I, Jia, HY, Labaciren, Li, HJ, Li, JY, Li, XX, Liguori, G, Liu, C, Liu, CQ, Liu, J, Liu, MY, Lu, H, Ma, XH, Mancarella, G, Mari, SM, Marsella, G, Martello, D, Mastroianni, S, Montini, P, Ning, CC, Pagliaro, A, Panareo, M, Panico, B, Perrone, L, Pistilli, P, Qu, XB, Rossi, E, Ruggieri, F, Salvini, P, Santonico, R, Shen, PR, Sheng, XD, Shi, F, Stanescu, C, Surdo, A, Tan, YH, Vallania, P, Vernetto, S, Vigorito, C, Wang, B, Wang, H, Wu, CY, Wu, HR, Xu, B, Xue, L, Yan, YX, Yang, QY, Yang, XC, Yao, ZG, Yuan, AF, Zha, M, Zhang, HM, Zhang, JLo, Zhang,JLi, Zhang,L, Zhang, P, Zhang, XY, Zhang, Y, Zhaxiciren, Zhaxisangzhu, Zhou, XX, Zhu, FR, Zhu, QQ, Zizzi, G, Bi, Xj, Melcarne, Akc, Chen, Sz, Chen, Tl, Cui, Sw, Dai, Bz, Staiti, Gd, Piazzoli, Bd, Ding, Xh, Feng, Cf, Feng, Zy, Gou, Qb, Guo, Yq, He, Hh, Hu, Hb, Jia, Hy, Li, Hj, Li, Jy, Li, Xx, Liu, Cq, Liu, My, Ma, Xh, Mari, Stefano Maria, Ning, Cc, Qu, Xb, Shen, Pr, Sheng, Xd, Tan, Yh, Wu, Cy, Wu, Hr, Yan, Yx, Yang, Qy, Yang, Xc, Yao, Zg, Yuan, Af, Zhang, Hm, Zhang, Jl, Zhang, L, Zhang, Xy, Zhaxiciren, Zhaxisangzhu, Zhou, Xx, Zhu, Fr, Zhu, Qq, and Zizzi, G.
Subjects: media_common.quotation_subject, Astrophysics::High Energy Astrophysical Phenomena, Oggetti di tipo BL Lacertae, FOS: Physical sciences, Flux, Astrophysics, 01 natural sciences, 7. Clean energy, individual (Markarian 421) [BL Lacertae objects], Spectral line, Gamma-rays, Markarian 421, BL Lacertae, Resistive Plate Chambers, law.invention, law, 0103 physical sciences, Radiative transfer, 010303 astronomy & astrophysics, media_common, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, 010308 nuclear & particles physics, Markarian 421, Settore FIS/01 - Fisica Sperimentale, Astronomy and Astrophysics, general [gamma ray], Synchrotron, 3. Good health, Air shower, 13. Climate action, Space and Planetary Science, Duty cycle, Sky, Raggi gamma, Spectral energy distribution, Astrophysics - High Energy Astrophysical Phenomena
Abstract: ARGO-YBJ is an air shower detector array with a fully covered layer of resistive plate chambers. It is operated with a high duty cycle and a large field of view. It continuously monitors the northern sky at energies above 0.3 TeV. In this paper, we report a long-term monitoring of Mrk 421 over the period from 2007 November to 2010 February. This source was observed by the satellite-borne experiments Rossi X-ray Timing Explorer and Swift in the X-ray band. Mrk 421 was especially active in the first half of 2008. Many flares are observed in both X-ray and gamma-ray bands simultaneously. The gamma-ray flux observed by ARGO-YBJ has a clear correlation with the X-ray flux. No lag between the X-ray and gamma-ray photons longer than 1 day is found. The evolution of the spectral energy distribution is investigated by measuring spectral indices at four different flux levels. Hardening of the spectra is observed in both X-ray and gamma-ray bands. The gamma-ray flux increases quadratically with the simultaneously measured X-ray flux. All these observational results strongly favor the synchrotron self-Compton process as the underlying radiative mechanism., 30 pages, 8 figures
Published: 2011

6. The cosmic ray proton plus helium energy spectrum measured by the ARGO-YBJ experiment in the energy range 3-300 TeV

Author: Argo-Ybj, The Collaboration, Bartoli, B., Bernardini, P., Bi, X. J., Cao, Z., Catalanotti, S., Chen, S. Z., Chen, T. L., Cui, S. W., Dai, B. Z., D Amone, A., Danzengluobu, Mitri, I., D Ettorre Piazzoli, B., Di Girolamo, T., Di Sciascio, G., Feng, C. F., Feng, Zhaoyang, Feng, Zhenyong, Gou, Q. B., Guo, Y. Q., He, H. H., Hu, Haibing, Hu, Hongbo, Iacovacci, M., Iuppa, R., Jia, H. Y., Labaciren, Li, H. J., Liu, C., Liu, J., Liu, M. Y., Lu, H., Ma, L. L., Ma, X. H., Mancarella, G., Mari, S. M., Marsella, G., Mastroianni, S., Montini, P., Ning, C. C., Perrone, L., Pistilli, P., Salvini, P., Santonico, R., Settanta, G., Shen, P. R., Sheng, X. D., Shi, F., Surdo, A., Tan, Y. H., Piero Vallania, Vernetto, S., Vigorito, C., Wang, H., Wu, C. Y., Wu, H. R., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, L., Zhang, X. Y., Zhang, Y., Zhao, J., Zhaxiciren, Zhaxisangzhu, Zhou, X. X., Zhu, F. R., Zhu, Q. Q., Bartoli, B., Bernardini, P., Bi, X. J., Cao, Z., Catalanotti, S., Chen, S. Z., Chen, T. L., Cui, S. W., Dai, B. Z., D'Amone, A., Danzengluobu, De Mitri, I., D'Ettorre Piazzoli, B., Di Girolamo, T., Di Sciascio, G., Feng, C. F., Feng, Z., Gou, Q. B., Guo, Y. Q., He, H. H., Hu, H., Iacovacci, M., Iuppa, R., Jia, H. Y., Labaciren, Li, H. J., Liu, C., Liu, J., Liu, M. Y., Lu, H., Ma, L. L., Ma, X. H., Mancarella, G., Mari, S. M., Marsella, G., Mastroianni, S., Montini, P., Ning, C. C., Perrone, L., Pistilli, P., Salvini, P., Santonico, R., Settanta, G., Shen, P. R., Sheng, X. D., Shi, F., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, H., Wu, C. Y., Wu, H. R., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, L., Zhang, X. Y., Zhang, Y., Zhao, J., Zhaxiciren, Zhaxisangzhu, Zhou, X. X., Zhu, F. R., Zhu, Q. Q., B., Bartoli, Bernardini, Paolo, X. . J., Bi, Z., Cao, S., Catalanotti, Chen, S. . Z., Chen, T. . L., Cui, S. . W., Dai, B. . Z., A., D’Amone, DE MITRI, Ivan, B., D’Ettorre Piazzoli, T., Di Girolamo, G., Di Sciascio, Feng, C. . F., Zhaoyang, Feng, Zhenyong, Feng, Gou, Q. . B., Guo, Y. . Q., H. . H., He, Haibing, Hu, Hongbo, Hu, M., Iacovacci, R., Iuppa, Jia, H. . Y., H. . J., Li, C., Liu, J., Liu, Liu, M. . Y., H., Lu, L. . L., Ma, X. . H., Ma, Mancarella, Giovanni, Mari, S. . M., Marsella, Giovanni, S., Mastroianni, P., Montini, Ning, C. . C., Perrone, Lorenzo, P., Pistilli, P., Salvini, R., Santonico, G., Settanta, Shen, P. . R., Sheng, X. . D., F., Shi, A., Surdo, Tan, Y. . H., P., Vallania, S., Vernetto, C., Vigorito, H., Wang, C. . Y., Wu, H. . R., Wu, L., Xue, Yang, Q. . Y., Yang, X. . C., Yao, Z. . G., Yuan, A. . F., M., Zha, Zhang, H. . M., L., Zhang, Zhang, X. . Y., Y., Zhang, J., Zhao, Zhou, X. . X., Zhu, F. . R., Zhu, Q. . Q., B. Bartoli, BERNARDINI, Paolo, X. .J. Bi, Z. Cao, S. Catalanotti, S. .Z. Chen, T. .L. Chen, S. .W. Cui, B. .Z. Dai, A. D’Amone, B. D’Ettorre Piazzoli, T. Di Girolamo, G. Di Sciascio, C. .F. Feng, Zhaoyang Feng, Zhenyong Feng, Q. .B. Gou, Y. .Q. Guo, H. .H. He, Haibing Hu, Hongbo Hu, M. Iacovacci, R. Iuppa, H. .Y. Jia, H. .J. Li, C. Liu, J. Liu, M. .Y. Liu, H. Lu, L. .L. Ma, X. .H. Ma, MANCARELLA, Giovanni, S. .M. Mari, MARSELLA, GIOVANNI, S. Mastroianni, P. Montini, C. .C. Ning, PERRONE, Lorenzo, P. Pistilli, P. Salvini, R. Santonico, G. Settanta, P. .R. Shen, X. .D. Sheng, F. Shi, A. Surdo, Y. .H. Tan, P. Vallania, S. Vernetto, C. Vigorito, H. Wang, C. .Y. Wu, H. .R. Wu, L. Xue, Q. .Y. Yang, X. .C. Yang, Z. .G. Yao, A. .F. Yuan, M. Zha, H. .M. Zhang, L. Zhang, X. .Y. Zhang, Y. Zhang, J. Zhao, X. .X. Zhou, F. .R. Zhu, Q. .Q. Zhu, Bartoli, Bruno, Bi, X. . j., Catalanotti, Sergio, Chen, S. . z., Chen, T. . l., Cui, S. . w., Dai, B. . z., D’Amone, A., Danzengluobu, Null, D'ETTORRE PIAZZOLI, Benedetto, DI GIROLAMO, Tristano, Feng, C. . f., Feng, Zhaoyang, Feng, Zhenyong, Gou, Q. . b., Guo, Y. . q., He, H. . h., Hu, Haibing, Hu, Hongbo, Iacovacci, Michele, Jia, H. . y., Labaciren, Null, Li, H. . j., Liu, M. . y., Ma, L. . l., Ma, X. . h., Mari, S. . m., Ning, C. . c., Shen, P. . r., Sheng, X. . d., Tan, Y. . h., Wu, C. . y., Wu, H. . r., Yang, Q. . y., Yang, X. . c., Yao, Z. . g., Yuan, A. . f., Zhang, H. . m., Zhang, X. . y., Zhaxiciren, Null, Zhaxisangzhu, Null, Zhou, X. . x., Zhu, F. . r., Zhu, Q. . q., Mari, Stefano Maria, The ARGO YBJ, Collaboration, and ITA
Subjects: Nuclear and High Energy Physics, PARTICLE-ACCELERATION, Physics and Astronomy (miscellaneous), Proton, Astrophysics::High Energy Astrophysical Phenomena, SHELL, FOS: Physical sciences, Cosmic ray, Astrophysics, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Observatory, 0103 physical sciences, Ultra-high-energy cosmic ray, 010306 general physics, Cosmic-ray observatory, DETECTOR, Nuclear and High Energy Physic, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), AIR-SHOWERS, Spectral index, 010308 nuclear & particles physics, Astrophysics::Instrumentation and Methods for Astrophysics, Spectral density, Air shower, 13. Climate action, SUPERNOVA REMNANT, High Energy Physics::Experiment, Astrophysics - High Energy Astrophysical Phenomena
Abstract: The ARGO-YBJ experiment is a full-coverage air shower detector located at the Yangbajing Cosmic Ray Observatory (Tibet, People's Republic of China, 4300 m a.s.l.). The high altitude, combined with the full-coverage technique, allows the detection of extensive air showers in a wide energy range and offer the possibility of measuring the cosmic ray proton plus helium spectrum down to the TeV region, where direct balloon/space-borne measurements are available. The detector has been in stable data taking in its full configuration from November 2007 to February 2013. In this paper the measurement of the cosmic ray proton plus helium energy spectrum is presented in the region 3-300 TeV by analyzing the full collected data sample. The resulting spectral index is $\gamma = -2.64 \pm 0.01$. These results demonstrate the possibility of performing an accurate measurement of the spectrum of light elements with a ground based air shower detector., Comment: 18 pages, 8 figures, preprint submitted to Phys. Rev. D

7. TeV gamma-ray survey of the Northern sky using the ARGO-YBJ detector

Author: Argo-Ybj, The Collaboration, Bartoli, B., Bernardini, P., Bi, X. J., Bolognino, I., Branchini, P., Budano, A., Calabrese Melcarne, A. K., Camarri, P., Cao, Z., Cardarelli, R., Catalanotti, S., Chen, S. Z., Chen, T. L., Chen, Y., Creti, P., Cui, S. W., Dai, B. Z., Damone, A., Danzengluobu, Mitri, I., Dettorre Piazzoli, B., Di Girolamo, T., Ding, X. H., Di Sciascio, G., Feng, C. F., Feng, Zhaoyang, Feng, Zhenyong, Gou, Q. B., Guo, Y. Q., He, H. H., Hu, Haibing, Hu, Hongbo, Huang, Q., Iacovacci, M., Iuppa, R., Jia, H. Y., Labaciren, Li, H. J., Li, J. Y., Li, X. X., Liguori, G., Liu, C., Liu, C. Q., Liu, J., Liu, M. Y., Lu, H., Ma, L. L., Ma, X. H., Mancarella, G., Mari, S. M., Marsella, G., Martello, D., Mastroianni, S., Montini, P., Ning, C. C., Panareo, M., Panico, B., Perrone, L., Pistilli, P., Ruggieri, F., Salvini, P., Santonico, R., Sbano, S. N., Shen, P. R., Sheng, X. D., Shi, F., Surdo, A., Tan, Y. H., Piero Vallania, Vernetto, S., Vigorito, C., Wang, B., Wang, H., Wu, C. Y., Wu, H. R., Xu, B., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, Jilong, Zhang, Jianli, Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhao, J., Zhaxiciren, Zhaxisangzhu, Zhou, X. X., Zhu, F. R., Zhu, Q. Q., Zizzi, G., Bartoli, Bruno, Bernardini, P., X. J., Bi, Bolognino, I., Branchini, P., Budano, A., Calabrese Melcarne, A. K., Camarri, P., Cao, Z., Cardarelli, R., Catalanotti, Sergio, Chen, S. Z., Chen, T. L., Chen, Y., Creti, P., Cui, S. W., Dai, B. Z., D'Amone, A., Danzengluobu, De Mitri, I., D'ETTORRE PIAZZOLI, Benedetto, DI GIROLAMO, Tristano, Ding, X. H., Di Sciascio, G., Feng, C. F., Zhaoyang, Feng, Zhenyong, Feng, Gou, Q. B., Guo, Y. Q., H. H., He, Haibing, Hu, Hongbo, Hu, Huang, Q., Iacovacci, Michele, Iuppa, R., Jia, H. Y., Labaciren, H. J., Li, J. Y., Li, X. X., Li, Liguori, G., Liu, C., Liu, C. Q., Liu, J., Liu, M. Y., Lu, H., L. L., Ma, X. H., Ma, Mancarella, G., Mari, S. M., Marsella, G., Martello, D., Mastroianni, S., Montini, P., Ning, C. C., Panareo, M., Panico, B., Perrone, L., Pistilli, P., Ruggieri, F., Salvini, P., Santonico, R., Sbano, S. N., Shen, P. R., Sheng, X. D., Shi, F., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, B., Wang, H., C. Y., Wu, H. R., Wu, Xu, B., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Jilong, Zhang, Jianli, Zhang, Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhao, J., Zhaxiciren, Zhaxisangzhu, Zhou, X. X., Zhu, F. R., Zhu, Q. Q., Zizzi, and G., B. Bartoli, BERNARDINI, Paolo, X. J. Bi, I. Bolognino, P. Branchini, A. Budano, A. K. Calabrese Melcarne, P. Camarri, Z. Cao, R. Cardarelli, S. Catalanotti, S. Z. Chen, T. L. Chen, Y. Chen, P. Creti, S. W. Cui, B. Z. Dai, D'AMONE, ANTONIO, DE MITRI, Ivan, B. D'Ettorre Piazzoli, T. Di Girolamo, X. H. Ding, G. Di Sciascio, C. F. Feng, Zhaoyang Feng, Zhenyong Feng, Q. B. Gou, Y. Q. Guo, H. H. He, Haibing Hu, Hongbo Hu, Q. Huang, M. Iacovacci, R. Iuppa, H. Y. Jia, H. J. Li, J. Y. Li, X. X. Li, G. Liguori, C. Liu, C. Q. Liu, J. Liu, M. Y. Liu, H. Lu, L. L. Ma, X. H. Ma, MANCARELLA, Giovanni, S. M. Mari, MARSELLA, GIOVANNI, MARTELLO, Daniele, S. Mastroianni, P. Montini, C. C. Ning, PANAREO, Marco, B. Panico, PERRONE, Lorenzo, P. Pistilli, F. Ruggieri, P. Salvini, R. Santonico, S. N. Sbano, P. R. Shen, X. D. Sheng, F. Shi, A. Surdo, Y. H. Tan, P. Vallania, S. Vernetto, C. Vigorito, B. Wang, H. Wang, C. Y. Wu, H. R. Wu, B. Xu, L. Xue, Q. Y. Yang, X. C. Yang, Z. G. Yao, A. F. Yuan, M. Zha, H. M. Zhang, Jilong Zhang, Jianli Zhang, L. Zhang, P. Zhang, X. Y. Zhang, Y. Zhang, J. Zhao, X. X. Zhou, F. R. Zhu, Q. Q. Zhu, G. Zizzi, B., Bartoli, Bernardini, Paolo, I., Bolognino, P., Branchini, A., Budano, A. K., Calabrese Melcarne, P., Camarri, Z., Cao, R., Cardarelli, S., Catalanotti, S. Z., Chen, T. L., Chen, Y., Chen, P., Creti, S. W., Cui, B. Z., Dai, D'Amone, Antonio, B., D'Ettorre Piazzoli, T., Di Girolamo, X. H., Ding, G., Di Sciascio, C. F., Feng, Q. B., Gou, Y. Q., Guo, Q., Huang, M., Iacovacci, R., Iuppa, H. Y., Jia, G., Liguori, C., Liu, C. Q., Liu, J., Liu, M. Y., Liu, H., Lu, Mancarella, Giovanni, S. M., Mari, Marsella, Giovanni, Martello, Daniele, S., Mastroianni, P., Montini, C. C., Ning, Panareo, Marco, B., Panico, Perrone, Lorenzo, P., Pistilli, F., Ruggieri, P., Salvini, R., Santonico, S. N., Sbano, P. R., Shen, X. D., Sheng, F., Shi, A., Surdo, Y. H., Tan, P., Vallania, S., Vernetto, C., Vigorito, B., Wang, H., Wang, B., Xu, L., Xue, Q. Y., Yang, X. C., Yang, Z. G., Yao, A. F., Yuan, M., Zha, H. M., Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhang, J., Zhao, X. X., Zhou, F. R., Zhu, Q. Q., Zhu, G., Zizzi, Mari, Stefano Maria, and The ARGO YBJ, Collaboration
Subjects: Astrophysics::High Energy Astrophysical Phenomena, media_common.quotation_subject, FOS: Physical sciences, Flux, Field of view, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Gamma rays: general – surveys, 01 natural sciences, Declination, 0103 physical sciences, Absorption (logic), 010303 astronomy & astrophysics, media_common, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, 010308 nuclear & particles physics, Settore FIS/01 - Fisica Sperimentale, Astrophysics::Instrumentation and Methods for Astrophysics, Gamma ray, Astronomy and Astrophysics, general – su [gamma rays], Air shower, Extragalactic background light, 13. Climate action, Space and Planetary Science, Sky, general – surveys [Gamma rays], Astrophysics - High Energy Astrophysical Phenomena
Abstract: 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 to 2013 January. In this paper, we present the results of a sky survey in the declination band from $-10^{\circ}$ to $70^{\circ}$, using data recorded over the past five years. With an integrated sensitivity ranging from 0.24 to $\sim$1 Crab units depending on the declination, six sources have been detected with a statistical significance greater than 5 standard deviations. Several excesses are also reported as potential $\gamma$-ray emitters. The features of each source are presented and discussed. Additionally, $95\%$ confidence level upper limits of the flux from the investigated sky region are shown. Specific upper limits for 663 GeV $\gamma$-ray AGNs inside the ARGO-YBJ field of view are reported. The effect of the absorption of $\gamma$-rays due to the interaction with extragalactic background light is estimated., Comment: 30 pages, 13 figures, Accepted for publication by ApJ

8. Intrinsic linearity of bakelite Resistive Plate Chambers operated in streamer mode

Author: M. Iacovacci, L. L. Ma, X. H. Ma, Hongbo Hu, X. Y. Zhang, Minghui Liu, L. Perrone, Zihuang Cao, P. Creti, Haifeng Li, R. Santonico, Yicheng Guo, J. B. Zhao, P. Salvini, A. Budano, Chang-Chun Ning, Cunfeng Feng, Zhaoyang Feng, Fudong Shi, Z. G. Yao, C. Y. Wu, B. D'Ettorre Piazzoli, H. Lu, F. R. Zhu, S. Mastroianni, Danzengluobu, G. Di Sciascio, I. De Mitri, S. M. Mari, X. C. Yang, Piero Vallania, T. L. Chen, Zhaxiciren, G. Liguori, L. Xue, Paolo Camarri, Zhenyong Feng, B. Bartoli, C. X. Liu, H. W. Wang, Zhaxisangzhu, J. K. K. Liu, H. Y. Jia, Longzhou Zhang, Q. Q. Zhu, M. Zha, X. J. Bi, M. Panareo, G. Mancarella, S. W. Cui, S. Z. Chen, T. Di Girolamo, H. R. Wu, B. Z. Dai, F. Ruggieri, P. Branchini, Q. B. Gou, A. F. Yuan, Labaciren, Q. Y. Yang, G. Zizzi, H. H. He, Y. H. Tan, A. D'Amone, X. D. Sheng, Paolo Bernardini, Paolo Montini, R. Iuppa, R. Cardarelli, G. Marsella, S. Vernetto, Pengnian Shen, S. Catalanotti, P. Pistilli, H. M. Zhang, X. X. Zhou, A. Surdo, Carlo Vigorito, Haibing Hu, Y. Zhang, D. Martello, Bartoli B., Bernardini P., Bi X. J., Branchini P., Budano A., Camarri P., Cao Z., Cardarelli R., Catalanotti S., Chen S. Z., Chen T. L., Creti P., Cui S. W., Dai B. Z., D'Amone A., Danzengluobu, De Mitri I., D'Ettorre Piazzoli B., Di Girolamo T., Di Sciascio G., Feng C. F., Feng Z., Gou Q. B., Guo Y. Q., He H. H., Hu H., Iacovacci M., Iuppa R., Jia H. Y., Labaciren, Li H. J., Liguori G., Liu C., Liu J., Liu M. Y., Lu H., Ma L. L., Ma X. H., Mancarella G., Mari S. M., Marsella G., Martello D., Mastroianni S., Montini P., Ning C. C., Panareo M., Perrone L., Pistilli P., Ruggieri F., Salvini P., Santonico R., Shen P. R., Sheng X. D., Shi F., Surdo A., Tan Y. H., Vallania P., Vernetto S., Vigorito C., Wang H., Wu C. Y., Wu H. R., Xue L., Yang Q. Y., Yang X. C., Yao Z. G., Yuan A. F., Zha M., Zhang H. M., Zhang L., Zhang X. Y., Zhang Y., Zhao J., Zhaxiciren Zhaxisangzhu, Zhou X. X., Zhu F. R., Zhu Q. Q., Zizzi G., Bartoli, B., Bernardini, P., Bi, X. J., Branchini, P., Budano, A., Camarri, P., Cao, Z., Cardarelli, R., Catalanotti, S., Chen, S. Z., Chen, T. L., Creti, P., Cui, S. W., Dai, B. Z., D'Amone, A., De Mitri, I., D'Ettorre Piazzoli, B., Di Girolamo, T., Di Sciascio, G., Feng, C. F., Feng, Z., Gou, Q. B., Guo, Y. Q., He, H. H., Hu, H., Iacovacci, M., Iuppa, R., Jia, H. Y., Li, H. J., Liguori, G., Liu, C., Liu, J., Liu, M. Y., Lu, H., Ma, L. L., Ma, X. H., Mancarella, G., Mari, S. M., Marsella, G., Martello, D., Mastroianni, S., Montini, P., Ning, C. C., Panareo, M., Perrone, L., Pistilli, P., Ruggieri, F., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, H., Wu, C. Y., Wu, H. R., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, L., Zhang, X. Y., Zhang, Y., Zhao, J., Zhaxiciren, Zhaxisangzhu, Zhou, X. X., Zhu, F. R., Zhu, Q. Q., Zizzi, G., D’Amone, A., Danzengluobu, Null, D’Ettorre Piazzoli, B., Feng, Zhaoyang, Feng, Zhenyong, Hu, Haibing, Hu, Hongbo, Labaciren, Null, Zhaxiciren, Null, and Zhaxisangzhu, Null
Subjects: Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Intrinsic linearity, Streamer mode, Cosmic ray, Calorimetry, 01 natural sciences, chemistry.chemical_compound, Optics, 0103 physical sciences, Bakelite, Particle density, 010303 astronomy & astrophysics, Instrumentation, Physics, Resistive touchscreen, 010308 nuclear & particles physics, business.industry, Detector, Settore FIS/01 - Fisica Sperimentale, Linearity, RPC detector, Streamer mode, Intrinsic linearity, Calorimetry, chemistry, Particle, Physics::Accelerator Physics, RPC detector, business, Beam (structure)
Abstract: Resistive Plate Chambers have largely been used in High Energy Physics and Cosmic Ray research. In view of using this detector for calorimetry applications it is important to know the maximum measurable particle density, or its intrinsic linearity limit, which is tightly related to the dimension of the discharge region. In this paper we report the results of measurements performed at the Beam Test Facility (INFN National Laboratory of Frascati, Italy) where the intrinsic linearity of bakelite RPCs operated in streamer mode has been tested at different impinging particle densities.
Published: 2019

9. Search for Gamma-Ray Emission from the Sun during Solar Minimum with the ARGO-YBJ Experiment

Author: C. Y. Wu, Labaciren, Q. Y. Yang, P. Montini, X. H. Ma, C. C. Ning, Haifeng Li, C. Q. Liu, Q. B. Gou, Q. Q. Zhu, L. Zhang, T. L. Chen, Danzengluobu, C. Vigorito, P. Bernardini, R. Santonico, Zhaxisangzhu, Hongbo Hu, Yicheng Guo, A. Surdo, Y. H. Tan, P. R. Shen, X. C. Yang, H. Y. Jia, H. R. Wu, S. Catalanotti, B. Z. Dai, J. Zhao, Huihai He, Zhaoyang Feng, F. R. Zhu, P. Pistilli, H. M. Zhang, H. Lu, Minghui Liu, G. Di Sciascio, X. Y. Zhang, Zihou Li, G. Mancarella, I. De Mitri, T. Di Girolamo, Zhaxiciren, Xiangdong Sheng, R. Iuppa, S. W. Cui, A. F. Yuan, S. Vernetto, S. Z. Chen, A. D'Amone, Cunfeng Feng, H. Wang, S. Mastroianni, Y. J. Zhang, Haibing Hu, B. Bartoli, X. J. Bi, L. Perrone, J. K. K. Liu, L. L. Ma, W. Gao, M. Zha, Zhenyong Feng, X. X. Zhou, P. Vallania, B. D'Ettorre Piazzoli, L. Xue, Z. G. Yao, M. Iacovacci, Zhengguo Cao, F. Shi, P. Salvini, G. Marsella, S. M. Mari, Bartoli B., Bernardini P., Bi X. J., Cao Z., Catalanotti S., Chen S. Z., Chen T. L., Cui S. W., Dai B. Z., D'Amone A., Danzengluobu, Mitri I. D., Piazzoli B. D., Girolamo T. D., Sciascio G. D., Feng C. F., Feng Z., Gao W., Gou Q. B., Guo Y. Q., He H. H., Hu H., Iacovacci M., Iuppa R., Jia H. Y., Labaciren, Li H. J., Li Z., Liu C., Liu J., Liu M. Y., Lu H., Ma L. L., Ma X. H., Mancarella G., Mari S. M., Marsella G., Mastroianni S., Montini P., Ning C. C., Perrone L., Pistilli P., Salvini P., Santonico R., Shen P. R., Sheng X. D., Shi F., Surdo A., Tan Y. H., Vallania P., Vernetto S., Vigorito C., Wang H., Wu C. Y., Wu H. R., Xue L., Yang Q. Y., Yang X. C., Yao Z. G., Yuan A. F., Zha M., Zhang H. M., Zhang L., Zhang X. Y., Zhang Y., Zhao J., Zhaxiciren Zhaxisangzhu, Zhou X. X., Zhu F. R., Zhu Q. Q., Bartoli, B., Bernardini, P., Bi, X. J., Cao, Z., Catalanotti, S., Chen, S. Z., Chen, T. L., Cui, S. W., Dai, B. Z., D'Amone, A., Mitri, I. D., Piazzoli, B. D., Girolamo, T. D., Sciascio, G. D., Feng, C. F., Feng, Z., Gao, W., Gou, Q. B., Guo, Y. Q., He, H. H., Hu, H., Iacovacci, M., Iuppa, R., Jia, H. Y., Li, H. J., Li, Z., Liu, C., Liu, J., Liu, M. Y., Lu, H., Ma, L. L., Ma, X. H., Mancarella, G., Mari, S. M., Marsella, G., Mastroianni, S., Montini, P., Ning, C. C., Perrone, L., Pistilli, P., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, H., Wu, C. Y., Wu, H. R., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, L., Zhang, X. Y., Zhang, Y., Zhao, J., Zhaxiciren, Zhaxisangzhu, Zhou, X. X., Zhu, F. R., Zhu, Q. Q., D’Amone, A., Danzengluobu, Null, Mitri, I. De, Piazzoli, B. D’Ettorre, Di Girolamo, T., Sciascio, G. Di, Feng, Zhaoyang, Feng, Zhenyong, Hu, Haibing, Hu, Hongbo, Labaciren, Null, Zhaxiciren, Null, and Zhaxisangzhu, Null
Subjects: Solar minimum, Sun: general, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Cosmic ray, astroparticle physics, cosmic rays, gamma rays: general, 7. Clean energy, 01 natural sciences, Atmosphere, 0103 physical sciences, general [Sun], 010303 astronomy & astrophysics, Argo, cosmic ray, High Energy Astrophysical Phenomena (astro-ph.HE), Astroparticle physics, Physics, 010308 nuclear & particles physics, Settore FIS/01 - Fisica Sperimentale, Gamma ray, Astronomy, astroparticle physic, Astronomy and Astrophysics, 13. Climate action, Space and Planetary Science, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, general [gamma rays]
Abstract: The hadronic interaction of cosmic rays with solar atmosphere can produce high energy gamma-rays. The gamma-ray luminosity is correlated both with the flux of primary cosmic rays and the intensity of the solar magnetic field. The gamma-rays below 200 GeV have been observed by Fermi without any evident energy cutoff. The bright gamma-ray flux above 100 GeV has been detected only during solar minimum. The only available data in the TeV range come from the HAWC observations, however, outside the solar minimum. The ARGO-YBJ data set has been used to search for sub-TeV/TeV gamma-rays from the Sun during the solar minimum from 2008 to 2010, the same time period covered by the Fermi data. A suitable model containing the Sun shadow, solar disk emission, and inverse-Compton emission has been developed, and the chi-square minimization method was used to quantitatively estimate the disk gamma-ray signal. The result shows that no significant gamma-ray signal is detected and upper limits to the gamma-ray flux at 0.3-7 TeV are set at the 95% confidence level. In the low energy range these limits are consistent with the extrapolation of the Fermi-LAT measurements taken during solar minimum and are compatible with a softening of the gamma-ray spectrum below 1 TeV. They also provide an experimental upper bound to any solar disk emission at TeV energies. Models of dark matter annihilation via long-lived mediators predicting gamma-ray fluxes >10-7 GeV cm-2 s-1 below 1 TeV are ruled out by the ARGO-YBJ limits.
Published: 2019

10. Absolute-energy-scale calibration of ARGO-YBJ for light primaries in multi-TeV region with the Moon shadow observation

Author: X. C. Yang, H. H. He, T. Di Girolamo, Zhenyong Feng, H. Y. Jia, B. D'Ettorre Piazzoli, L. Xue, Hong-peng Lu, P. Pistilli, H. M. Zhang, X. X. Zhou, M. Iacovacci, M. Zha, Labaciren, X. D. Sheng, S. M. Mari, J. K. K. Liu, A. Surdo, Paolo Bernardini, L. L. Ma, Haibing Hu, Longzhou Zhang, H. W. Wang, J. B. Zhao, P. Salvini, Chang-Chun Ning, C. X. Liu, H. J. Li, H. R. Wu, Zhaoyang Feng, G. Marsella, X. J. Bi, Y. Zhang, Z. G. Yao, G. Mancarella, Zhaxisangzhu, C. Y. Wu, B. Bartoli, S. Z. Chen, L. Perrone, R. Santonico, G. Di Sciascio, Y. H. Tan, Fudong Shi, B. Z. Dai, S. Mastroianni, Carlo Vigorito, Zhaxiciren, F. R. Zhu, Danzengluobu, Y. Q. Guo, Q. Q. Zhu, I. De Mitri, Q. B. Gou, Zihuang Cao, Piero Vallania, T. L. Chen, A. F. Yuan, Pengnian Shen, S. Catalanotti, S. W. Cui, Hongbo Hu, C. F. Feng, P. Montini, X. H. Ma, X. Y. Zhang, Minghui Liu, R. Iuppa, S. Vernetto, A. D'Amone, Q. Y. Yang, Bartoli, B., Bernardini, P., Bi, X. J., Cao, Z., Catalanotti, S., Chen, S. Z., Chen, T. L., Cui, S. W., Dai, B. Z., D'Amone, A., Danzengluobu, Null, De Mitri, I., D'Ettorre Piazzoli, B., Di Girolamo, T., Di Sciascio, G., Feng, C. F., Feng, Zhaoyang, Feng, Zhenyong, Gou, Q. B., Guo, Y. Q., He, H. H., Hu, Haibing, Hu, Hongbo, Iacovacci, M., Iuppa, R., Jia, H. Y., Labaciren, Null, Li, H. J., Liu, C., Liu, J., Liu, M. Y., Lu, H., Ma, L. L., Ma, X. H., Mancarella, G., Mari, Stefano Maria, Marsella, G., Mastroianni, S., Montini, Paolo, Ning, C. C., Perrone, L., Pistilli, Pio, Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, H., Wu, C. Y., Wu, H. R., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M, Zhang, H. M., Zhang, L., Zhang, X. Y., Zhang, Y., Zhao, J., Zhaxiciren, Null, Zhaxisangzhu, Null, Zhou, X. X., Zhu, F. R., Zhu, Q. Q., Bernardini, Paolo, D'Amone, Antonio, DE MITRI, Ivan, D’Ettorre Piazzoli, B., Mancarella, Giovanni, Mari, S. M., Marsella, Giovanni, Montini, P., Perrone, Lorenzo, Pistilli, P., Zha, M., and collaboration), (The ARGO YBJ
Subjects: Cosmic ray, Energy calibration, Energy spectrum, Moon shadow, Physics, Large Hadron Collider, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Moon shadow, Astronomy, Astronomy and Astrophysics, Cosmic ray, Interaction model, Astrophysics, 01 natural sciences, Scale error, Energy calibration, Energy spectrum, Rigidity (electromagnetism), 0103 physical sciences, Ultra-high-energy cosmic ray, 010303 astronomy & astrophysics, Argo
Abstract: In 2011 ARGO-YBJ experiment has reported a work to study the absolute rigidity scale of the primary cosmic ray particles based on the Moon's shadow observation. Given the progress in high energy hadronic interaction models with LHC data, in cosmic ray chemical composition measurement and in experimental data accumulation, more updates can be researched. This paper aims to further disentangle the composition dependence in absolute-energy-scale calibration by using specific moon-shadow data which mainly is comprised of light component cosmic rays. Results show that, 17% energy scale error is estimated from 3 TeV to 50 TeV. To validate the performance of this technique, the light component cosmic ray spectrum in the same energy region is shown. (C) 2017 Elsevier B.V. All rights reserved.
Published: 2017
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11. Galactic Cosmic-Ray Anisotropy in the Northern hemisphere from the ARGO-YBJ Experiment during 2008-2012

Author: J. Zhao, Hongbo Hu, P. R. Shen, X. C. Yang, A. Surdo, Yicheng Guo, Y. H. Tan, Zhaoyang Feng, F. R. Zhu, X. J. Bi, T. Di Girolamo, J. K. K. Liu, S. Vernetto, Zhaxisangzhu, Zhengguo Cao, S. Z. Chen, Q. Q. Zhu, L. Zhang, T. L. Chen, R. Santonico, S. Mastroianni, C. Vigorito, C. Y. Wu, S. W. Cui, C. Q. Liu, Q. B. Gou, C. C. Ning, P. Vallania, F. Shi, S. M. Mari, B. D'Ettorre Piazzoli, A. D'Amone, H. J. Li, H. R. Wu, Zhaxiciren, R. Iuppa, L. Xue, P. Salvini, G. Marsella, W. Gao, P. Bernardini, H. Wang, H. Lu, Danzengluobu, S. Catalanotti, David Ruffolo, A. F. Yuan, B. Z. Dai, Y. J. Zhang, Huihai He, M. Zha, G. Di Sciascio, X. Y. Zhang, Labaciren, Xiangdong Sheng, P. Pistilli, H. M. Zhang, Minghui Liu, I. De Mitri, Q. Y. Yang, P. Montini, X. H. Ma, X. X. Zhou, L. Perrone, Haibing Hu, L. L. Ma, H. Y. Jia, G. Mancarella, B. Bartoli, Cunfeng Feng, M. Iacovacci, Z. G. Yao, Bartoli, B., Bernardini, P., Bi, X. J., Cao, Z., Catalanotti, S., Chen, S. Z., Chen, T. L., Cui, S. W., Dai, B. Z., D’Amone, A., Danzengluobu, Null, De Mitri, I., Piazzoli, B. D’Ettorre, Di Girolamo, T., Di Sciascio, G., Feng, C. F., Feng, Z. Y., Gao, W., Gou, Q. B., Guo, Y. Q., He, H. H., Hu, Haibing, Hu, Hongbo, Iacovacci, M., Iuppa, R., Jia, H. Y., Labaciren, Null, Li, H. J., Liu, C., Liu, J., Liu, M. Y., Lu, H., Ma, L. L., Ma, X. H., Mancarella, G., Mari, S. M., Marsella, G., Mastroianni, S., Montini, P., Ning, C. C., Perrone, L., Pistilli, P., Ruffolo, D., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, H., Wu, C. Y., Wu, H. R., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, L., Zhang, X. Y., Zhang, Y., Zhao, J., Zhaxiciren, Null, Zhaxisangzhu, Null, Zhou, X. X., Zhu, F. R., Zhu, Q. Q., D'Amone, A., Piazzoli, B. D'Ettorre, Mastroianni, Stefano, Danzengluobu, null, Labaciren, null, Zhaxiciren, null, and Zhaxisangzhu, null
Subjects: Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Cosmic ray, 01 natural sciences, cosmic rays, 0103 physical sciences, Anisotropy, 010303 astronomy & astrophysics, Argo, cosmic ray, Astroparticle physics, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), 010308 nuclear & particles physics, Settore FIS/01 - Fisica Sperimentale, Northern Hemisphere, Astronomy, astroparticle physic, Astronomy and Astrophysics, astroparticle physics, cosmic ray anysotropy, argo-ybj, Astronomy and Astrophysic, astroparticle physics, Space and Planetary Science, 13. Climate action, Astrophysics - High Energy Astrophysical Phenomena
Abstract: This paper reports on the observation of the sidereal large-scale anisotropy of cosmic rays using data collected by the ARGO-YBJ experiment over 5 years (2008-2012). This analysis extends previous work limited to the period from 2008 January to 2009 December, near the minimum of solar activity between cycles 23 and 24. With the new data sample, the period of solar cycle 24 from near minimum to maximum is investigated. A new method is used to improve the energy reconstruction, allowing us to cover a much wider energy range, from 4 to 520 TeV. Below 100 TeV, the anisotropy is dominated by two wide regions, the so-called “tail-in” and “loss-cone” features. At higher energies, a dramatic change of the morphology is confirmed. The yearly time dependence of the anisotropy is investigated. Finally, no noticeable variation of cosmic-ray anisotropy with solar activity is observed for a median energy of 7 TeV.
Published: 2018
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12. Detection of thermal neutrons with the PRISMA-YBJ array in extensive air showers selected by the ARGO-YBJ experiment

Author: M. Zha, Labaciren, C. C. Ning, O. B. Shchegolev, L. Zhang, T. L. Chen, C. Vigorito, Z. Y. Cai, Zhenyong Feng, P. Bernardini, P. Salvini, Hm Zhang, C. Y. Wu, G. Marsella, C. Q. Liu, Q. B. Gou, V. Volchenko, L. L. Ma, P. Vallania, Zhengguo Cao, R. Santonico, H. H. He, H. Lu, G. Mancarella, H. Wang, Danzengluobu, J. K. K. Liu, B. D'Ettorre Piazzoli, A. D'Amone, Q. Q. Zhu, A. F. Yuan, F. Shi, X. W. Guo, S. M. Mari, P. R. Shen, X. C. Yang, X. X. Zhou, T. Di Girolamo, L. Xue, V. V. Alekseenko, Yu. V. Stenkin, Zhaxiciren, Y. H. Tan, Zhaxisangzhu, Hongbo Hu, V. Aynutdinov, Cunfeng Feng, S. W. Cui, V.I. Stepanov, Yicheng Guo, X. J. Bi, Ye Liu, S. Vernetto, Q. Y. Yang, S. Z. Chen, F. R. Zhu, S. Mastroianni, H. Y. Jia, H. J. Li, H. R. Wu, P. Montini, X. H. Ma, V. Rulev, Minghui Liu, A. Surdo, G. Di Sciascio, Zhaoyang Feng, X. Y. Zhang, Xiangdong Sheng, J. Zhao, S. Catalanotti, B. Z. Dai, Y. J. Zhang, R. Iuppa, B. Bartoli, I. De Mitri, Haibing Hu, Z. G. Yao, L. Perrone, P. Pistilli, H. M. Zhang, M. Iacovacci, Bartoli, B., Bernardini, P., Bi, X. J., Cao, Z., Catalanotti, S., Chen, S. Z., Chen, T. L., Cui, S. W., Dai, B. Z., D’Amone, A., Danzengluobu, Null, De Mitri, I., D’Ettorre Piazzoli, B., Di Girolamo, T., Di Sciascio, G., Feng, C. F., Feng, Zhaoyang, Feng, Zhenyong, Gou, Q. B., Guo, Y. Q., He, H. H., Hu, Haibing, Hu, Hongbo, Iacovacci, M., Iuppa, R., Jia, H. Y., Labaciren, Null, Li, H. J., Liu, C., Liu, J., Liu, M. Y., Lu, H., Ma, L. L., Ma, X. H., Mancarella, G., Mari, Stefano Maria, Marsella, G., Mastroianni, S., Montini, Paolo, Ning, C. C., Perrone, L., Pistilli, Pio, Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, H., Wu, C. Y., Wu, H. R., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, L., Zhang, X. Y., Zhang, Y., Zhao, J., Zhaxiciren, Null, Zhaxisangzhu, Null, Zhou, X. X., Zhu, F. R., Zhu, Q. Q., Stenkin, Y. u. V., Alekseenko, V. V., Aynutdinov, V., Cai, Z. Y., Guo, X. W., Liu, Y., Rulev, V., Shchegolev, O. B., Stepanov, V., Volchenko, V., Zhang, H., Bartoli, B, Bernardini, Paolo, Bi, Xj, Cao, Z, Catalanotti, S, Chen, Sz, Chen, Tl, Cui, Sw, Dai, Bz, D'Amone, Antonio, Danzengluobu, DE MITRI, Ivan, Piazzoli, Bd, Di Girolamo, T, Di Sciascio, G, Feng, Cf, Feng, Zy, Gou, Qb, Guo, Yq, He, Hh, Hu, H, Iacovacci, M, Iuppa, R, Jia, Hy, Labaciren, Li, Hj, Liu, C, Liu, J, Liu, My, Lu, H, Ma, Ll, Ma, Xh, Mancarella, Giovanni, Mari, Sm, Marsella, Giovanni, Mastroianni, S, Montini, P, Ning, Cc, Perrone, Lorenzo, Pistilli, P, Salvini, P, Santonico, R, Shen, Pr, Sheng, Xd, Shi, F, Surdo, A, Tan, Yh, Vallania, P, Vernetto, S, Vigorito, C, Wang, H, Wu, Cy, Wu, Hr, Xue, L, Yang, Qy, Yang, Xc, Yao, Zg, Yuan, Af, Zha, M, Zhang, Hm, Zhang, L, Zhang, Xy, Zhang, Y, Zhao, J, Zhaxiciren, Zhaxisangzhu, Zhou, Xx, Zhu, Fr, Zhu, Qq, Stenkin, Yv, Alekseenko, Vv, Aynutdinov, V, Cai, Zy, Guo, Xw, Liu, Y, Rulev, V, Shchegolev, Ob, Stepanov, V, Volchenko, V, Zhang, H[ 7 ] . . . Less, Bartoli, Bruno, Catalanotti, Sergio, D'ETTORRE PIAZZOLI, Benedetto, DI GIROLAMO, Tristano, Iacovacci, Michele, Mari, S. M., Montini, P., and Pistilli, P.
Subjects: Physics - Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Extensive air shower, FOS: Physical sciences, Cosmic ray, 01 natural sciences, Nuclear physics, EN-detector, Hadronic component, RPC, Thermal neutron, Astronomy and Astrophysics, Observatory, Coincident, 0103 physical sciences, 010306 general physics, Cosmic-ray observatory, Instrumentation and Methods for Astrophysics (astro-ph.IM), High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Calorimeter (particle physics), 010308 nuclear & particles physics, Astrophysics::Instrumentation and Methods for Astrophysics, Instrumentation and Detectors (physics.ins-det), Neutron temperature, Air shower, High Energy Physics::Experiment, Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract: We report on a measurement of thermal neutrons, generated by the hadronic component of extensive air showers (EAS), by means of a small array of EN-detectors developed for the PRISMA project (PRImary Spectrum Measurement Array), novel devices based on a compound alloy of ZnS(Ag) and $^{6}$LiF. This array has been operated within the ARGO-YBJ experiment at the high altitude Cosmic Ray Observatory in Yangbajing (Tibet, 4300 m a.s.l.). Due to the tight correlation between the air shower hadrons and thermal neutrons, this technique can be envisaged as a simple way to estimate the number of high energy hadrons in EAS. Coincident events generated by primary cosmic rays of energies greater than 100 TeV have been selected and analyzed. The EN-detectors have been used to record simultaneously thermal neutrons and the air shower electromagnetic component. The density distributions of both components and the total number of thermal neutrons have been measured. The correlation of these data with the measurements carried out by ARGO-YBJ confirms the excellent performance of the EN-detector., 35 pages, 16 figures
Published: 2016

13. 4.5 YEARS OF MULTI-WAVELENGTH OBSERVATIONS OF MRK 421 DURING THE ARGO-YBJ AND FERMI COMMON OPERATION TIME

Author: B. Bartoli, A. F. Yuan, Huihai He, Xiangdong Sheng, L. Perrone, A. D'Amone, S. W. Cui, Haibing Hu, Longzhou Zhang, Y. Zhang, B. D'Ettorre Piazzoli, Labaciren, Zhaxiciren, Q. Y. Yang, Q. Q. Zhu, X. C. Yang, C. Y. Wu, Y. Q. Guo, R. Santonico, L. Xue, F. R. Zhu, S. M. Mari, Zihuang Cao, J. K. K. Liu, Q. B. Gou, X. Y. Zhang, Minghui Liu, Hong-peng Lu, I. De Mitri, G. Mancarella, Carlo Vigorito, C. X. Liu, P. Pistilli, H. M. Zhang, X. X. Zhou, J. B. Zhao, T. L. Chen, P. Salvini, A. Surdo, M. Iacovacci, M. Zha, Y. H. Tan, Z. G. Yao, H. J. Li, H. R. Wu, B. Z. Dai, X. J. Bi, Danzengluobu, Fudong Shi, Paolo Bernardini, S. Mastroianni, L. L. Ma, H. W. Wang, G. Marsella, Zhenyong Feng, S. Z. Chen, G. Di Sciascio, P. Montini, X. H. Ma, Hongbo Hu, C. F. Feng, Piero Vallania, H. Y. Jia, Pengnian Shen, S. Catalanotti, T. Di Girolamo, R. Iuppa, S. Vernetto, Zhaxisangzhu, Chang-Chun Ning, Zhaoyang Feng, Bartoli, B., Bernardini, P., Bi, X. J., Cao, Z., Catalanotti, S., Chen, S. Z., Chen, T. L., Cui, S. W., Dai, B. Z., D'Amone, A., Danzengluobu, Null, De Mitri, I., Piazzoli, B. D'Ettorre, Di Girolamo, T., Di Sciascio, G., Feng, C. F., Feng, Zhaoyang, Feng, Zhenyong, Gou, Q. B., Guo, Y. Q., He, H. H., Hu, Haibing, Hu, Hongbo, Iacovacci, M., Iuppa, R., Jia, H. Y., Labaciren, Null, Li, H. J., Liu, C., Liu, J., Liu, M. Y., Lu, H., Ma, L. L., Ma, X. H., Mancarella, G., Mari, Stefano Maria, Marsella, G., Mastroianni, S., Montini, Paolo, Ning, C. C., Perrone, L., Pistilli, Pio, Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, H., Wu, C. Y., Wu, H. R., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, L., Zhang, X. Y., Zhang, Y., Zhao, J., Zhaxiciren, Null, Zhaxisangzhu, Null, Zhou, X. X., Zhu, F. R., Zhu, Q. Q., Bartoli, Bruno, Catalanotti, Sergio, D’Amone, A., Mitri, I. De, D'ETTORRE PIAZZOLI, Benedetto, DI GIROLAMO, Tristano, Iacovacci, Michele, Mari, S. M., Montini, P., Pistilli, P., Bernardini, Paolo, Xje, X. J. E, Cao, Z. E, D'Amone, Antonio, Danzengluobu, DE MITRI, Ivan, Piazzoli, B. D., Feng, Z., Hu, H., Labaciren, Mancarella, Giovanni, Marsella, Giovanni, Perrone, Lorenzo, Yao, Z. G. E, Yuan, A., F., Zhaxiciren, and Zhaxisangzhu
Subjects: Astrophysics::High Energy Astrophysical Phenomena, galaxies: active, FOS: Physical sciences, Cosmic ray, Astrophysics, Electron, BL Lacertae objects: individual (Markarian 421), 01 natural sciences, 7. Clean energy, law.invention, Acceleration, law, 0103 physical sciences, Emission spectrum, Blazar, 010303 astronomy & astrophysics, cosmic ray, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, gamma-rays: general, radiation mechanisms: non-thermal, Astronomy and Astrophysics, Space and Planetary Science, 010308 nuclear & particles physics, Spectral density, Astronomy and Astrophysic, Synchrotron, gamma-ray Anstronomy, LARGE-AREA TELESCOPE, GAMMA-RAY EMISSION, BL-LAC OBJECTS, ENERGY-DISTRIBUTIONS, PHYSICAL-PROPERTIES, 13. Climate action, Astrophysics - High Energy Astrophysical Phenomena, SPECTRAL EVOLUTION, SHOCK ACCELERATION, FEBRUARY 2010, TEV BLAZARS, GIANT FLARE, Fermi Gamma-ray Space Telescope
Abstract: We report on the extensive multi-wavelength observations of the blazar Markarian 421 (Mrk 421) covering radio to gamma-rays, during the 4.5 year period of ARGO-YBJ and Fermi common operation time, from August 2008 to February 2013. In particular, thanks to the ARGO-YBJ and Fermi data, the whole energy range from 100 MeV to 10 TeV is covered without any gap. In the observation period, Mrk 421 showed both low and high activity states at all wavebands. The correlations among flux variations in different wavebands were analyzed. Seven large flares, including five X-ray flares and two GeV gamma-ray flares with variable durations (3-58 days), and one X-ray outburst phase were identified and used to investigate the variation of the spectral energy distribution with respect to a relative quiescent phase. During the outburst phase and the seven flaring episodes, the peak energy in X-rays is observed to increase from sub-keV to few keV. The TeV gamma-ray flux increases up to 0.9-7.2 times the flux of the Crab Nebula. The behavior of GeV gamma-rays is found to vary depending on the flare, a feature that leads us to classify flares into three groups according to the GeV flux variation. Finally, the one-zone synchrotron self-Compton model was adopted to describe the emission spectra. Two out of three groups can be satisfactorily described using injected electrons with a power-law spectral index around 2.2, as expected from relativistic diffuse shock acceleration, whereas the remaining group requires a harder injected spectrum. The underlying physical mechanisms responsible for different groups may be related to the acceleration process or to the environment properties., 17 pages, 9 figures, 5 tables, Accepted for publication in ApJS
Published: 2016
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14. OBSERVATION OF THE TeV GAMMA-RAY SOURCE MGRO J1908+06 WITH ARGO-YBJ

Author: B. Bartoli1, 2, P. Bernardini3, 4, X. J. Bi5, C. Bleve3, I. Bolognino6, 7, P. Branchini8, A. Budano8, A. K. Calabrese Melcarne9, P. Camarri10, Z. Cao5, R. Cardarelli11, S. Catalanotti1, C. Cattaneo7, S. Z. Chen5, T. L. Chen12, Y. Chen5, P. Creti4, S. W. Cui13, B. Z. Dai14, G. D’Al´ı Staiti15, 16, Danzengluobu12, M. Dattoli17, 18, 19, I. De Mitri3, B. D’Ettorre Piazzoli1, T. Di Girolamo1, X. H. Ding12, G. Di Sciascio11, C. F. Feng20, Zhaoyang Feng5, Zhenyong Feng21, F. Galeazzi8, E. Giroletti6, Q. B. Gou5, Y. Q. Guo5, H. H. He5, Haibing Hu12, Hongbo Hu5, Q. Huang21, M. Iacovacci1, R. Iuppa10, I. James8, H. Y. Jia21, Labaciren12, H. J. Li12, J. Y. Li20, X. X. Li5, G. Liguori6, C. Liu5, C. Q. Liu14, J. Liu14, M. Y. Liu12, H. Lu5, X. H. Ma5, G. Mancarella3, 8, 22, G. Marsella4, D. Martello3, S. Mastroianni2, P. Montini8, C. C. Ning12, A. Pagliaro16, M. Panareo4, B. Panico10, L. Perrone4, P. Pistilli8, X. B. Qu20, F. Ruggieri8, P. Salvini7, R. Santonico10, P. R. Shen5, X. D. Sheng5, F. Shi5, C. Stanescu8, A. Surdo4, Y. H. Tan5, P. Vallania17, S. Vernetto17, C. Vigorito18, B. Wang5, H. Wang5, C. Y. Wu5, H. R. Wu5, B. Xu21, L. Xue20, Y. X. Yan14, Q. Y. Yang14, X. C. Yang14, Z. G. Yao5, A. F. Yuan12, M. Zha5, H. M. Zhang5, Jilong Zhang5, Jianli Zhang5, L. Zhang14, P. Zhang14, X. Y. Zhang20, Y. Zhang5, Zhaxiciren12, Zhaxisangzhu12, X. X. Zhou21, F. R. Zhu21, Q. Q. Zhu5, G. Zizzi91 Dipartimento di Fisica dell’Universit`a di Napoli 'Federico II, ' Complesso Universitario di Monte Sant’Angelo, via Cinthia, 80126 Napoli, Italy2 Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Complesso Universitario di Monte Sant’Angelo, Italy3 Dipartimento di Matematica e. Fisica 'Ennio De Giorgi, ' Universit`a del Salento, via per Arnesano, 73100 Lecce, Italy4 Istituto Nazionale di Fisica Nucleare, Sezione di Lecce, Italy5 Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, P. O. Box 918, 100049 Beijing, China6 Dipartimento di Fisica Nucleare e. Teorica dell’Universit`a di Pavia, via Bassi 6, 27100 Pavia, Italy7 Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, Italy8 Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tre, via della Vasca Navale 84, 00146 Roma, Italy9 Istituto Nazionale di Fisica Nucleare CNAF, Viale Berti Pichat 6/2, 40127 Bologna, Italy10 Dipartimento di Fisica dell’Universit`a di Roma 'Tor Vergata, ' via della Ricerca Scientifica 1, 00133 Roma, Italy11 Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tor Vergata, via della Ricerca Scientifica 1, Italy12 Tibet University, 850000 Lhasa, Xizang, China13 Hebei Normal University, Shijiazhuang 050016, Hebei, China14 Yunnan University, 2 North Cuihu R.d., 650091 Kunming, Yunnan, China15 Dipartimento di Fisica, Universit`a degli Studi di Palermo, Viale delle Scienze, Edificio 18, 90128 Palermo, Italy16 Istituto Nazionale di Fisica Nucleare, Sezione di Catania, Viale A. Doria 6, 95125 Catania, Italy17 Osservatorio Astrofisico di Torino dell’Istituto Nazionale di Astrofisica, corso Fiume 4, 10133 Torino, Italy18 Istituto Nazionale di Fisica Nucleare, Sezione di Torino, via P. Giuria 1, 10125 Torino, Italy19 Dipartimento di Fisica dell’Universit`a di Torino, Italy20 Shandong University, 250100 Jinan, Shandong, China21 Southwest Jiaotong University, 610031 Chengdu, Sichuan, China22 Dipartimento di Fisica dell’Universit`a 'Roma Tre, ' via della Vasca Navale 84, Italy23 Istituto di Astrofisica Spaziale e. Fisica Cosmica dell’Istituto Nazionale di Astrofisica, via La Malfa 153, 90146 Palermo, Italy, MARI, Stefano Maria, Bartoli, B, Bernardini, P, Bi, XJ, Bleve, C, Bolognino, I, Branchini, P, Budano, A, Calabrese Melcarne, AK, Camarri, P, Cao, Z, Cardarelli, R, Catalanotti, S, Cattaneo, C, Chen, SZ, Chen, TL, Chen, Y, Creti, P, Cui, SW, Dai, BZ, D’Ali Staiti, G, Danzengluobu, Dattoli, M, De Mitri, I, D’Ettorre Piazzoli, B, Di Girolamo, T, Ding, XH, Di Sciascio, G, Feng, CF, Feng, ZYa, Feng, ZYo, Galeazzi, F, Giroletti, E, Gou, QB, Guo, YQ, He, HH, Hu, HBi, Hu, HBo, Huang, Q, Iacovacci, M, Iuppa, R, James, I, Jia, HY, Labaciren, Li, HJ, Li, JY, Li, XX, Liguori, G, Liu, C, Liu, CQ, Liu, J, Liu, MY, Lu, H, Ma, XH, Mancarella, G, Mari, SM, Marsella, G, Martello, D, Mastroianni, S, Montini, P, Ning, CC, Pagliaro, A, Panareo, M, Panico, B, Perrone, L, Pistilli, P, Qu, XB, Ruggieri, F, Salvini, P, Santonico, R, Shen, PR, Sheng, XD, Shi, F, Stanescu, C, Surdo, A, Tan, YH, Vallania, P, Vernetto, S, Vigorito, C, Wang, B, Wang, H, Wu, CY, Wu, HR, Xu, B, Xue, L, Yan, YX, Yang, QY, Yang, XC, Yao, ZG, Yuan, AF, Zha, M, Zhang, HM, Zhang, JLi, Zhang, JLo, Zhang, L, Zhang, P, Zhang, XY, Zhang, Y, Zhaxiciren, Zhaxisangzhu, Zhou, XX, Zhu, FR, Zhu, QQ, Zizzi, G, Bartoli, Bruno, Bernardini, P., X. J., Bi, Bleve, C., Bolognino, I., Branchini, P., Budano, A., Calabrese Melcarne, A. K., Camarri, P., Cao, Z., Cardarelli, R., Catalanotti, Sergio, Cattaneo, C., Chen, S. Z., Chen, T. L., Chen, Y., Creti, P., Cui, S. W., Dai, B. Z., D'Al? Staiti, G., Dattoli, M., De Mitri, I., D'ETTORRE PIAZZOLI, Benedetto, DI GIROLAMO, Tristano, Ding, X. H., Di Sciascio, G., Feng, C. F., Zhaoyang, Feng, Zhenyong, Feng, Galeazzi, F., Giroletti, E., Gou, Q. B., Guo, Y. Q., H. H., He, Haibing, Hu, Hongbo, Hu, Huang, Q., Iacovacci, Michele, Iuppa, R., James, I., Jia, H. Y., H. J., Li, J. Y., Li, X. X., Li, Liguori, G., Liu, C., Liu, C. Q., Liu, J., Liu, M. Y., Lu, H., X. H., Ma, Mancarella, G., Mari, S. M., Marsella, G., Martello, D., Mastroianni, S., Montini, P., Ning, C. C., Pagliaro, A., Panareo, M., Panico, B., Perrone, L., Pistilli, P., X. B., Qu, Ruggieri, F., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Stanescu, C., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, B., Wang, H., C. Y., Wu, H. R., Wu, Xu, B., Xue, L., Yan, Y. X., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Jilong, Zhang, Jianli, Zhang, Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhaxiciren, Zhaxisangzhu, Zhou, X. X., Zhu, F. R., Zhu, Q. Q., Zizzi, G., B., Bartoli1, P., Bernardini3, X. J., Bi5, C., Bleve3, I., Bolognino6, P., Branchini8, A., Budano8, A. K., Calabrese Melcarne9, P., Camarri10, Z., Cao5, R., Cardarelli11, S., Catalanotti1, C., Cattaneo7, S. Z., Chen5, T. L., Chen12, Y., Chen5, P., Creti4, S. W., Cui13, B. Z., Dai14, G., D’Al´ı Staiti15, 16, Danzengluobu12, M., Dattoli17, 18, 19, I., De Mitri3, B., D’Ettorre Piazzoli1, T., Di Girolamo1, X. H., Ding12, G., Di Sciascio11, C. F., Feng20, Zhaoyang, Feng5, Zhenyong, Feng21, F., Galeazzi8, E., Giroletti6, Q. B., Gou5, Y. Q., Guo5, H. H., He5, Haibing, Hu12, Hongbo, Hu5, Q., Huang21, M., Iacovacci1, R., Iuppa10, I., James8, H. Y., Jia21, Labaciren12, H. J., Li12, J. Y., Li20, X. X., Li5, G., Liguori6, C., Liu5, C. Q., Liu14, J., Liu14, M. Y., Liu12, H., Lu5, X. H., Ma5, G., Mancarella3, Mari, Stefano Maria, 8, 22, G., Marsella4, D., Martello3, S., Mastroianni2, Montini8, P., C. C., Ning12, A., Pagliaro16, M., Panareo4, B., Panico10, L., Perrone4, P., Pistilli8, X. B., Qu20, Ruggieri8, F., P., Salvini7, R., Santonico10, P. R., Shen5, X. D., Sheng5, F., Shi5, C., Stanescu8, A., Surdo4, Y. H., Tan5, P., Vallania17, S., Vernetto17, C., Vigorito18, B., Wang5, H., Wang5, C. Y., Wu5, H. R., Wu5, B., Xu21, L., Xue20, Y. X., Yan14, Q. Y., Yang14, X. C., Yang14, Z. G., Yao5, A. F., Yuan12, M., Zha5, H. M., Zhang5, Jilong, Zhang5, Jianli, Zhang5, L., Zhang14, P., Zhang14, X. Y., Zhang20, Y., Zhang5, Zhaxiciren12, Zhaxisangzhu12, X. X., Zhou21, F. R., Zhu21, Q. Q., Zhu5, G., Zizzi91 Dipartimento di Fisica dell’Universit`a di Napoli 'Federico II, ' Complesso Universitario di Monte, Sant’Angelo, Via, Cinthia, 80126, Napoli, Italy2 Istituto Nazionale di Fisica, Nucleare, Sezione di, Napoli, Complesso Universitario di Monte, Sant’Angelo, Italy3 Dipartimento di Matematica e., Fisica 'Ennio De Giorgi, ' Universit`a del, Salento, via per, Arnesano, 73100, Lecce, Italy4 Istituto Nazionale di Fisica, Nucleare, Sezione di, Lecce, Italy5 Key Laboratory of Particle, Astrophysic, Institute of High Energy, Physic, Chinese Academy of, Science, P. O., Box 918, 100049, Beijing, China6 Dipartimento di Fisica Nucleare e., Teorica dell’Universit`a di Pavia, via Bassi, 6, 27100, Pavia, Italy7 Istituto Nazionale di Fisica, Nucleare, Sezione di, Pavia, Italy8 Istituto Nazionale di Fisica, Nucleare, Sezione di Roma, Tre, via della Vasca Navale, 84, 00146, Roma, Italy9 Istituto Nazionale di Fisica Nucleare, Cnaf, Viale Berti Pichat, 6/2, 40127, Bologna, Italy10 Dipartimento di Fisica dell’Universit`a di Roma 'Tor, Vergata, ' via della Ricerca Scientifica, 1, 00133, Roma, Italy11 Istituto Nazionale di Fisica, Nucleare, Sezione di Roma Tor, Vergata, via della Ricerca Scientifica, 1, Italy12 Tibet, University, 850000, Lhasa, Xizang, China13 Hebei Normal, University, Shijiazhuang, 050016, Hebei, China14 Yunnan, University, 2 North Cuihu, R. d., 650091, Kunming, Yunnan, China15 Dipartimento di, Fisica, Universit`a degli Studi di, Palermo, Viale delle, Scienze, Edificio, 18, 90128, Palermo, Italy16 Istituto Nazionale di Fisica, Nucleare, Sezione di, Catania, Viale A., Doria 6, 95125, Catania, Italy17 Osservatorio Astrofisico di Torino dell’Istituto Nazionale di, Astrofisica, corso Fiume, 4, 10133, Torino, Italy18 Istituto Nazionale di Fisica, Nucleare, Sezione di, Torino, via P., Giuria 1, 10125, Torino, Italy19 Dipartimento di Fisica dell’Universit`a di, Torino, Italy20 Shandong, University, 250100, Jinan, Shandong, China21 Southwest Jiaotong, University, 610031, Chengdu, Sichuan, China22 Dipartimento di Fisica dell’Universit`a 'Roma, Tre, ' via della Vasca Navale, 84, Italy23 Istituto di Astrofisica Spaziale e., Fisica Cosmica dell’Istituto Nazionale di Astrofisica, via La Malfa, 153, 90146, Palermo, Italy, B., Bartoli, Bernardini, Paolo, C., Bleve, I., Bolognino, P., Branchini, A., Budano, A. K., Calabrese Melcarne, P., Camarri, Z., Cao, R., Cardarelli, S., Catalanotti, C., Cattaneo, S. Z., Chen, T. L., Chen, Y., Chen, P., Creti, S. W., Cui, B. Z., Dai, G., D’Alì Staiti, M., Dattoli, DE MITRI, Ivan, B., D’Ettorre Piazzoli, T., Di Girolamo, X. H., Ding, G., Di Sciascio, C. F., Feng, F., Galeazzi, E., Giroletti, Q. B., Gou, Y. Q., Guo, Q., Huang, M., Iacovacci, R., Iuppa, I., Jame, H. Y., Jia, G., Liguori, C., Liu, C. Q., Liu, J., Liu, M. Y., Liu, H., Lu, Mancarella, Giovanni, S. M., Mari, Marsella, Giovanni, Martello, Daniele, S., Mastroianni, P., Montini, C. C., Ning, A., Pagliaro, Panareo, Marco, B., Panico, Perrone, Lorenzo, P., Pistilli, F., Ruggieri, P., Salvini, R., Santonico, P. R., Shen, X. D., Sheng, F., Shi, C., Stanescu, A., Surdo, Y. H., Tan, P., Vallania, S., Vernetto, C., Vigorito, B., Wang, H., Wang, B., Xu, L., Xue, Y. X., Yan, Q. Y., Yang, X. C., Yang, Z. G., Yao, A. F., Yuan, M., Zha, H. M., Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhang, X. X., Zhou, F. R., Zhu, Q. Q., Zhu, and G., Zizzi
Subjects: Astrophysics::High Energy Astrophysical Phenomena, Astrophysics, general – pulsars: individual (MGRO J1908+06) [gamma rays], 7. Clean energy, 01 natural sciences, Pulsar wind nebula, Luminosity, Settore FIS/05 - Astronomia E Astrofisica, Pulsar, 0103 physical sciences, 010303 astronomy & astrophysics, pulsar, Physics, 010308 nuclear & particles physics, gamma rays: general – pulsars: individual (MGRO J1908+06), Settore FIS/01 - Fisica Sperimentale, Gamma ray, Astronomy and Astrophysics, (MGRO J1908+06), Air shower, Crab Nebula, 13. Climate action, Space and Planetary Science, gamma ray, Milagro, High Energy Physics::Experiment, Astrophysics - High Energy Astrophysical Phenomena, Energy (signal processing)
Abstract: The extended gamma ray source MGRO J1908+06, discovered by the Milagro air shower detector in 2007, has been observed for about 4 years by the ARGO-YBJ experiment at TeV energies, with a statistical significance of 6.2 standard deviations. The peak of the signal is found at a position consistent with the pulsar PSR J1907+0602. Parametrizing the source shape with a two-dimensional Gauss function we estimate an extension \sigma = 0.49 \pm 0.22 degrees, consistent with a previous measurement by the Cherenkov Array H.E.S.S.. The observed energy spectrum is dN/dE = 6.1 \pm 1.4 \times 10^-13 (E/4 TeV)^{-2.54 \pm 0.36} photons cm^-2 s^-1 TeV^-1, in the energy range 1-20 TeV. The measured gamma ray flux is consistent with the results of the Milagro detector, but is 2-3 times larger than the flux previously derived by H.E.S.S. at energies of a few TeV. The continuity of the Milagro and ARGO-YBJ observations and the stable excess rate observed by ARGO-YBJ along 4 years of data taking support the identification of MGRO J1908+06 as the steady powerful TeV pulsar wind nebula of PSR J1907+0602, with an integrated luminosity above 1 TeV about 1.8 times the Crab Nebula luminosity., Comment: 6 pages, accepted for pubblication by ApJ. Replaced to correct the author list
Published: 2012

15. Observation of TeV gamma rays from the Cygnus region with the ARGO-YBJ experiment

Author: Carla Bleve, Q. Q. Zhu, B. S. Wang, Zhaxisangzhu, Hongbo Hu, C. F. Feng, B. Bartoli, Carlo Vigorito, S. M. Mari, A. F. Yuan, X. D. Sheng, Zhengguo Cao, Paolo Montini, T. Di Girolamo, G. Liguori, B. D'Ettorre Piazzoli, R. Iuppa, L. L. Ma, Haibing Hu, Jilong Zhang, Y. Q. Guo, E. Giroletti, Y. B. Chen, H. J. Li, Chang-Chun Ning, Zhaoyang Feng, H. R. Wu, F. Ruggieri, Y. Zhang, P. Bernardini, S. W. Cui, D. Martello, B. Panico, Labaciren, Jianli Zhang, L. Xue, M. Iacovacci, M. Zha, M. Y. Liu, P. R. Shen, X. Y. Zhang, B. Z. Dai, J. K. K. Liu, Antonio Budano, P. Pistilli, H. M. Zhang, X. X. Zhou, C. Cattaneo, H. Y. Jia, X. H. Ding, Hong-peng Lu, Q. Y. Yang, Zhaxiciren, P. Creti, A. K. Calabrese Melcarne, P. F. Zhang, Cristian Stanescu, P. Branchini, A. Surdo, Roberto Cardarelli, Danzengluobu, G. Zizzi, Q. Huang, X. J. Bi, G. Marsella, Zhenyong Feng, F. R. Zhu, S. Vernetto, C. Liu, Bingwei Xu, X. X. Li, S. Catalanotti, Paolo Camarri, Z. G. Yao, H.H. He, M. Dattoli, M. Panareo, Huaguang Wang, Y. H. Tan, X. H. Ma, Q. B. Gou, I. De Mitri, J. B. Zhao, P. Salvini, Fudong Shi, A. Pagliaro, S. Mastroianni, J. Y. Li, T. L. Chen, I. Bolognino, S. Z. Chen, Giovanni Mancarella, G. Di Sciascio, X. C. Yang, R. Santonico, Irina James, L. Perrone, F. Galeazzi, Longzhou Zhang, C. Y. Wu, C. Q. Liu, G. D'Alí Staiti, P. Vallania, B., Bartoli, Bernardini, Paolo, X. J., Bi, C., Bleve, I., Bolognino, P., Branchini, A., Budano, A. K., Calabrese Melcarne, P., Camarri, Z., Cao, R., Cardarelli, S., Catalanotti, C., Cattaneo, S. Z., Chen, T. L., Chen, Y., Chen, P., Creti, S. W., Cui, B. Z., Dai, G., D'Alí Staiti, Danzengluobu, M., Dattoli, DE MITRI, Ivan, B., D'Ettorre Piazzoli, T., Di Girolamo, X. H., Ding, G., Di Sciascio, C. F., Feng, Zhaoyang, Feng, Zhenyong, Feng, F., Galeazzi, E., Giroletti, Q. B., Gou, Y. Q., Guo, H. H., He, Haibing, Hu, Hongbo, Hu, Q., Huang, M., Iacovacci, R., Iuppa, I., Jame, H. Y., Jia, Labaciren, H. J., Li, J. Y., Li, X. X., Li, G., Liguori, C., Liu, C. Q., Liu, J., Liu, M. Y., Liu, H., Lu, L. L., Ma, X. H., Ma, Mancarella, Giovanni, S. M., Mari, Marsella, Giovanni, Martello, Daniele, S., Mastroianni, P., Montini, C. C., Ning, A., Pagliaro, Panareo, Marco, B., Panico, Perrone, Lorenzo, P., Pistilli, F., Ruggieri, P., Salvini, R., Santonico, P. R., Shen, X. D., Sheng, F., Shi, C., Stanescu, A., Surdo, Y. H., Tan, P., Vallania, S., Vernetto, C., Vigorito, B., Wang, H., Wang, C. Y., Wu, H. R., Wu, B., Xu, L., Xue, Q. Y., Yang, X. C., Yang, Z. G., Yao, A. F., Yuan, M., Zha, H. M., Zhang, Jilong, Zhang, Jianli, Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhang, J., Zhao, Zhaxiciren, Zhaxisangzhu, X. X., Zhou, F. R., Zhu, Q. Q., Zhu, G., Zizzi, Bartoli, Bruno, Bernardini, P., Bleve, C., Bolognino, I., Branchini, P., Budano, A., A. K. C., Camarri, P., Cao, Z., Cardarelli, R., Catalanotti, Sergio, Cattaneo, C., Chen, S. Z., Chen, T. L., Chen, Y., Creti, P., Cui, S. W., Dai, B. Z., Staiti, G. D., Dattoli, M., Mitri, I. D., D'ETTORRE PIAZZOLI, Benedetto, DI GIROLAMO, Tristano, Ding, X. H., Sciascio, G. D., Feng, C. F., Feng, Z. Y., Galeazzi, F., Giroletti, E., Gou, Q. B., Guo, Y. Q., H. B., Hu, Huang, Q., Iacovacci, Michele, Iuppa, R., James, I., Jia, H. Y., Liguori, G., Liu, C., Liu, C. Q., Liu, J., Liu, M. Y., Lu, H., Mancarella, G., Mari, S. M., Marsella, G., Martello, D., Mastroianni, S., Montini, P., Ning, C. C., Pagliaro, A., Panareo, M., Panico, B., Perrone, L., Pistilli, P., Ruggieri, F., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Stanescu, C., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, B., Wang, H., Xu, B., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, J. L., Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhao, J., Zhou, X. X., Zhu, F. R., Zhu, Q. Q., Zizzi, G., Bartoli, B, Bernardini, P, Bi, XJ, Bleve, C, Bolognino, I, Branchini, P, Budano, A, Calabrese Melcarne, AK, Camarri, P, Cao, Z, Cardarelli, R, Catalanotti, S, Cattaneo, C, Chen, SZ, Chen, TL, Chen, Y, Creti, P, Cui, SW, Dai, BZ, D’Ali Staiti, G, Dattoli, M, De Mitri, I, D’Ettorre Piazzoli, B, Di Girolamo, T, Ding, XH, Di Sciascio, G, Feng, CF, Feng, ZYa, Feng, ZYo, Galeazzi, F, Giroletti, E, Gou, QB, Guo, YQ, He, HH, Hu, HBi, Hu, HBo, Huang, Q, Iacovacci, M, Iuppa, R, James, I, Jia, HY, Li, HJ, Li, JY, Li, XX, Liguori, G, Liu, C, Liu, CQ, Liu, J, Liu, MY, Lu, H, Ma, LL, Ma, XH, Mancarella, G, Mari, SM, Marsella, G, Martello, D, Mastroianni, S, Montini, P, Ning, CC, Pagliaro, A, Panareo, M, Panico, B, Perrone, L, Pistilli, P, Ruggieri, F, Salvini, P, Santonico, R, Shen, PR, Sheng, XD, Shi, F, Stanescu, C, Surdo, A, Tan, YH, Vallania, P, Vernetto, S, Vigorito, C, Wang, B, Wang, H, Wu, CY, Wu, HR, Xu, B, Xue, L, Yang, QY, Yang, XC, Yao, ZG, Yuan, AF, M. Zha, M, Zhang, HM, Zhang, JLi, Zhang, JLo, Zhang, L, Zhang, P, Zhang, XY, Zhang, Y, Zhao, J, Zhaxiciren, Zhaxisangzhu, Zhou, XX, Zhu, FR, Zhu, QQ, Zizzi, G, Bartoli, B., Bi, X. J., Melcarne A. K., Calabrese, Catalanotti, S., Staiti G., D'Ali, De Mitri, I., Piazzoli B., D'Ettorre, Di Girolamo, T., Di Sciascio, G., Feng, Zhaoyang, Feng, Zhenyong, He, H. H., Hu, Haibing, Hu, Hongbo, Iacovacci, M., Li, H. J., Li, J. Y., Li, X. X., Ma, L. L., Ma, X. H., Mari, Stefano Maria, Wu, C. Y., Wu, H. R., Zhang, Jilong, and Zhang, Jianli
Subjects: Astrophysics::High Energy Astrophysical Phenomena, general – pulsars: individual (MGRO J2019+37 [Gamma rays], Flux, FOS: Physical sciences, Astrophysics, 01 natural sciences, Pulsar wind nebula, general – pulsar, 0103 physical sciences, MILAGRO, 010303 astronomy & astrophysics, DETECTOR, Argo, Physics, CALIBRATION, High Energy Astrophysical Phenomena (astro-ph.HE), 010308 nuclear & particles physics, MGRO J2031+41), Settore FIS/01 - Fisica Sperimentale, Gamma ray, Astronomy and Astrophysics, individual (MGRO J2019+37, MGRO J2031+41), PLANE, 3. Good health, Medium energy, Crab Nebula, gamma ray, 13. Climate action, Space and Planetary Science, GALACTIC SOURCES, J2032+4130, Milagro, gamma rays, general – pulsars, EMISSION, Astrophysics - High Energy Astrophysical Phenomena
Abstract: We report the observation of TeV gamma-rays from the Cygnus region using the ARGO-YBJ data collected from 2007 November to 2011 August. Several TeV sources are located in this region including the two bright extended MGRO J2019+37 and MGRO J2031+41. According to the Milagro data set, at 20 TeV MGRO J2019+37 is the most significant source apart from the Crab Nebula. No signal from MGRO J2019+37 is detected by the ARGO-YBJ experiment, and the derived flux upper limits at 90% confidence level for all the events above 600 GeV with medium energy of 3 TeV are lower than the Milagro flux, implying that the source might be variable and hard to be identified as a pulsar wind nebula. The only statistically significant (6.4 standard deviations) gamma-ray signal is found from MGRO J2031+41, with a flux consistent with the measurement by Milagro., 14 pages, 4 figures
Published: 2012

16. Long-term monitoring of mrk 501 for its very high energy γ emission and a flare in 2011 october

Author: B. Bartoli1, 2, P. Bernardini3, 4, X. J. Bi5, C. Bleve3, I. Bolognino6, 7, P. Branchini8, A. Budano8, A. K. Calabrese Melcarne9, P. Camarri10, Z. Cao5, R. Cardarelli11, S. Catalanotti1, C. Cattaneo7, S. Z. Chen5, T. L. Chen12, Y. Chen5, P. Creti4, S. W. Cui13, B. Z. Dai14, G. D’Al´ı Staiti15, 16, Danzengluobu12, M. Dattoli17, 18, 19, I. De Mitri3, B. D’Ettorre Piazzoli1, T. Di Girolamo1, X. H. Ding12, G. Di Sciascio11, C. F. Feng20, Zhaoyang Feng5, Zhenyong Feng21, F. Galeazzi8, E. Giroletti6, Q. B. Gou5, Y. Q. Guo5, H. H. He5, Haibing Hu12, Hongbo Hu5, Q. Huang21, M. Iacovacci1, R. Iuppa10, I. James8, H. Y. Jia21, Labaciren12, H. J. Li12, J. Y. Li20, X. X. Li5, G. Liguori6, C. Liu5, C. Q. Liu14, J. Liu14, M. Y. Liu12, H. Lu5, L. L. Ma5, X. H. Ma5, G. Mancarella3, 8, 22, G. Marsella3, D. Martello3, S. Mastroianni2, P. Montini8, C. C. Ning12, A. Pagliaro16, M. Panareo3, B. Panico10, L. Perrone3, P. Pistilli8, F. Ruggieri8, P. Salvini7, R. Santonico10, P. R. Shen5, X. D. Sheng5, F. Shi5, C. Stanescu8, A. Surdo4, Y. H. Tan5, P. Vallania17, S. Vernetto17, C. Vigorito18, B. Wang5, H. Wang5, C. Y. Wu5, H. R. Wu5, B. Xu21, L. Xue20, Q. Y. Yang14, X. C. Yang14, Z. G. Yao5, A. F. Yuan12, M. Zha5, H. M. Zhang5, Jilong Zhang5, Jianli Zhang5, L. Zhang14, P. Zhang14, X. Y. Zhang20, Y. Zhang5, J. Zhao5, Zhaxiciren12, Zhaxisangzhu12, X. X. Zhou21, F. R. Zhu21, Q. Q. Zhu5, G. Zizzi91 Dipartimento di Fisica dell’Universita` di Napoli 'Federico II, ' Complesso Universitario di Monte Sant’Angelo, via Cinthia, I. 80126 Napoli, Italy2 Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Complesso Universitario di Monte Sant’Angelo, Italy3 Dipartimento di Matematica e. Fisica '.E. De Giorgi' dell’Universita` del Salento, via per Arnesano, I. 73100 Lecce, Italy4 Istituto Nazionale di Fisica Nucleare, Sezione di Lecce, Italy5 Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, P. O. Box 918, 100049 Beijing, China, c.h.e.n.s.z.@.i.h.e.p. a.c. cn6 Dipartimento di Fisica Nucleare e. Teorica dell’Universita` di Pavia, via Bassi 6, I. 27100 Pavia, Italy7 Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, Italy8 Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tre, via della Vasca Navale 84, I. 00146 Roma, Italy9 Istituto Nazionale di Fisica Nucleare–CNAF, Viale Berti Pichat 6/2, I. 40127 Bologna, Italy10 Dipartimento di Fisica dell’Universita` di Roma 'Tor Vergata, ' via della Ricerca Scientifica 1, I. 00133 Roma, Italy11 Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tor Vergata, via della Ricerca Scientifica 1, Italy12 Tibet University, 850000 Lhasa, Xizang, China13 Hebei Normal University, Shijiazhuang 050016, Hebei, China14 Yunnan University, 2 North Cuihu R.d., 650091 Kunming, Yunnan, China15 Dipartimento di Fisica e. Tecnologie Relative, Universita` degli Studi di Palermo, Viale delle Scienze, Edificio 18, I. 90128 Palermo, Italy16 Istituto Nazionale di Fisica Nucleare, Sezione di Catania, Viale A. Doria 6, I. 95125 Catania, Italy17 Osservatorio Astrofisico di Torino, Istituto Nazionale di Astrofisica, corso Fiume 4, I. 10133 Torino, Italy18 Istituto Nazionale di Fisica Nucleare, Sezione di Torino, via P. Giuria 1, I. 10125 Torino, Italy19 Dipartimento di Fisica Generale dell’Universita` di Torino, Italy20 Shandong University, 250100 Jinan, Shandong, China21 Southwest Jiaotong University, 610031 Chengdu, Sichuan, China22 Dipartimento di Fisica dell’Universita` 'Roma Tre, ' via della Vasca Navale 84, Italy23 Istituto di Astrofisica Spaziale e. Fisica Cosmica dell’Istituto Nazionale di Astrofisica, via La Malfa 153, I. 90146 Palermo, ItalyReceived 2012 March 8, accepted 2012 July 27, published 2012 September 18, MARI, Stefano Maria, B. Bartoli, BERNARDINI, Paolo, X. J. Bi, C. Bleve, I. Bolognino, P. Branchini, A. Budano, A. K. Calabrese Melcarne, P. Camarri, Z. Cao, R. Cardarelli, S. Catalanotti, C. Cattaneo, S. Z. Chen, T. L. Chen, Y. Chen, P. Creti, S. W. Cui, B. Z. Dai, G. D’Al´ı Staiti, Danzengluobu, M. Dattoli, DE MITRI, Ivan, B. D’Ettorre Piazzoli, T. Di Girolamo, X. H. Ding, G. Di Sciascio, C. F. Feng, Zhaoyang Feng, Zhenyong Feng, F. Galeazzi, E. Giroletti, Q. B. Gou, Y. Q. Guo, H. H. He, Haibing Hu, Hongbo Hu, Q. Huang, M. Iacovacci, R. Iuppa, I. Jame, H. Y. Jia, Labaciren, H. J. Li, J. Y. Li, X. X. Li, G. Liguori, C. Liu, C. Q. Liu, J. Liu, M. Y. Liu, H. Lu, L. L. Ma, X. H. Ma, MANCARELLA, Giovanni, S. M. Mari, MARSELLA, GIOVANNI, MARTELLO, Daniele, S. Mastroianni, P. Montini, C. C. Ning, A. Pagliaro, PANAREO, Marco, B. Panico, PERRONE, Lorenzo, P. Pistilli, F. Ruggieri, P. Salvini, R. Santonico, P. R. Shen, X. D. Sheng, F. Shi, C. Stanescu, A. Surdo, Y. H. Tan, P. Vallania, S. Vernetto, C. Vigorito, B. Wang, H. Wang, C. Y. Wu, H. R. Wu, B. Xu, L. Xue, Q. Y. Yang, X. C. Yang, Z. G. Yao, A. F. Yuan, M. Zha, H. M. Zhang, Jilong Zhang, Jianli Zhang, L. Zhang, P. Zhang, X. Y. Zhang, Y. Zhang, J. Zhao, Zhaxiciren, Zhaxisangzhu, X. X. Zhou, F. R. Zhu, Q. Q. Zhu, G. Zizzi, Bartoli, Bruno, Bernardini, P., X. J., Bi, Bleve, C., Bolognino, I., Branchini, P., Budano, A., Calabrese Melcarne, A. K., Camarri, P., Cao, Z., Cardarelli, R., Catalanotti, Sergio, Cattaneo, C., Chen, S. Z., Chen, T. L., Chen, Y., Creti, P., Cui, S. W., Dai, B. Z., D'Al? Staiti, G., Dattoli, M., De Mitri, I., D'ETTORRE PIAZZOLI, Benedetto, DI GIROLAMO, Tristano, Ding, X. H., Di Sciascio, G., Feng, C. F., Zhaoyang, Feng, Zhenyong, Feng, Galeazzi, F., Giroletti, E., Gou, Q. B., Guo, Y. Q., H. H., He, Haibing, Hu, Hongbo, Hu, Huang, Q., Iacovacci, Michele, Iuppa, R., James, I., Jia, H. Y., H. J., Li, J. Y., Li, X. X., Li, Liguori, G., Liu, C., Liu, C. Q., Liu, J., Liu, M. Y., Lu, H., L. L., Ma, X. H., Ma, Mancarella, G., Mari, S. M., Marsella, G., Martello, D., Mastroianni, S., Montini, P., Ning, C. C., Pagliaro, A., Panareo, M., Panico, B., Perrone, L., Pistilli, P., Ruggieri, F., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Stanescu, C., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, B., Wang, H., C. Y., Wu, H. R., Wu, Xu, B., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Jilong, Zhang, Jianli, Zhang, Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhao, J., Zhou, X. X., Zhu, F. R., Zhu, Q. Q., Zizzi, and G., B., Bartoli, Bernardini, Paolo, C., Bleve, I., Bolognino, P., Branchini, A., Budano, A. K., Calabrese Melcarne, P., Camarri, Z., Cao, R., Cardarelli, S., Catalanotti, C., Cattaneo, S. Z., Chen, T. L., Chen, Y., Chen, P., Creti, S. W., Cui, B. Z., Dai, G., D’Al´ı Staiti, M., Dattoli, B., D’Ettorre Piazzoli, T., Di Girolamo, X. H., Ding, G., Di Sciascio, C. F., Feng, F., Galeazzi, E., Giroletti, Q. B., Gou, Y. Q., Guo, Q., Huang, M., Iacovacci, R., Iuppa, I., Jame, H. Y., Jia, G., Liguori, C., Liu, C. Q., Liu, J., Liu, M. Y., Liu, H., Lu, Mancarella, Giovanni, S. M., Mari, Marsella, Giovanni, Martello, Daniele, S., Mastroianni, P., Montini, C. C., Ning, A., Pagliaro, Panareo, Marco, B., Panico, Perrone, Lorenzo, P., Pistilli, F., Ruggieri, P., Salvini, R., Santonico, P. R., Shen, X. D., Sheng, F., Shi, C., Stanescu, A., Surdo, Y. H., Tan, P., Vallania, S., Vernetto, C., Vigorito, B., Wang, H., Wang, B., Xu, L., Xue, Q. Y., Yang, X. C., Yang, Z. G., Yao, A. F., Yuan, M., Zha, H. M., Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhang, J., Zhao, X. X., Zhou, F. R., Zhu, Q. Q., Zhu, G., Zizzi, B., Bartoli1, P., Bernardini3, X. J., Bi5, C., Bleve3, I., Bolognino6, P., Branchini8, A., Budano8, A. K., Calabrese Melcarne9, P., Camarri10, Z., Cao5, R., Cardarelli11, S., Catalanotti1, C., Cattaneo7, S. Z., Chen5, T. L., Chen12, Y., Chen5, P., Creti4, S. W., Cui13, B. Z., Dai14, G., D’Al´ı Staiti15, 16, Danzengluobu12, M., Dattoli17, 18, 19, I., De Mitri3, B., D’Ettorre Piazzoli1, T., Di Girolamo1, X. H., Ding12, G., Di Sciascio11, C. F., Feng20, Zhaoyang, Feng5, Zhenyong, Feng21, F., Galeazzi8, E., Giroletti6, Q. B., Gou5, Y. Q., Guo5, H. H., He5, Haibing, Hu12, Hongbo, Hu5, Q., Huang21, M., Iacovacci1, R., Iuppa10, I., James8, H. Y., Jia21, Labaciren12, H. J., Li12, J. Y., Li20, X. X., Li5, G., Liguori6, C., Liu5, C. Q., Liu14, J., Liu14, M. Y., Liu12, H., Lu5, L. L., Ma5, X. H., Ma5, G., Mancarella3, Mari, Stefano Maria, 8, 22, G., Marsella3, D., Martello3, S., Mastroianni2, Montini8, P., C. C., Ning12, A., Pagliaro16, M., Panareo3, B., Panico10, L., Perrone3, P., Pistilli8, Ruggieri8, F., P., Salvini7, R., Santonico10, P. R., Shen5, X. D., Sheng5, F., Shi5, C., Stanescu8, A., Surdo4, Y. H., Tan5, P., Vallania17, S., Vernetto17, C., Vigorito18, B., Wang5, H., Wang5, C. Y., Wu5, H. R., Wu5, B., Xu21, L., Xue20, Q. Y., Yang14, X. C., Yang14, Z. G., Yao5, A. F., Yuan12, M., Zha5, H. M., Zhang5, Jilong, Zhang5, Jianli, Zhang5, L., Zhang14, P., Zhang14, X. Y., Zhang20, Y., Zhang5, J., Zhao5, Zhaxiciren12, Zhaxisangzhu12, X. X., Zhou21, F. R., Zhu21, Q. Q., Zhu5, G., Zizzi91 Dipartimento di Fisica dell’Universita` di Napoli 'Federico II, ' Complesso Universitario di Monte, Sant’Angelo, Via, Cinthia, I., 80126 Napoli, Italy2 Istituto Nazionale di Fisica, Nucleare, Sezione di, Napoli, Complesso Universitario di Monte, Sant’Angelo, De Giorgi' dell’Universita` del Salento, Italy3 Dipartimento di Matematica e. Fisica '. E., via per, Arnesano, I., 73100 Lecce, Italy4 Istituto Nazionale di Fisica, Nucleare, Sezione di, Lecce, Italy5 Key Laboratory of Particle, Astrophysic, Institute of High Energy, Physic, Chinese Academy of, Science, P. O., Box 918, 100049, Beijing, China, Teorica dell’Universita` di Pavia, c. h. e. n. s. z. @. i. h. e. p. a. c. cn6 Dipartimento di Fisica Nucleare e., via Bassi, 6, I., 27100 Pavia, Italy7 Istituto Nazionale di Fisica, Nucleare, Sezione di, Pavia, Italy8 Istituto Nazionale di Fisica, Nucleare, Sezione di Roma, Tre, via della Vasca Navale, 84, I., 00146 Roma, Italy9 Istituto Nazionale di Fisica, Nucleare–cnaf, Viale Berti Pichat, 6/2, I., 40127 Bologna, Italy10 Dipartimento di Fisica dell’Universita` di Roma 'Tor, Vergata, ' via della Ricerca Scientifica, 1, I., 00133 Roma, Italy11 Istituto Nazionale di Fisica, Nucleare, Sezione di Roma Tor, Vergata, via della Ricerca Scientifica, 1, Italy12 Tibet, University, 850000, Lhasa, Xizang, China13 Hebei Normal, University, Shijiazhuang, 050016, Hebei, China14 Yunnan, University, 2 North Cuihu, R. d., 650091, Kunming, Yunnan, China15 Dipartimento di Fisica e., Tecnologie Relative, Universita` degli Studi di, Palermo, Viale delle, Scienze, Edificio, 18, I., 90128 Palermo, Italy16 Istituto Nazionale di Fisica, Nucleare, Sezione di, Catania, Viale A., Doria 6, I., 95125 Catania, Italy17 Osservatorio Astrofisico di, Torino, Istituto Nazionale di, Astrofisica, corso Fiume, 4, I., 10133 Torino, Italy18 Istituto Nazionale di Fisica, Nucleare, Sezione di, Torino, via P., Giuria 1, I., 10125 Torino, Italy19 Dipartimento di Fisica Generale dell’Universita` di, Torino, Italy20 Shandong, University, 250100, Jinan, Shandong, China21 Southwest Jiaotong, University, 610031, Chengdu, Sichuan, China22 Dipartimento di Fisica dell’Universita` 'Roma, Tre, ' via della Vasca Navale, 84, Italy23 Istituto di Astrofisica Spaziale e., Fisica Cosmica dell’Istituto Nazionale di Astrofisica, via La Malfa, 153, I., 90146 Palermo, ItalyReceived 2012 March, 8, accepted 2012 July, 27, and published 2012 September, 18
Subjects: Active galactic nucleus, active" ["galaxies], Astrophysics::High Energy Astrophysical Phenomena, Flux, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 7. Clean energy, 01 natural sciences, Spectral line, law.invention, law, 0103 physical sciences, Blazar, 010303 astronomy & astrophysics, Physics, individual (Markarian 501) – galaxies: active – gamma rays: general – radiation mechanisms: non-thermal [BL Lacertae objects], " "general" ["gamma rays], 010308 nuclear & particles physics, BL Lacertae objects: individual (Markarian 501) – galaxies: active – gamma rays: general – radiation mechanisms: non-thermal, Settore FIS/01 - Fisica Sperimentale, Astronomy and Astrophysics, Quasar, Galaxy, individual (Markarian 501)" ["BL Lacertae objects], 13. Climate action, Space and Planetary Science, Spectral energy distribution, Flare
Abstract: "As one of the brightest active blazars in both X-ray and very high energy γ -ray bands, Mrk 501, is very useful for" "physics associated with jets from active galactic nuclei. The ARGO-YBJ experiment has monitored Mrk 501 for γ - rays above 0.3 TeV since 2007 November. The largest flare since 2005 was observed from 2011 October and lasted until about 2012 April. In this paper, a detailed analysis of this event is reported. During the brightest γ -ray flaring episodes from 2011 October 17 to November 22, an excess of the event rate over 6σ is detected by ARGO-YBJ in the direction of Mrk 501, corresponding to an increase of the γ -ray flux above 1 TeV by a factor of 6.6 ± 2.2 from its steady emission. In particular, the γ -ray flux above 8 TeV is detected with a significance better than 4σ . Based on time-dependent synchrotron self-Compton (SSC) processes, the broadband energy spectrum is interpreted as the emission from an electron energy distribution parameterized with a single power-law function with an exponential cutoff at its high-energy end. The average spectral energy distribution for the steady emission is well described by this simple one-zone SSC model. However, the detection of γ -rays above 8 TeV during the flare challenges this model due to the hardness of the spectra. Correlations between X-rays and γ -rays are also investigated."
Published: 2012

17. Highlights from the ARGO-YBJ Experiment

Author: L. Perrone, Carlo Vigorito, X. C. Yang, A. Cappa, Zihuang Cao, Haibing Hu, R. Santonico, H. H. He, C. Liu, Irina James, P. Salvini, C. Bleve, Y. Zhang, X. H. Ma, D. Martello, G. Aielli, Bingwei Xu, X. Y. Zhang, X. X. Li, Severino Angelo Maria Bussino, Q. B. Gou, B. S. Wang, Zhaxisangzhu, Jilong Zhang, A. Pagliaro, Y. X. Yan, F. Shi, M. Iacovacci, M. Zha, M. Dattoli, B. D'Ettorre Piazzoli, Y. Q. Guo, X. D. Sheng, P. R. Shen, H. J. Li, H. R. Wu, P. Pistilli, X. X. Zhou, Piero Vallania, Paolo Bernardini, C. Cattaneo, P. Galeotti, G. Marsella, X. R. Meng, L. Xue, P. Camarri, X. B. Qu, J. K. K. Liu, Q. Huang, Hongbo Hu, Hong-peng Lu, G. Mancarella, C. Stanescu, Chang-Chun Ning, X. H. Ding, A. Surdo, C. F. Feng, Zhaoyang Feng, F. Galeazzi, Y. H. Tan, P. Creti, Zhenyong Feng, Jianli Zhang, M. Y. Liu, B. Liberti, I. De Mitri, T. Di Girolamo, N. Cheng, P. Celio, Q. Q. Zhu, T. L. Chen, H. M. Zhang, S. W. Cui, S. M. Mari, B. Z. Dai, F. Ruggieri, C. Y. Wu, P. Branchini, F. R. Zhu, L. Saggese, M. Panareo, Q. Y. Yang, G. Zizzi, G. D'Alí Staiti, S. Catalanotti, L. Zhang, J. Y. Li, E. Rossi, P. F. Zhang, Y. B. Chen, Paolo Montini, X. J. Bi, R. Iuppa, S. Vernetto, H. W. Wang, S. Z. Chen, A. Budano, A. K. Calabrese Melcarne, S. Mastroianni, R. Cardarelli, B. Bartoli, R. Gargana, Labaciren, A. F. Yuan, G. Di Sciascio, M. De Vincenzi, Danzengluobu, G. Liguori, C. X. Liu, H. Y. Jia, C. Bacci, Aielli, G, Bacci, C, Bartoli, B, Bernardini, P, Bi, XJ, Bleve, C, Branchini, P, Budano, A, Bussino, S, Calabrese Melcarne, AK, Camarri, P, Cao, Z, Cappa, A, Cardarelli, R, Catalanotti, S, Cattaneo, C, Celio, P, Chen, SZ, Chen, TL, Chen, Y, Cheng, N, Creti, P, Cui, SW, Dai, BZ, D’AlìStaiti, G, Danzengluobu, Dattoli, M, De Mitri, I, D’Ettorre Piazzoli, B, De Vincenzi, M, Di Girolamo, T, Ding, XH, Di Sciascio, G, Feng, CF, Feng, ZYa, Feng, ZYo, Galeazzi, F, Galeotti, P, Gargana, R, Gou, QB, Guo, YQ, He, HH, Hu, HBi, Hu, HBo, Huang, Q, Iacovacci, M, Iuppa, R, James, J, Jia, HY, Labaciren, Li, HJ, Li, JY, Li, XX, Liberti, B, Liguori, G, Liu, C, Liu, CQ, Liu, MY, Liu, J, Lu, H, Ma, XH, Mancarella, G, Mari, SM, Marsella, G, Martello, D, Mastroianni, S, Meng, XR, Montini, P, Ning, CC, Pagliaro, A, Panareo, M, Perrone, L, Pistilli, P, Qu, XB, Rossi, E, Ruggieri, F, Saggese, L, Salvini, P, Santonico, R, Shen PR, Sheng, XD, Shi, F, Stanescu, C, Surdo, A, Tan, YH, Vallania, P, Vernetto, S, Vigorito, C, Wang, B, Wang, H, Wu, CY, Wu, HR, Xu, B, Xue, L, Yan, YX, Yang, QY, Yang, XC, Yuan, AF, Zha, M, Zhang, HM, Zhang, JLi, Zhang, JLo, Zhang, L, Zhang, P, Zhang, XY, Zhang, Y, Zhaxisangzhu, Zhou, XX, Zhu, FR, Zhu, QQ, Zizzi, G, G., Aielli, C., Bacci, B., Bartoli, Bernardini, Paolo, X. J., Bi, C., Bleve, P., Branchini, A., Budano, S., Bussino, A. K., CALABRESE MELCARNE, P., Camarri, Z., Cao, A., Cappa, R., Cardarelli, S., Catalanotti, C., Cattaneo, P., Celio, S. Z., Chen, Y., Chen, N., Cheng, P., Creti, S. W., Cui, B. Z., Dai, G., D’ALÍ STAITI, M., Dattoli, DE MITRI, Ivan, B., D’ETTORRE PIAZZOLI, M., DE VINCENZI, T., DI GIROLAMO, X. H., Ding, G., DI SCIASCIO, C. F., Feng, Zhaoyang, Feng, Zhenyong, Feng, F., Galeazzi, P., Galeotti, R., Gargana, Q. B., Gou, Y. Q., Guo, H. H., He, Haibing, Hu, Hongbo, Hu, Q., Huang, M., Iacovacci, R., Iuppa, I., Jame, H. Y., Jia, H. J., Li, J. Y., Li, X. X., Li, B., Liberti, G., Liguori, C., Liu, C. Q., Liu, M. Y., Liu, J., Liu, H., Lu, X. H., Ma, Mancarella, Giovanni, S. M., Mari, Marsella, Giovanni, Martello, Daniele, S., Mastroianni, X. R., Meng, P., Montini, C. C., Ning, A., Pagliaro, Panareo, Marco, Perrone, Lorenzo, P., Pistilli, X. B., Qu, E., Rossi, F., Ruggieri, L., Saggese, P., Salvini, R., Santonico, P. R., Shen, X. D., Sheng, F., Shi, C., Stanescu, A., Surdo, Y. H., Tan, P., Vallania, S., Vernetto, C., Vigorito, B., Wang, H., Wang, C. Y., Wu, H. R., Wu, B., Xu, L., Xue, Y. X., Yan, Q. Y., Yang, X. C., Yang, A. F., Yuan, M., Zha, H. M., Zhang, Jilong, Zhang, Jianli, Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhang, X. X., Zhou, F. R., Zhu, Q. Q., Zhu, G., Zizzi, Bi, Xj, Bussino, Severino Angelo Maria, Calabrese Melcarne, Ak, Chen, Sz, Chen, Tl, Cui, Sw, Dai, Bz, D'Ali Staiti, G, D'Ettorre Piazzoli, B, DE VINCENZI, Mario, Ding, Xh, Feng, Cf, Feng Zhao, Yang, Feng Zhen, Yong, Gou, Qb, Guo, Yq, He, Hh, Hu, Haibing, Hu Hong, Bo, James, I, Jia, Hy, Li, Hj, Li, Jy, Li, Xx, Liu, Cq, Liu, My, Ma, Xh, Mari, Stefano Maria, Meng, Xr, Ning, Cc, Qu, Xb, Shen, Pr, Sheng, Xd, Tan, Yh, Wu, Cy, Wu, Hr, Yan, Yx, Yang, Qy, Yang, Xc, Yuan, Af, Zhang, Hm, Zhang Ji, Long, Zhang Jian, Li, Zhang, Xy, Zhou, Xx, Zhu, Fr, Zhu, Qq, Zizzi, G., Feng, Zhao-Yang, Feng, Zhen-Yong, Hu, Hong-Bo, Mari, Sm, Zhang, Ji-Long, Zhang, Jian-Li, A. K., Calabrese Melcarne, T. L., Chen, G., D’Alı´ Staiti, B., D’Ettorre Piazzoli, M., De Vincenzi, T., Di Girolamo, G., Di Sciascio, L., Xu, Aielli, G., Bacci, C., Bartoli, Bruno, Bernardini, P., Bleve, C., Branchini, P., Budano, A., Bussino, S., Calabrese Melcarne, A. K., Camarri, P., Cao, Z., Cappa, A., Cardarelli, R., Catalanotti, Sergio, Cattaneo, C., Celio, P., Chen, S. Z., Chen, T. L., Chen, Y., Cheng, N., Creti, P., Cui, S. W., Dai, B. Z., D’Alí Staiti, G., Dattoli, M., De Mitri, I., D'ETTORRE PIAZZOLI, Benedetto, De Vincenzi, M., DI GIROLAMO, Tristano, Ding, X. H., Di Sciascio, G., Feng, C. F., Galeazzi, F., Galeotti, P., Gargana, R., Gou, Q. B., Guo, Y. Q., Huang, Q., Iacovacci, Michele, Iuppa, R., James, I., Jia, H. Y., Liberti, B., Liguori, G., Liu, C., Liu, C. Q., Liu, M. Y., Liu, J., Lu, H., Mancarella, G., Mari, S. M., Marsella, G., Martello, D., Mastroianni, S., Meng, X. R., Montini, P., Ning, C. C., Pagliaro, A., Panareo, M., Perrone, L., Pistilli, P., Rossi, E., Ruggieri, F., Saggese, L., Salvini, P., Santonico, R., Shen, P. R., Sheng, X. D., Shi, F., Stanescu, C., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, B., Wang, H., Xu, B., Xue, L., Yan, Y. X., Yang, Q. Y., Yang, X. C., Yuan, A. F., Zha, M., Zhang, H. M., Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhou, X. X., Zhu, F. R., and Zhu, Q. Q.
Subjects: History, Astronomy, Flux, Astrophysics, Proton flux, 01 natural sciences, Argo-Ybj, Gamma-ray emission, Settore FIS/05 - Astronomia E Astrofisica, Cosmic-ray physics, Resistive Plate Chambers, Instrumentation, 010303 astronomy & astrophysics, Argo, Physics, Range (particle radiation), Detector, Settore FIS/01 - Fisica Sperimentale, Crab nebula, Astrophysics::Instrumentation and Methods for Astrophysics, Gamma ray, Crab nebula, Extensive air showers, Flux ratio, Gamma-ray astronomy, Gamma-ray emission, Ground based, Resistive plate chambers, Astronomy, Cosmic rays, Cosmology, Experiments, Gamma rays, Flux ratio, Cosmology, Computer Science Applications, Resistive plate chambers, Nuclear and High Energy Physics, X- and γ-ray instrument, Ground-based gamma-ray astronomy, Astrophysics::High Energy Astrophysical Phenomena, Extensive air shower, Cosmic ray, Astrophysics::Cosmology and Extragalactic Astrophysics, Cosmic Ray, Education, Resistive Plate Chambers, Extensive air showers, Ground-based g ray astronomy, Cosmic-ray physics, Ground-based γ-ray astronomy, 0103 physical sciences, Extensive air showers, Cosmic rays, Extensive air showers, X- and γ-ray instruments, Pulsars. Quasars, active or peculiar galaxies, objects and systems, Astrophysics::Galaxy Astrophysics, Gamma-ray astronomy, 010308 nuclear & particles physics, Resistive Plate Chamber, Ground based, Crab Nebula, Antiproton, Satellite, Gamma-ray burst, Experiments
Abstract: ""The ARGO-YBJ experiment at YangBaJing in Tibet (4300m a.s.l.) has been taking data with its full layout since October 2007. Here we present a few significant results obtained in gamma-ray astronomy and cosmic-ray physics. Emphasis is placed on the analysis of gamma-ray emission from point-like sources (Crab Nebula, MRK 421), on the preliminary limit on the antiproton\\\/proton flux ratio, on the large-scale cosmic-ray anisotropy and on the proton-air cross-section. The performance of the detector is also discussed, and the perspectives of the experiment are outlined.""
Published: 2012
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18. Observation of TeV gamma-rays from the unidentified source HESS J1841-055 with the ARGO-YBJ experiment

Author: B. Bartoli1, 2, P. Bernardini3, 4, X. J. Bi5, I. Bolognino6, 7, P. Branchini8, A. Budano8, A. K. Calabrese Melcarne9, P. Camarri10, Z. Cao5, R. Cardarelli11, S. Catalanotti1, C. Cattaneo7, S. Z. Chen5, T. L. Chen12, Y. Chen5, P. Creti4, S. W. Cui13, B. Z. Dai14, G. D’Al´ı Staiti15, A. D’Amone3, 4, Danzengluobu12, I. De Mitri3, B. D’Ettorre Piazzoli1, T. Di Girolamo1, X. H. Ding12, G. Di Sciascio11, C. F. Feng17, Zhaoyang Feng5, Zhenyong Feng18, F. Galeazzi8, E. Giroletti6, Q. B. Gou5, Y. Q. Guo5, H. H. He5, Haibing Hu12, Hongbo Hu5, Q. Huang18, M. Iacovacci1, R. Iuppa10, I. James8, H. Y. Jia18, Labaciren12, H. J. Li12, J. Y. Li17, X. X. Li5, G. Liguori6, C. Liu5, C. Q. Liu14, J. Liu14, M. Y. Liu12, H. Lu5, L. L. Ma5, X. H. Ma5, G. Mancarella3, 8, 19, G. Marsella3, D. Martello3, S. Mastroianni2, P. Montini8, C. C. Ning12, A. Pagliaro16, M. Panareo3, B. Panico10, L. Perrone3, P. Pistilli8, F. Ruggieri8, P. Salvini7, R. Santonico10, S. N. Sbano3, P. R. Shen5, X. D. Sheng5, F. Shi5, A. Surdo4, Y. H. Tan5, P. Vallania21, S. Vernetto21, C. Vigorito22, B. Wang5, H. Wang5, C. Y. Wu5, H. R. Wu5, B. Xu18, L. Xue17, Q. Y. Yang14, X. C. Yang14, Z. G. Yao5, A. F. Yuan12, M. Zha5, H. M. Zhang5, Jilong Zhang5, Jianli Zhang5, L. Zhang14, P. Zhang14, X. Y. Zhang17, Y. Zhang5, J. Zhao5, Zhaxiciren12, Zhaxisangzhu12, X. X. Zhou18, F. R. Zhu18, Q. Q. Zhu5, G. Zizzi9 1 Dipartimento di Fisica dell’Universit`a di Napoli 'Federico II, ' Complesso Universitario di Monte Sant’Angelo, via Cinthia, I. 80126 Napoli, Italy 2 Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Complesso Universitario di Monte Sant’Angelo, Italy 3 Dipartimento Matematica e. Fisica 'Ennio De Giorgi, ' Universit`a del Salento, via per Arnesano, I. 73100 Lecce, Italy 4 Istituto Nazionale di Fisica Nucleare, Sezione di Lecce, Italy 5 Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, P. O. Box 918, 100049 Beijing, China, c.h.e.n.s.z.@.i.h.e.p. a.c. cn 6 Dipartimento di Fisica dell’Universit`a di Pavia, via Bassi 6, I. 27100 Pavia, Italy 7 Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, Italy 8 Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tre, via della Vasca Navale 84, I. 00146 Roma, Italy 9 Istituto Nazionale di Fisica Nucleare CNAF, Viale Berti Pichat 6/2, I. 40127 Bologna, Italy 10 Dipartimento di Fisica dell’Universit`a di Roma 'Tor Vergata, ' via della Ricerca Scientifica 1, I. 00133 Roma, Italy 11 Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tor Vergata, via della Ricerca Scientifica 1, Italy 12 Tibet University, 850000 Lhasa, Xizang, China 13 Hebei Normal University, Shijiazhuang 050016, Hebei, China 14 Yunnan University, 2 North Cuihu Road, 650091 Kunming, Yunnan, China 15 Dipartimento di Fisica, Universit`a degli Studi di Palermo, Viale delle Scienze, Edificio 18, I. 90128 Palermo, Italy 16 Istituto Nazionale di Fisica Nucleare, Sezione di Catania, Viale A. Doria 6, I. 95125 Catania, Italy 17 Shandong University, 250100 Jinan, Shandong, China 18 Southwest Jiaotong University, 610031 Chengdu, Sichuan, China 19 Dipartimento di Fisica dell’Universit`a 'Roma Tre, ' via della Vasca Navale 84, Italy 20 Istituto di Astrofisica Spaziale e. Fisica Cosmica dell’Istituto Nazionale di Astrofisica, via La Malfa 153, I. 90146 Palermo, Italy 21 Osservatorio Astrofisico di Torino dell’Istituto Nazionale di Astrofisica, corso Fiume 4, I. 10133 Torino, Italy 22 Istituto Nazionale di Fisica Nucleare, Sezione di Torino, via P. Giuria 1, I. 10125 Torino, Italy 23 Dipartimento di Fisica dell’Universit`a di Torino, Italy, MARI, Stefano Maria, Bartoli, Bruno, Bernardini, P., X. J., Bi, Bolognino, I., Branchini, P., Budano, A., Calabrese Melcarne, A. K., Camarri, P., Cao, Z., Cardarelli, R., Catalanotti, Sergio, Cattaneo, C., Chen, S. Z., Chen, T. L., Chen, Y., Creti, P., Cui, S. W., Dai, B. Z., D'Al? Staiti, G., D'Amone, A., Danzengluobu, De Mitri, I., D'ETTORRE PIAZZOLI, Benedetto, DI GIROLAMO, Tristano, Ding, X. H., Di Sciascio, G., Feng, C. F., Zhaoyang, Feng, Zhenyong, Feng, Galeazzi, F., Giroletti, E., Gou, Q. B., Guo, Y. Q., H. H., He, Haibing, Hu, Hongbo, Hu, Huang, Q., Iacovacci, Michele, Iuppa, R., James, I., Jia, H. Y., Labaciren, H. J., Li, J. Y., Li, X. X., Li, Liguori, G., Liu, C., Liu, C. Q., Liu, J., Liu, M. Y., Lu, H., L. L., Ma, X. H., Ma, Mancarella, G., Mari, S. M., Marsella, G., Martello, D., Mastroianni, S., Montini, P., Ning, C. C., Pagliaro, A., Panareo, M., Panico, B., Perrone, L., Pistilli, P., Ruggieri, F., Salvini, P., Santonico, R., Sbano, S. N., Shen, P. R., Sheng, X. D., Shi, F., Surdo, A., Tan, Y. H., Vallania, P., Vernetto, S., Vigorito, C., Wang, B., Wang, H., C. Y., Wu, H. R., Wu, Xu, B., Xue, L., Yang, Q. Y., Yang, X. C., Yao, Z. G., Yuan, A. F., Zha, M., Zhang, H. M., Jilong, Zhang, Jianli, Zhang, Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhao, J., Zhaxiciren, Zhaxisangzhu, Zhou, X. X., Zhu, F. R., Zhu, Q. Q., Zizzi, G., B., Bartoli1, P., Bernardini3, X. J., Bi5, I., Bolognino6, P., Branchini8, A., Budano8, A. K., Calabrese Melcarne9, P., Camarri10, Z., Cao5, R., Cardarelli11, S., Catalanotti1, C., Cattaneo7, S. Z., Chen5, T. L., Chen12, Y., Chen5, P., Creti4, S. W., Cui13, B. Z., Dai14, G., D’Al´ı Staiti15, A., D’Amone3, 4, Danzengluobu12, I., De Mitri3, B., D’Ettorre Piazzoli1, T., Di Girolamo1, X. H., Ding12, G., Di Sciascio11, C. F., Feng17, Zhaoyang, Feng5, Zhenyong, Feng18, F., Galeazzi8, E., Giroletti6, Q. B., Gou5, Y. Q., Guo5, H. H., He5, Haibing, Hu12, Hongbo, Hu5, Q., Huang18, M., Iacovacci1, R., Iuppa10, I., James8, H. Y., Jia18, Labaciren12, H. J., Li12, J. Y., Li17, X. X., Li5, G., Liguori6, C., Liu5, C. Q., Liu14, J., Liu14, M. Y., Liu12, H., Lu5, L. L., Ma5, X. H., Ma5, G., Mancarella3, Mari, Stefano Maria, 8, 19, G., Marsella3, D., Martello3, S., Mastroianni2, Montini8, P., C. C., Ning12, A., Pagliaro16, M., Panareo3, B., Panico10, L., Perrone3, P., Pistilli8, Ruggieri8, F., P., Salvini7, R., Santonico10, S. N., Sbano3, P. R., Shen5, X. D., Sheng5, F., Shi5, A., Surdo4, Y. H., Tan5, P., Vallania21, S., Vernetto21, C., Vigorito22, B., Wang5, H., Wang5, C. Y., Wu5, H. R., Wu5, B., Xu18, L., Xue17, Q. Y., Yang14, X. C., Yang14, Z. G., Yao5, A. F., Yuan12, M., Zha5, H. M., Zhang5, Jilong, Zhang5, Jianli, Zhang5, L., Zhang14, P., Zhang14, X. Y., Zhang17, Y., Zhang5, J., Zhao5, Zhaxiciren12, Zhaxisangzhu12, X. X., Zhou18, F. R., Zhu18, Q. Q., Zhu5, G., Zizzi9 1 Dipartimento di Fisica dell’Universit`a di Napoli 'Federico II, ' Complesso Universitario di Monte, Sant’Angelo, Via, Cinthia, I., 80126 Napoli, Italy, 2 Istituto Nazionale di Fisica Nucleare, Sezione di, Napoli, Complesso Universitario di Monte, Sant’Angelo, Italy 3 Dipartimento Matematica e., Fisica 'Ennio De Giorgi, ' Universit`a del, Salento, via per, Arnesano, I., 73100 Lecce, Italy, 4 Istituto Nazionale di Fisica Nucleare, Sezione di, Lecce, Italy, 5 Key Laboratory of Particle Astrophysic, Institute of High Energy, Physic, Chinese Academy of, Science, P. O., Box 918, 100049, Beijing, China, cn 6 Dipartimento di Fisica dell’Universit`a di Pavia, c. h. e. n. s. z. @. i. h. e. p. a. c., via Bassi, 6, I., 27100 Pavia, Italy, 7 Istituto Nazionale di Fisica Nucleare, Sezione di, Pavia, Italy, 8 Istituto Nazionale di Fisica Nucleare, Sezione di Roma, Tre, via della Vasca Navale, 84, I., 00146 Roma, Italy, 9 Istituto Nazionale di Fisica Nucleare CNAF, Viale Berti Pichat, 6/2, I., 40127 Bologna, Italy 10 Dipartimento di Fisica dell’Universit`a di Roma 'Tor, Vergata, ' via della Ricerca Scientifica, 1, I., 00133 Roma, Italy 11 Istituto Nazionale di Fisica, Nucleare, Sezione di Roma Tor, Vergata, via della Ricerca Scientifica, 1, Italy 12 Tibet, University, 850000, Lhasa, Xizang, China 13 Hebei Normal, University, Shijiazhuang, 050016, Hebei, China 14 Yunnan, University, 2 North Cuihu, Road, 650091, Kunming, Yunnan, China 15 Dipartimento di, Fisica, Universit`a degli Studi di, Palermo, Viale delle, Scienze, Edificio, 18, I., 90128 Palermo, Italy 16 Istituto Nazionale di Fisica, Nucleare, Sezione di, Catania, Viale A., Doria 6, I., 95125 Catania, Italy 17 Shandong, University, 250100, Jinan, Shandong, China 18 Southwest Jiaotong, University, 610031, Chengdu, Sichuan, China 19 Dipartimento di Fisica dell’Universit`a 'Roma, Tre, ' via della Vasca Navale, 84, Italy 20 Istituto di Astrofisica Spaziale e., Fisica Cosmica dell’Istituto Nazionale di Astrofisica, via La Malfa, 153, I., 90146 Palermo, Italy 21 Osservatorio Astrofisico di Torino dell’Istituto Nazionale di, Astrofisica, corso Fiume, 4, I., 10133 Torino, Italy 22 Istituto Nazionale di Fisica, Nucleare, Sezione di, Torino, via P., Giuria 1, I., 10125 Torino, Italy 23 Dipartimento di Fisica dell’Universit`a di, Torino, Italy, B., Bartoli, Bernardini, Paolo, I., Bolognino, P., Branchini, A., Budano, A. K., Calabrese Melcarne, P., Camarri, Z., Cao, R., Cardarelli, S., Catalanotti, C., Cattaneo, S. Z., Chen, T. L., Chen, Y., Chen, P., Creti, S. W., Cui, B. Z., Dai, G., D'Alí Staiti, D'Amone, Antonio, DE MITRI, Ivan, B., D'Ettorre Piazzoli, T., Di Girolamo, X. H., Ding, G., Di Sciascio, C. F., Feng, F., Galeazzi, E., Giroletti, Q. B., Gou, Y. Q., Guo, Q., Huang, M., Iacovacci, R., Iuppa, I., Jame, H. Y., Jia, G., Liguori, C., Liu, C. Q., Liu, J., Liu, M. Y., Liu, H., Lu, Mancarella, Giovanni, S. M., Mari, Marsella, Giovanni, Martello, Daniele, S., Mastroianni, P., Montini, C. C., Ning, A., Pagliaro, Panareo, Marco, B., Panico, Perrone, Lorenzo, P., Pistilli, F., Ruggieri, P., Salvini, R., Santonico, S. N., Sbano, P. R., Shen, X. D., Sheng, F., Shi, A., Surdo, Y. H., Tan, P., Vallania, S., Vernetto, C., Vigorito, B., Wang, H., Wang, B., Xu, L., Xue, Q. Y., Yang, X. C., Yang, Z. G., Yao, A. F., Yuan, M., Zha, H. M., Zhang, L., Zhang, P., Zhang, X. Y., Zhang, Y., Zhang, J., Zhao, X. X., Zhou, F. R., Zhu, Q. Q., Zhu, G., Zizzi, Bartoli, B, Bernardini, P, Bi, XJ, Bolognino, I, Branchini, P, Budano, A, Calabrese Melcarne, AK, Camarri, P, Cao, Z, Cardarelli, R, Catalanotti, S, Cattaneo, C, Chen, SZ, Chen, TL, Chen, Y, Creti, P, Cui, SW, Dai, BZ, D’Ali Staiti, G, D’Amone, A, De Mitri, I, D’Ettorre Piazzoli, B, Di Girolamo, T, Ding, XH, Di Sciascio, G, Feng, CF, Feng, ZYa, Feng, ZYo, Galeazzi, F, Giroletti, E, Gou, QB, Guo, YQ, He, HH, Hu, HaB, Hu, HoB, Huang, Q, Iacovacci, M, Iuppa, R, James, I, Jia, HY, Li, HJ, Li, JY, Li, XX, Liguori, G, Liu, C, Liu, CQ, Liu, J, Liu, MY, Lu, H, Ma, LL, Ma, XH, Mancarella, G, Mari, SM, Marsella, G, Martello, D, Mastroianni, S, Montini, P, Ning, CC, Pagliaro, A, Panareo, M, Panico, B, Perrone, L, Pistilli, P, Ruggieri, F, Salvini, P, Santonico, R, Sbano, SN, Shen, PR, Sheng, XD, Shi, F, Surdo, A, Tan, YH, Vallania, P, Vernetto, S, Vigorito, C, Wang, B, Wang, H, Wu, CY, Wu, HR, Xu, B, Xue, L, Yang, QY, Yang, XC, Yao, ZG, Yuan, AF, Zha, M, Zhang, HM, Zhang, JLi, Zhang, JLo, Zhang, L, Zhang, P, Zhang, XY, Zhang, Y, Zhao, J, Zhou, XX, Zhu, FR, Zhu, QQ, and Zizzi, G
Subjects: Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Range (particle radiation), Photon, Degree (graph theory), 010308 nuclear & particles physics, Settore FIS/01 - Fisica Sperimentale, Gamma ray, Flux, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, 01 natural sciences, gamma rays, Wavelength, Settore FIS/05 - Astronomia E Astrofisica, Space and Planetary Science, Coincident, 0103 physical sciences, Gamma Rays, Argo-YBJ, Extended Air Shower Detectors, Astrophysics - High Energy Astrophysical Phenomena, 010303 astronomy & astrophysics, general [gamma rays], Energy (signal processing)
Abstract: We report the observation of a very high energy \gamma-ray source, whose position is coincident with HESS J1841-055. This source has been observed for 4.5 years by the ARGO-YBJ experiment from November 2007 to July 2012. Its emission is detected with a statistical significance of 5.3 standard deviations. Parameterizing the source shape with a two-dimensional Gaussian function we estimate an extension \sigma=(0.40(+0.32,-0.22}) degree, consistent with the HESS measurement. The observed energy spectrum is dN/dE =(9.0-+1.6) x 10^{-13}(E/5 TeV)^{-2.32-+0.23} photons cm^{-2} s^{-1} TeV^{-1}, in the energy range 0.9-50 TeV. The integral \gamma-ray flux above 1 TeV is 1.3-+0.4 Crab units, which is 3.2-+1.0 times the flux derived by HESS. The differences in the flux determination between HESS and ARGO-YBJ, and possible counterparts at other wavelengths are discussed., Comment: 17 pages, 4 figures, have been accepted for publication in ApJ

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18 results on '"Ning, C. C."'

1. EAS age determination from the study of the lateral distribution of charged particles near the shower axis with the ARGO-YBJ experiment

2. Observation of the thunderstorm-related ground cosmic ray flux variations by ARGO-YBJ

3. Knee of the cosmic hydrogen and helium spectrum below 1 PeV measured by ARGO-YBJ and a Cherenkov telescope of LHAASO

4. Search for Gamma-Ray Bursts with the ARGO-YBJ Detector in Shower Mode

5. Long-term monitoring of the TeV emission from Mrk 421 with the ARGO-YBJ experiment

6. The cosmic ray proton plus helium energy spectrum measured by the ARGO-YBJ experiment in the energy range 3-300 TeV

7. TeV gamma-ray survey of the Northern sky using the ARGO-YBJ detector

8. Intrinsic linearity of bakelite Resistive Plate Chambers operated in streamer mode

9. Search for Gamma-Ray Emission from the Sun during Solar Minimum with the ARGO-YBJ Experiment

10. Absolute-energy-scale calibration of ARGO-YBJ for light primaries in multi-TeV region with the Moon shadow observation

11. Galactic Cosmic-Ray Anisotropy in the Northern hemisphere from the ARGO-YBJ Experiment during 2008-2012

12. Detection of thermal neutrons with the PRISMA-YBJ array in extensive air showers selected by the ARGO-YBJ experiment

13. 4.5 YEARS OF MULTI-WAVELENGTH OBSERVATIONS OF MRK 421 DURING THE ARGO-YBJ AND FERMI COMMON OPERATION TIME

14. OBSERVATION OF THE TeV GAMMA-RAY SOURCE MGRO J1908+06 WITH ARGO-YBJ

15. Observation of TeV gamma rays from the Cygnus region with the ARGO-YBJ experiment

16. Long-term monitoring of mrk 501 for its very high energy γ emission and a flare in 2011 october

17. Highlights from the ARGO-YBJ Experiment

18. Observation of TeV gamma-rays from the unidentified source HESS J1841-055 with the ARGO-YBJ experiment

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18 results on '"Ning, C. C."'

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