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10 results on '"Brusova, O. A."'

1. Analysis of large-scale anisotropy of ultra-high energy cosmic rays in HiRes data

Author

Abbasi, R. U., Abu-Zayyad, T., Allen, M., Amann, J. F., Archbold, G., Belov, K., Belz, J. W., Bergman, D. R., Blake, S. A., Brusova, O. A., Burt, G. W., Cannon, C., Cao, Z., Deng, W., Fedorova, Y., Findlay, J., Finley, C. B., Gray, R. C., Hanlon, W. F., Hoffman, C. M., Holzscheiter, M. H., Hughes, G., Hüntemeyer, P., Ivanov, D., Jones, B. F, Jui, C. C. H., Kim, K., Kirn, M. A., Koers, H., Loh, E. C., Maestas, M. M., Manago, N., Marek, L. J., Martens, K., Matthews, J. A. J., Matthews, J. N., Moore, S. A., O'Neill, A., Painter, C. A., Perera, L., Reil, K., Riehle, R., Roberts, M. D., Rodriguez, D., Sasaki, M., Schnetzer, S. R., Scott, L. M., Sinnis, G., Smith, J. D., Sokolsky, P., Song, C., Springer, R. W., Stokes, B. T., Stratton, S. R., Thomas, J. R., Thomas, S. B., Thomson, G. B., Tinyakov, P., Tupa, D., Wiencke, L. R., Zech, A., and Zhang, X.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

Stereo data collected by the HiRes experiment over a six year period are examined for large-scale anisotropy related to the inhomogeneous distribution of matter in the nearby Universe. We consider the generic case of small cosmic-ray deflections and a large number of sources tracing the matter distribution. In this matter tracer model the expected cosmic ray flux depends essentially on a single free parameter, the typical deflection angle theta. We find that the HiRes data with threshold energies of 40 EeV and 57 EeV are incompatible with the matter tracer model at a 95% confidence level unless theta is larger than 10 degrees and are compatible with an isotropic flux. The data set above 10 EeV is compatible with both the matter tracer model and an isotropic flux., Comment: 9 pages, 5 Postscript figures

Published
2010
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2. Indications of Proton-Dominated Cosmic Ray Composition above 1.6 EeV

Author

Abbasi, R. U., Abu-Zayyad, T., Al-Seady, M., Allen, M., Amman, J. F., Anderson, R. J., Archbold, G., Belov, K., Belz, J. W., Bergman, D. R., Blake, S. A., Brusova, O. A., Burt, G. W., Cannon, C., Cao, Z., Deng, W., Fedorova, Y., Finley, C. B., Gray, R. C., Hanlon, W. F., Hoffman, C. M., Holzscheiter, M. H., Hughes, G., Huentemeyer, P., Jones, B. F, Jui, C. C. H., Kim, K., Kirn, M. A., Loh, E. C., Lundquist, J. P., Maestas, M. M., Manago, N., Marek, L. J., Martens, K., Matthews, J. A. J., Matthews, J. N., Moore, S. A., O'Neill, A., Painter, C. A., Perera, L., Reil, K., Riehle, R., Roberts, M., Rodriguez, D., Sasaki, N., Schnetzer, S. R., Scott, L. M., Sinnis, G., Smith, J. D., Sokolsky, P., Song, C., Springer, R. W., Stokes, B. T., Stratton, S., Thomas, S. B., Thomas, J. R., Thomson, G. B., Tupa, D., Zhang, X., and Zech, A.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We report studies of ultra-high energy cosmic ray composition via analysis of depth of airshower maximum (Xmax), for airshower events collected by the High Resolution Fly's Eye (HiRes) observatory. The HiRes data are consistent with a constant elongation rate d/d(log(E)) of 47.9 +- 6.0 (stat.) +- 3.2 (syst.)g/cm^2/decade for energies between 1.6 EeV and 63 EeV, and are consistent with a predominantly protonic composition of cosmic rays when interpreted via the QGSJET01 and QGSJET-II high-energy hadronic interaction models. These measurements constrain models in which the galactic-to-extragalactic transition is the cause of the energy spectrum "ankle' at 4 EeV., Comment: 11 pages, 4 figures, accepted for publication in Physical Review Letters

Published
2009
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3. Measurement of the Flux of Ultra High Energy Cosmic Rays by the Stereo Technique

Author

Abbasi, R. U., Abu-Zayyad, T., Al-Seady, M., Allen, M., Amann, J. F., Archbold, G., Belov, K., Belz, J. W., Bergman, D. R., Blake, S. A., Brusova, O. A., Burt, G. W., Cannon, C., Cao, Z., Deng, W., Fedorova, Y., Findlay, J., Finley, C. B., Gray, R. C., Hanlon, W. F., Hoffman, C. M., Holzscheiter, M. H., Hughes, G., Huntemeyer, P., Ivanov, D., Jones, B. F., Jui, C. C. H., Kim, K., Kirn, M. A., Loh, E. C., Maestas, M. M., Manago, N., Marek, L. J., Martens, K., Matthews, J. A. J., Matthews, J. N., Moore, S. A., O'Neil, A., Painter, C. A., Perera, L., Reil, K., Riehle, R., Roberts, M. D., Rodriguez, D., Sasaki, M., Schnetzer, S. R., Scott, L. M., Sinnis, G., Smith, J. D., Snow, R., Sokolsky, P., Springer, R. W., Stokes, B. T., Stratton, S. R., Thomas, J. R., Thomas, S. B., Thomson, G. B., Tupa, D., Wiencke, L. R., Zech, A., Zhang, B. K., Zhang, X., and Zhang, Y.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Extragalactic Astrophysics
Abstract

The High Resolution Fly's Eye experiment has measured the flux of ultrahigh energy cosmic rays using the stereoscopic air fluorescence technique. The HiRes experiment consists of two detectors that observe cosmic ray showers via the fluorescence light they emit. HiRes data can be analyzed in monocular mode, where each detector is treated separately, or in stereoscopic mode where they are considered together. Using the monocular mode the HiRes collaboration measured the cosmic ray spectrum and made the first observation of the Greisen-Zatsepin-Kuzmin cutoff. In this paper we present the cosmic ray spectrum measured by the stereoscopic technique. Good agreement is found with the monocular spectrum in all details., Comment: 20 pages, 10 figures

Published
2009
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4. Search for Correlations between HiRes Stereo Events and Active Galactic Nuclei

Author

Abbasi, R. U., Abu-Zayyad, T., Allen, M., Amman, J. F., Archbold, G., Belov, K., Belz, J. W., BenZvi, S. Y., Bergman, D. R., Blake, S. A., Boyer, J. H., Brusova, O. A., Burt, G. W., Cannon, C., Cao, Z., Deng, W., Fedorova, Y., Findlay, J., Finley, C. B., Gray, R. C., Hanlon, W. F., Hoffman, C. M., Holzscheiter, M. H., Hughes, G., Huntemeyer, P., Ivanov, D., Jones, B. F, Jui, C. C. H., Kim, K., Kirn, M. A., Knapp, B. C., Loh, E. C., Maestas, M. M., Manago, N., Mannel, E. J., Marek, L. J., Martens, K., Matthews, J. N., Moore, S. A., O'Neill, A., Painter, C. A., Perera, L., Reil, K., Riehle, R., Roberts, M. D., Sasaki, D. Rodriguez N., Schnetzer, S. R., Scott, L. M., Seman, M., Sinnis, G., Smith, J. D., Snow, R., Sokolsky, P., Song, C., Springer, R. W., Stokes, B. T., Stratton, S. R., Thomas, J. R., Thomas, S. B., Thomson, G. B., Tupa, D., Wiencke, L. R., Zech, A., and Zhang, X.

Subjects
Astrophysics
Abstract

We have searched for correlations between the pointing directions of ultrahigh energy cosmic rays observed by the High Resolution Fly's Eye experiment and Active Galactic Nuclei (AGN) visible from its northern hemisphere location. No correlations, other than random correlations, have been found. We report our results using search parameters prescribed by the Pierre Auger collaboration. Using these parameters, the Auger collaboration concludes that a positive correlation exists for sources visible to their southern hemisphere location. We also describe results using two methods for determining the chance probability of correlations: one in which a hypothesis is formed from scanning one half of the data and tested on the second half, and another which involves a scan over the entire data set. The most significant correlation found occurred with a chance probability of 24%., Comment: 13 pages, 1 table, 5 figures

Published
2008
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5. An upper limit on the electron-neutrino flux from the HiRes detector

Author

Abbasi, R. U., Abu-Zayyad, T., Allen, M., Amann, J. F., Archbold, G., Belov, K., Belz, J. W., Zvi, S. Y. Ben, Bergman, D. R., Biesiadecka, A., Blake, S. A., Boyer, J. H., Brusova, O. A., Burt, G. W., Cannon, C., Cao, Z., Deng, W., Fedorova, Y., Findlay, J., Finley, C. B., Gray, R. C., Hanlon, W. F., Hoffman, C. M., Holzscheiter, M. H., Hughes, G., Huentemeyer, P., Ivanov, D., Jones, B. F, Jui, C. C. H., Kim, K., Kirn, M. A., Knapp, B. C., Loh, E. C., Maestas, M. M., Manago, N., Mannel, E. J., Marek, L. J., Martens, K., Matthews, J. A. J., Matthews, J. N., Moore, S. A., O'Neill, A., Painter, C. A., Perera, L., Reil, K., Riehle, R., Roberts, M. D., Rodriguez, D., Sasaki, M., Schnetzer, S. R., Scott, L. M., Seman, M., Sinnis, G., Smith, J. D., Snow, R., Sokolsky, P., Song, C., Springer, R. W., Stokes, B. T., Stratton, S. R., Thomas, J. R., Thomas, S. B., Thomson, G. B., Tupa, D., Wiencke, L. R., Zech, A., and Zhang, X.

Subjects
Astrophysics
Abstract

Air-fluorescence detectors such as the High Resolution Fly's Eye (HiRes) detector are very sensitive to upward-going, Earth-skimming ultrahigh energy electron-neutrino-induced showers. This is due to the relatively large interaction cross sections of these high-energy neutrinos and to the Landau-Pomeranchuk-Migdal (LPM) effect. The LPM effect causes a significant decrease in the cross sections for bremsstrahlung and pair production, allowing charged-current electron-neutrino-induced showers occurring deep in the Earth's crust to be detectable as they exit the Earth into the atmosphere. A search for upward-going neutrino-induced showers in the HiRes-II monocular dataset has yielded a null result. From an LPM calculation of the energy spectrum of charged particles as a function of primary energy and depth for electron-induced showers in rock, we calculate the shape of the resulting profile of these showers in air. We describe a full detector Monte Carlo simulation to determine the detector response to upward-going electron-neutrino-induced cascades and present an upper limit on the flux of electron-neutrinos., Comment: 13 pages, 3 figures. submitted to Astrophysical Journal

Published
2008
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6. Radio Detection of Neutrinos from Behind a Mountain

Author

Brusova, O., Anchordoqui, L., Huege, T., and Martens, K.

Subjects
Astrophysics
Abstract

We explore the sensitivity of a neutrino detector employing strongly directional high gain radio antennae to detect the conversion of neutrinos above $10^{16}$ eV in a mountain or the earth crust. The directionality of the antennae will allow both, the low threshold and the suppression of background. This technology would have the advantage that it does not require a suitable atmosphere as optical detectors do and could therefore be deployed at any promising place on the planet. In particular one could choose suitable topographies at latitudes that are matched to promising source candidates., Comment: 4 pages, 5 figures, presented at the ICRC 07

Published
2007

7. The Status of the Telescope Array experiment

Author

Tokuno, H, primary, Abu-Zayyad, T, additional, Aida, R, additional, Allen, M, additional, Azuma, R, additional, Barcikowski, E, additional, Belz, J W, additional, Benno, T, additional, Bergman, D R, additional, Blake, S A, additional, Brusova, O, additional, Cady, R, additional, Cheon, B G, additional, Chiba, J, additional, Chikawa, M, additional, Cho, E J, additional, Cho, L S, additional, Cho, W R, additional, Cohen, F, additional, Doura, K, additional, Ebeling, C, additional, Fujii, H, additional, Fujii, T, additional, Fukuda, T, additional, Fukushima, M, additional, Gorbunov, D, additional, Hanlon, W, additional, Hayashi, K, additional, Hayashi, Y, additional, Hayashida, N, additional, Hibino, K, additional, Hiyama, K, additional, Honda, K, additional, Hughes, G, additional, Iguchi, T, additional, Ikeda, D, additional, Ikuta, K, additional, Innemee, S J J, additional, Inoue, N, additional, Ishii, T, additional, Ishimori, R, additional, Ivanov, D, additional, Iwamoto, S, additional, Jui, C C H, additional, Kadota, K, additional, Kakimoto, F, additional, Kalashev, O, additional, Kanbe, T, additional, Kang, H, additional, Kasahara, K, additional, Kawai, H, additional, Kawakami, S, additional, Kawana, S, additional, Kido, E, additional, Kim, B G, additional, Kim, H B, additional, Kim, J H, additional, Kitsugi, A, additional, Kobayashi, K, additional, Koers, H, additional, Kondo, Y, additional, Kuzmin, V, additional, Kwon, Y J, additional, Lim, J H, additional, Lim, S I, additional, Machida, S, additional, Martens, K, additional, Martineau, J, additional, Matsuda, T, additional, Matsuyama, T, additional, Matthews, J N, additional, Minamino, M, additional, Miyata, K, additional, Miyauchi, H, additional, Murano, Y, additional, Nakamura, T, additional, Nam, S W, additional, Nonaka, T, additional, Ogio, S, additional, Ohnishi, M, additional, Ohoka, H, additional, Okuda, T, additional, Oshima, A, additional, Ozawa, S, additional, Park, I H, additional, Rodriguez, D, additional, Roh, S Y, additional, Rubtsov, G, additional, Ryu, D, additional, Sagawa, H, additional, Sakurai, N, additional, Scott, L M, additional, Shah, P D, additional, Shibata, T, additional, Shimodaira, H, additional, Shin, B K, additional, Smith, J D, additional, Sokolsky, P, additional, Sonley, T J, additional, Springer, R W, additional, Stokes, B T, additional, Stratton, S R, additional, Suzuki, S, additional, Takahashi, Y, additional, Takeda, M, additional, Taketa, A, additional, Takita, M, additional, Tameda, Y, additional, Tanaka, H, additional, Tanaka, K, additional, Tanaka, M, additional, Thomas, J R, additional, Thomas, S B, additional, Thomson, G B, additional, Tinyakov, P, additional, Tkachev, I, additional, Tomida, T, additional, Torii, R, additional, Troitsky, S, additional, Tsunesada, Y, additional, Tsuyuguchi, Y, additional, Uchihori, Y, additional, Udo, S, additional, Ukai, H, additional, VanKlaveren, B, additional, Wada, Y, additional, Wood, M, additional, Yamakawa, T, additional, Yamakawa, Y, additional, Yamaoka, H, additional, Yang, J, additional, Yoshida, S, additional, Yoshii, H, additional, and Zundel, Z, additional

Published
2011
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8. An Upper Limit on the Electron‐Neutrino Flux from the HiRes Detector

Author

Abbasi, R. U., primary, Abu‐Zayyad, T., additional, Allen, M., additional, Amann, J. F., additional, Archbold, G., additional, Belov, K., additional, Belz, J. W., additional, Zvi, S. Y. Ben, additional, Bergman, D. R., additional, Biesiadecka, A., additional, Blake, S. A., additional, Boyer, J. H., additional, Brusova, O. A., additional, Burt, G. W., additional, Cannon, C., additional, Cao, Z., additional, Deng, W., additional, Fedorova, Y., additional, Findlay, J., additional, Finley, C. B., additional, Gray, R. C., additional, Hanlon, W. F., additional, Hoffman, C. M., additional, Holzscheiter, M. H., additional, Hughes, G., additional, Hüntemeyer, P., additional, Ivanov, D., additional, Jones, B. F, additional, Jui, C. C. H., additional, Kim, K., additional, Kirn, M. A., additional, Knapp, B. C., additional, Loh, E. C., additional, Maestas, M. M., additional, Manago, N., additional, Mannel, E. J., additional, Marek, L. J., additional, Martens, K., additional, Matthews, J. A. J., additional, Matthews, J. N., additional, Moore, S. A., additional, O’Neill, A., additional, Painter, C. A., additional, Perera, L., additional, Reil, K., additional, Riehle, R., additional, Roberts, M. D., additional, Rodriguez, D., additional, Sasaki, M., additional, Schnetzer, S. R., additional, Scott, L. M., additional, Seman, M., additional, Sinnis, G., additional, Smith, J. D., additional, Snow, R., additional, Sokolsky, P., additional, Song, C., additional, Springer, R. W., additional, Stokes, B. T., additional, Stratton, S. R., additional, Thomas, J. R., additional, Thomas, S. B., additional, Thomson, G. B., additional, Tupa, D., additional, Wiencke, L. R., additional, Zech, A., additional, and Zhang, X., additional

Published
2008
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9. The Telescope Array experiment: status and prospects

Author

Tokuno, H, primary, Abbasi, R U, additional, Abu-Zayyad, T, additional, Azuma, R, additional, Belz, J W, additional, Benno, T, additional, Bergman, D R, additional, Blake, S A, additional, Brusova, O, additional, Cady, R, additional, Cao, Z, additional, Cheon, B G, additional, Chiba, J, additional, Chikawa, M, additional, Cho, I S, additional, Chung, T, additional, Cohen, F, additional, Doura, K, additional, Doyle, T, additional, Endo, A, additional, Fujii, H, additional, Fukuda, T, additional, Fukushima, M, additional, Hayashi, Y, additional, Hayashi, K, additional, Hayashida, N, additional, Hibino, K, additional, Hiyama, K, additional, Honda, K, additional, Huentemeyer, P, additional, Hughes, G A, additional, Iguchi, T, additional, Ikeda, D, additional, Ikuta, K, additional, Inoue, N, additional, Ishii, T, additional, Jui, C C H, additional, Kadota, K, additional, Kakimoto, F, additional, Kanbe, T, additional, Kasahara, K, additional, Kawai, H, additional, Kawakami, S, additional, Kawana, S, additional, Kido, E, additional, Kondo, Y, additional, Kwon, Y J, additional, Machida, S, additional, Martens, K, additional, Matsuda, T, additional, Matsuyama, T, additional, Matthews, J A J, additional, Matthews, J N, additional, Minamino, M, additional, Miyata, K, additional, Mostafa, M, additional, Murano, Y, additional, Nakamura, T, additional, Nam, S, additional, Nonaka, T, additional, Ogio, S, additional, Oh, S, additional, Ohnishi, M, additional, Ohoka, H, additional, Ohshima, A, additional, Okuda, T, additional, Ormes, J, additional, Ozawa, S, additional, Park, I H, additional, Park, J H, additional, Rodriguez, D, additional, Sagawa, H, additional, Sakurai, N, additional, Scott, L M, additional, Shibata, T, additional, Shimizu, N, additional, Shimodaira, H, additional, Sinnis, G, additional, Smith, J D, additional, Sokolsky, P, additional, Springer, R W, additional, Stratton, S R, additional, Suzuki, S, additional, Takeda, M, additional, Taketa, A, additional, Takita, M, additional, Tameda, Y, additional, Tanaka, K, additional, Tanaka, M, additional, Tanaka, H, additional, Taylor, M J, additional, Teshima, M, additional, Thomas, J R, additional, Thomas, S B, additional, Thomson, G B, additional, Tomida, T, additional, Torii, R, additional, Tsunesada, Y, additional, Uchihori, Y, additional, Udo, S, additional, Unno, Y, additional, Wada, Y, additional, Wickwar, V B, additional, Wiencke, L R, additional, Wilkerson, T D, additional, Yamakawa, Y, additional, Yamaoka, H, additional, Yang, J, additional, Yoshida, S, additional, Yoshii, H, additional, and Yun, Y H, additional

Published
2008
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10. Radio detection of neutrinos from behind a mountain

Author

Brusova, O., Anchordoqui, L., Tim Huege, and Martens, K.

Subjects
Astrophysics (astro-ph), FOS: Physical sciences, Astrophysics::Earth and Planetary Astrophysics, Astrophysics, Physics::Geophysics
Abstract

We explore the sensitivity of a neutrino detector employing strongly directional high gain radio antennae to detect the conversion of neutrinos above $10^{16}$ eV in a mountain or the earth crust. The directionality of the antennae will allow both, the low threshold and the suppression of background. This technology would have the advantage that it does not require a suitable atmosphere as optical detectors do and could therefore be deployed at any promising place on the planet. In particular one could choose suitable topographies at latitudes that are matched to promising source candidates., 4 pages, 5 figures, presented at the ICRC 07

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