Hadron-gamma discrimination from an orbital UHECR observatory (2009)
Supanitsky, A. D., Medina-Tanco, G., Asano, K., Cline, D., Ebisuzaki, T., Inoue, S., ...
The identification of very high energy photons is of great importance for the understanding of the origin of extreme energy cosmic rays (EECR). Several can be the sources of high energy photons at...
Development of neutrino initiated cascades at mid and high altitudes in the atmosphere (2009)
Supanitsky, A. D., Medina-Tanco, G., Asano, K., Cline, D., Ebisuzaki, T., Inoue, S., ...
Neutrinos are a very promising messenger at tens of EeV and above. They can be produced by several channels, namely as by products of hadronic interactions at the sources, as the main products of the...
Supanitsky, A. D., Medina-Tanco, G.
The simulations of extensive air showers as well as the detectors involved in their detection play a fundamental role in the study of the high energy cosmic rays. At the highest energies the detailed...
A new surface parameter for composition studies at high energies (2009)
Ros, G., Supanitsky, A. D., Medina-Tanco, G. A., Del Peral, L., Rodriguez-Frias, M. D.
A new family of parameters intended for composition studies is presented. They make exclusive use of surface data combining the information from the total signal at each triggered detector and the...
The Fluorescence Detector of the Pierre Auger Observatory (2009)
Abreu, P., Aglietta, M., Aguirre, C., Ahn, E. J., Allard, D., ...
The Pierre Auger Observatory is a hybrid detector for ultra-high energy cosmic rays. It combines a surface array to measure secondary particles at ground level together with a fluorescence detector...
Abreu, P., Aglietta, M., Aguirre, C., Ahn, E. J., Allard, D., ...
Studies of the correlations of ultra-high energy cosmic ray directions with extra-Galactic objects, of general anisotropy, of photons and neutrinos, and of other astrophysical effects, with the...
Operations of and Future Plans for the Pierre Auger Observatory (2009)
Abreu, P., Aglietta, M., Aguirre, C., Ahn, E. J., Allard, D., ...
Technical reports on operations and features of the Pierre Auger Observatory, including ongoing and planned enhancements and the status of the future northern hemisphere portion of the Observatory....
Calibration and Monitoring of the Pierre Auger Observatory (2009)
Abreu, P., Aglietta, M., Aguirre, C., Ahn, E. J., Allard, D., ...
Reports on the atmospheric monitoring, calibration, and other operating systems of the Pierre Auger Observatory. Contributions to the 31st International Cosmic Ray Conference, Lodz, Poland, July 2009.
The Cosmic Ray Energy Spectrum and Related Measurements with the Pierre Auger Observatory (2009)
Abreu, P., Aglietta, M., Aguirre, C., Ahn, E. J., Allard, D., ...
Studies of the cosmic ray energy spectrum at the highest energies with the Pierre Auger Observatory.
Studies of Cosmic Ray Composition and Air Shower Structure with the Pierre Auger Observatory (2009)
Abreu, P., Aglietta, M., Aguirre, C., Ahn, E. J., Allard, D., ...
Studies of the composition of the highest energy cosmic rays with the Pierre Auger Observatory, including examination of hadronic physics effects on the structure of extensive air showers....
On the possibility of primary identification of individual cosmic ray showers (2008)
Supanitsky, A. D., Medina-Tanco, G., Etchegoyen, A.
The transition between the Galactic and extragalactic cosmic ray components could take place either in the region of the spectrum known as the second knee or in the ankle. There are several models of...
A New Numerical Technique to Determine Primary Cosmic Ray Composition in the Ankle Region (2008)
Supanitsky, A. D., Medina-Tanco, G., Etchegoyen, A.
In this paper we introduce a new multiparametric technique that attempts to tackle simultaneously the problems of composition determination and hadronic interaction uncertainty. Employing simulations...
Effect of multiple reusing of simulated air showers in detector simulations (2008)
Supanitsky, A. D., Medina-Tanco, G.
The study of high energy cosmic rays requires detailed Monte Carlo simulations of both, extensive air showers and the detectors involved in their detection. In particular, the energy calibration of...
Allard, D., Armengaud, E., Aublin, J., Beau, T., Berat, C., Billoir, P., ...
The surface detector array of the Pierre Auger Observatory is sensitive to Earth-skimming tau-neutrinos $\nu_\tau$ that interact in the Earth's crust. Tau leptons from $\nu_\tau$ charged-current...
Allard, D., Armengaud, E., Aublin, J., Beau, T., Berat, C., Billoir, P., ...
The surface detector array of the Pierre Auger Observatory is sensitive to Earth-skimming tau-neutrinos $\nu_\tau$ that interact in the Earth's crust. Tau leptons from $\nu_\tau$ charged-current...
Allard, D., Armengaud, E., Aublin, J., Beau, T., Berat, C., Billoir, P., ...
The surface detector array of the Pierre Auger Observatory is sensitive to Earth-skimming tau-neutrinos $\nu_\tau$ that interact in the Earth's crust. Tau leptons from $\nu_\tau$ charged-current...
Underground Muon Counters as a Tool for Composition Analyses (2008)
Supanitsky, A. D., Etchegoyen, A., Medina-Tanco, G., Allekotte, I., Berisso, M. Gómez, Medina, M. C.
The transition energy from galactic to extragalactic cosmic ray sources is still uncertain, but it should be associated either with the region of the spectrum known as the second knee or with the...
Perturbative exponential expansion and matter neutrino oscillations (2008)
Supanitsky, A. D., D'Olivo, J. C., Medina-Tanco, G.
We derive an analytical description of neutrino oscillations in matter based on the Magnus exponential representation of the time evolution operator. Our approach is valid in a wide range of the...
Analytical description of the Day-Night neutrino asymmetry (2007)
Supanitsky, A. D., D'Olivo, J. C., Medina-Tanco, G. A.
We present a new treatment of the Earth matter effects on the neutrino oscillations that is valid for an arbitrary density profile. When applied to the the study of the day-night effect on the solar...
Abraham, J., Aglietta, M., Aguirre, C., Allard, D., Allekotte, I., Allison, P., ...
An upper limit of 16% (at 95% c.l.) is derived for the photon fraction in cosmic rays with energies greater than $10^{19}$ eV, based on observations of the depth of shower maximum performed with the...
Medina, M. C., Berisso, M. Gomez, Allekotte, I., Etchegoyen, A., Tanco, G. Medina, Supanitsky, A. D.
The Pierre Auger Observatory has been designed to study the highest-energy cosmic rays in nature (E > 10^{18.5} eV). The determination of their arrival direction, energy and composition is performed...