Bakalova A.

A Terrestrial Gamma-ray Flash with an Asymmetric Footprint Observed at the Pierre Auger Observatory

A. Abdul Halim, P. Abreu, M. Aglietta, M Ahmed et autres

International audience

Depth of maximum of air-shower profiles above 10 17.7 eV measured with the fluorescence detector of the Pierre Auger Observatory

Pierre Auger Collaboration, A. Abdul Halim, P. Abreu, M. Aglietta et autres

We present measurements of the depth of shower maximum, X$_{max}$, for cosmic-ray-induced extensive air showers recorded by the fluorescence detector of the Pierre Auger Observatory over 17 years. The dataset covers primary energies from 10$^{17.7}$ eV to beyond 10$^{19.6}$eV. With improved event …

Search for active-sterile neutrino transitions using Pierre Auger Observatory data

A Abdul Halim, P. Abreu, M. Aglietta, M Ahmed et autres

International audience

Proton-air interaction properties at $\sqrt{s} \simeq 100$ TeV from shower-depth measurements with the Pierre Auger Observatory and their connection to the Muon Puzzle

A Abdul Halim, P. Abreu, M. Aglietta, M Ahmed et autres

International audience

Observation of the Moon and Sun shadows with cosmic rays at an average energy of $\text{7}{\times}\text{10}^\text{17}\,$eV

The LSST Dark Energy Science Collaboration, A Abdul Halim, P. Abreu, M. Aglietta et autres

Interactions of cosmic rays with the Moon and the Sun produce deficits in their arrival-direction distributions relative to an isotropic flux. Such shadows have been observed previously at energies between $10^{12}\,$eV and $10^{16}\,$eV. We report the first observation of the Moon and …

Search for active-sterile neutrino transitions using Pierre Auger Observatory data

the LSST Dark Energy Science Collaboration, A Abdul Halim, P. Abreu, M. Aglietta et autres

We investigate the sensitivity of the Pierre Auger Observatory to physics beyond the Standard Model arising from magnetic-moment-induced transitions between active and heavy sterile neutrinos. Such dipole portal interactions can enhance neutrino-nucleon cross sections above a kinematic threshold set by the sterile …

Proton-air interaction properties at $\sqrt{s} \simeq 100$ TeV from shower-depth measurements with the Pierre Auger Observatory and their connection to the Muon Puzzle

T K ND TPC collaboration, A Abdul Halim, P. Abreu, M. Aglietta et autres

Hybrid measurements at the Pierre Auger Observatory indicate that most high-energy hadronic interaction models underestimate the average depth of the shower maximum, $\langle X_{\max} \rangle$, at a center-of-mass energy of $\sqrt{s}=97.7 \pm 0.4^{+6.6}_{-6.2}\,\mathrm{TeV}$. In this Letter, the hadronic interaction models are shown …

Depth of Maximum of Air-Shower Profiles above 10^17.7 eV Measured with the Fluorescence Detector of the Pierre Auger Observatory

The Pierre Auger Collaboration, A Abdul Halim, P. Abreu, M. Aglietta et autres

We present measurements of the depth of shower maximum, Xmax, for cosmic-ray-induced extensive air showers recorded by the fluorescence detector of the Pierre Auger Observatory over 17 years. The data set covers primary energies from 10^17.7 eV to beyond 10^19.6 eV. With …

Bounds on Lorentz invariance violation from muon fluctuations at the Pierre Auger Observatory

A. (Abdul) Halim, P. Abreu, M. Aglietta, I. Allekotte et autres

International audience

Search for Ultra-high-energy Neutrons from Galactic Sources with the Pierre Auger Observatory

Pierre Auger Collaboration, A Abdul Halim, P. Abreu, M. Aglietta et autres

Deflections in the propagation of charged ultra-high-energy cosmic rays (UHECRs) caused by magnetic fields make the identification of their sources challenging. On the other hand, the arrival directions at Earth of neutrons point directly to their origin. The emission of UHECRs from …

Search for a diffuse flux of photons with energies above tens of PeV at the Pierre Auger Observatory

T K ND TPC collaboration, A Abdul Halim, P. Abreu, M. Aglietta et autres

Diffuse photons of energy above 0.1 PeV, produced through the interactions between cosmic rays and either interstellar matter or background radiation fields, are powerful tracers of the distribution of cosmic rays in the Galaxy. Furthermore, the measurement of a diffuse photon flux …

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Energy Spectrum of Ultrahigh-Energy Cosmic Rays across Declinations − 90 ° to + 44.8 ° as Measured at the Pierre Auger Observatory

A Abdul Halim, P. Abreu, M. Aglietta, I. Allekotte et autres

The energy spectrum of cosmic rays above 2.5 EeV has been measured across the declination range $-90^\circ \leqδ\leq +44.8^\circ$ using data from $\sim 310{,}000$ events accrued at the Pierre Auger Observatory from an exposure of $(104{,}900\pm 3{,}100)$ km$^2\,$sr$\,$yr. No significant variations of …

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