1. Search for photons above ▫$10^19$▫ eV with the surface detector of the Pierre Auger ObservatoryP. Abreu, Andrej Filipčič, Jon Paul Lundquist, Shima Ujjani Shivashankara, Samo Stanič, Serguei Vorobiov, Danilo Zavrtanik, Marko Zavrtanik, Lukas Zehrer, 2023, izvirni znanstveni članek Opis: We use the surface detector of the Pierre Auger Observatory to search for air showers initiated by photons with an energy above 10[sup]19 eV. Photons in the zenith angle range from 30 deg. to 60 deg. can be identified in the overwhelming background of showers initiated by charged cosmic rays through the broader time structure of the signals induced in the water-Cherenkov detectors of the array and the steeper lateral distribution of shower particles reaching ground. Applying the search method to data collected between January 2004 and June 2020, upper limits at 95% CL are set to an E[sup]-2 diffuse flux of ultra-high energy photons above 10[sup]19 eV, 2 × 10[sup]19 eV and 4 × 10[sup]19 eV amounting to 2.11 × 10[sup]-3, 3.12 × 10[sup]-4 and 1.72 × 10[sup]-4 km-2 sr-1 yr-1, respectively. While the sensitivity of the present search around 2 × 10[sup]19 eV approaches expectations of cosmogenic photon fluxes in the case of a pure-proton composition, it is one order of magnitude above those from more realistic mixed-composition models. The inferred limits have also implications for the search of super-heavy dark matter that are discussed and illustrated. Ključne besede: ultra-high-energy cosmic rays, UHE photons, Pierre Auger Observatory, extensive air showers, water Cherenkov detectors Objavljeno v RUNG: 18.08.2023; Ogledov: 615; Prenosov: 8 Celotno besedilo (2,46 MB) Gradivo ima več datotek! Več... |
2. Search for ultra-high-energy photons from gravitational wave sources with the Pierre Auger ObservatoryA. Abdul Halim, P. Abreu, M. Aglietta, Andrej Filipčič, Jon Paul Lundquist, Shima Ujjani Shivashankara, Samo Stanič, Serguei Vorobiov, Danilo Zavrtanik, Marko Zavrtanik, 2023, izvirni znanstveni članek Ključne besede: visokoenergijski fotoni, gravitacijski valovi, observatorij P. Auger Objavljeno v RUNG: 21.07.2023; Ogledov: 637; Prenosov: 4 Celotno besedilo (636,37 KB) Gradivo ima več datotek! Več... |
3. Limits to gauge coupling in the dark sector set by the nonobservation of instanton-induced decay of super-heavy dark matter in the Pierre Auger Observatory dataP. Abreu, Andrej Filipčič, Jon Paul Lundquist, Samo Stanič, Serguei Vorobiov, Danilo Zavrtanik, Marko Zavrtanik, Lukas Zehrer, 2023, izvirni znanstveni članek Ključne besede: ultra-high energy cosmic rays, UHE photon flux upper limits, super-heavy dark matter models, instantons, Pierre Auger Observatory Objavljeno v RUNG: 09.02.2023; Ogledov: 972; Prenosov: 0 Gradivo ima več datotek! Več... |
4. Cosmological implications of photon-flux upper limits at ultrahigh energies in scenarios of Planckian-interacting massive particles for dark matterP. Abreu, Andrej Filipčič, Jon Paul Lundquist, Samo Stanič, Serguei Vorobiov, Danilo Zavrtanik, Marko Zavrtanik, Lukas Zehrer, 2023, izvirni znanstveni članek Ključne besede: ultra-high energy, cosmic rays, Pierre Auger Observatory, UHE photon flux upper limits, super-heavy dark matter models Objavljeno v RUNG: 09.02.2023; Ogledov: 1049; Prenosov: 0 Gradivo ima več datotek! Več... |
5. Searches for Ultra-High-Energy Photons at the Pierre Auger ObservatoryP. Abreu, Andrej Filipčič, Jon Paul Lundquist, Shima Ujjani Shivashankara, Samo Stanič, Serguei Vorobiov, Danilo Zavrtanik, Marko Zavrtanik, Lukas Zehrer, 2022, pregledni znanstveni članek Opis: The Pierre Auger Observatory, being the largest air-shower experiment in the world, offers an unprecedented exposure to neutral particles at the highest energies. Since the start of data taking more than 18 years ago, various searches for ultra-high-energy (UHE, E > 10[sup]17 eV) photons have been performed: either for a diffuse flux of UHE photons, for point sources of UHE photons or for UHE photons associated with
transient events like gravitational wave events. In the present paper, we summarize these searches and review
the current results obtained using the wealth of data collected by the Pierre Auger Observatory. Ključne besede: photons, ultra-high energies, air showers, Pierre Auger Observatory, upper limits, transients Objavljeno v RUNG: 03.01.2023; Ogledov: 1198; Prenosov: 0 Gradivo ima več datotek! Več... |
6. Arrival directions of cosmic rays above 32 EeV from phase one of the Pierre Auger ObservatoryP. Abreu, M. Aglietta, J. M. Albury, Andrej Filipčič, Jon Paul Lundquist, Samo Stanič, Darko Veberič, Serguei Vorobiov, Danilo Zavrtanik, Marko Zavrtanik, Lukas Zehrer, 2022, izvirni znanstveni članek Ključne besede: Kozmični žarki, ekstremne energije, vpadne smeri, Observatorij Pierre Auger Objavljeno v RUNG: 21.09.2022; Ogledov: 1107; Prenosov: 31 Povezava na celotno besedilo Gradivo ima več datotek! Več... |
7. |
8. Protein purification strategies must consider downstream applications and individual biological characteristicsKim Remans, Mario Lebendiker, Celeste Abreu, Mariano Maffei, Shaila Sellathurai, Marina May, Ondrej Vanek, Ario De Marco, 2022, pregledni znanstveni članek Ključne besede: protein purification, quality control, protein functionality Objavljeno v RUNG: 08.04.2022; Ogledov: 1411; Prenosov: 193 Celotno besedilo (2,56 MB) |
9. Testing effects of Lorentz invariance violation in the propagation of astroparticles with the Pierre Auger ObservatoryP. Abreu, Andrej Filipčič, Jon Paul Lundquist, Samo Stanič, Serguei Vorobiov, Danilo Zavrtanik, Marko Zavrtanik, Lukas Zehrer, 2022, izvirni znanstveni članek Ključne besede: cosmic ray experiments, ultra high energy, cosmic rays, physics of the early universe, Pierre Auger Observatory, Lorentz invariance violation effects Objavljeno v RUNG: 18.01.2022; Ogledov: 1557; Prenosov: 38 Povezava na celotno besedilo Gradivo ima več datotek! Več... |
10. The energy spectrum of cosmic rays beyond the turn-down around 10[sup]17 eV as measured with the surface detector of the Pierre Auger ObservatoryP. Abreu, Andrej Filipčič, Jon Paul Lundquist, Samo Stanič, Serguei Vorobiov, Danilo Zavrtanik, Marko Zavrtanik, Lukas Zehrer, 2021, izvirni znanstveni članek Ključne besede: kozmični žarki, spektertalni detektor, Observatorij Pierre Auger Objavljeno v RUNG: 08.11.2021; Ogledov: 1590; Prenosov: 0 Gradivo ima več datotek! Več... |