41. Indications of Proton-Dominated Cosmic-Ray Composition above 1.6 EeVJ. P. Lundquist, R.U. Abbasi, 2010, original scientific article Abstract: We report studies of ultrahigh-energy cosmic-ray composition via analysis of depth of air shower maximum (Xmax), for air shower events collected by the High-Resolution Fly’s Eye (HiRes) observatory. The HiRes data are consistent with a constant elongation rate d⟨Xmax⟩/d[log(E)] of 47.9 ± 6.0 (stat) ± 3.2 (syst) g/cm^2/decade for energies between 1.6 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 4×10^18 eV.
Found in: ključnih besedah
Summary of found: ...We report studies of ultrahigh- energy cosmic-ray composition via analysis of depth of... ...with a predominantly protonic composition of cosmic rays when interpreted via the QGSJET01 and QGSJET-II...
Keywords: Cosmic rays, Energy spectrum, Telescope Array, Hybrid, Ultra high energy
Published: 27.04.2020; Views: 449; Downloads: 0
 Fulltext (314,89 KB) |
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43. The surface detector array of the Telescope Array experimentJ. P. Lundquist, T. Abu-Zayyad, 2012, original scientific article Abstract: The Telescope Array (TA) experiment, located in the western desert of Utah, USA, is designed for the observation of extensive air showers from extremely high energy cosmic rays. The experiment has a surface detector array surrounded by three fluorescence detectors to enable simultaneous detection of shower particles at ground level and fluorescence photons along the shower track. The TA surface detectors and fluorescence detectors started full hybrid observation in March, 2008. In this article we describe the design and technical features of the TA surface detector.
Found in: ključnih besedah
Summary of found: ...of extensive air showers from extremely high energy cosmic rays. The experiment has a surface...
Keywords: Ultra-high energy cosmic rays, Telescope Array experiment, Extensive air shower array
Published: 19.05.2020; Views: 363; Downloads: 0
Fulltext (1,81 MB) |
44. New air fluorescence detectors employed in the Telescope Array experimentJ. P. Lundquist, H. Tokuno, 2012, original scientific article Abstract: Since 2007, the Telescope Array (TA) experiment, based in Utah, USA, has been observing ultra high energy cosmic rays to understand their origins. The experiment includes a surface detector (SD) array and three fluorescence detector (FD) stations. The FD stations, installed surrounding the SD array, measure the air fluorescence light emitted from extensive air showers (EASs) for precise determination of their energies and species. The detectors employed at one of the three FD stations were relocated from the High Resolution Fly's Eye (HiRes) experiment. At the other two stations, newly designed detectors were constructed for the TA experiment. An FD consists of a primary mirror and a camera equipped with photomultiplier tube pixels. To obtain the EAS parameters with high accuracy, understanding the FD optical characteristics is important. In this paper, we report the characteristics and installation of the new FDs and the performances of the FD components. The results of the monitored mirror reflectance during the observation time are also described in this report.
Found in: ključnih besedah
Summary of found: ...Utah, USA, has been observing ultra high energy cosmic rays to understand their origins. The...
Keywords: Ultra high energy cosmic rays, Extensive air showers, Air fluorescence light detectors
Published: 19.05.2020; Views: 331; Downloads: 0
Fulltext (1,44 MB) |
45. Highlights from the Pierre Auger ObservatoryLukas Zehrer, Marko Zavrtanik, Danilo Zavrtanik, Lili Yang, Serguei Vorobiov, Marta Trini, Samo Stanič, Gašper Kukec Mezek, Andrej Filipčič, Antonella Castellina, 2019, published scientific conference contribution Found in: ključnih besedah
Summary of found: ... ultra-high energy cosmic rays, extensive air showers, Pierre...
Keywords: ultra-high energy cosmic rays, extensive air showers, Pierre Auger Observatory
Published: 16.06.2020; Views: 332; Downloads: 18
Fulltext (4,92 MB) |
46. Anisotropies of the highest energy cosmic-ray events recorded by the Pierre Auger Observatory in 15 years of operationLukas Zehrer, Marko Zavrtanik, Danilo Zavrtanik, Lili Yang, Serguei Vorobiov, Marta Trini, Samo Stanič, Gašper Kukec Mezek, Andrej Filipčič, Lorenzo Caccianiga, 2019, published scientific conference contribution Found in: ključnih besedah
Summary of found: ... ultra-high energy cosmic rays (UHECR), UHECR anisotropies, Pierre...
Keywords: ultra-high energy cosmic rays (UHECR), UHECR anisotropies, Pierre Auger Observatory
Published: 16.06.2020; Views: 311; Downloads: 17
Fulltext (1,65 MB) |
47. Long Term Performance of the Pierre Auger ObservatoryLukas Zehrer, Marko Zavrtanik, Danilo Zavrtanik, Lili Yang, Serguei Vorobiov, Marta Trini, Samo Stanič, Gašper Kukec Mezek, Andrej Filipčič, Koun Choi, 2019, published scientific conference contribution Found in: ključnih besedah
Summary of found: ... ultra-high energy cosmic rays, Pierre Auger Observatory, long...
Keywords: ultra-high energy cosmic rays, Pierre Auger Observatory, long term performance
Published: 16.06.2020; Views: 310; Downloads: 18
Fulltext (1,14 MB) |
48. Measurement of the cosmic ray flux near the second knee with the Pierre Auger ObservatoryLukas Zehrer, Marko Zavrtanik, Danilo Zavrtanik, Lili Yang, Serguei Vorobiov, Marta Trini, Samo Stanič, Gašper Kukec Mezek, Andrej Filipčič, Alan Coleman, 2019, published scientific conference contribution Found in: ključnih besedah
Summary of found: ... ultra-high energy cosmic rays (UHECR), UHECR energy spectrum,...
Keywords: ultra-high energy cosmic rays (UHECR), UHECR energy spectrum, second knee, Pierre Auger Observatory
Published: 16.06.2020; Views: 326; Downloads: 17
Fulltext (557,92 KB) |
49. The Energy Scale of the Pierre Auger ObservatoryLukas Zehrer, Marko Zavrtanik, Danilo Zavrtanik, Lili Yang, Serguei Vorobiov, Marta Trini, Samo Stanič, Gašper Kukec Mezek, Andrej Filipčič, Bruce R. Dawson, 2019, published scientific conference contribution Found in: ključnih besedah
Summary of found: ... ultra-high energy cosmic rays, Pierre Auger Observatory, energy...
Keywords: ultra-high energy cosmic rays, Pierre Auger Observatory, energy scale
Published: 16.06.2020; Views: 300; Downloads: 15
Fulltext (277,08 KB) |
50. Social Impact of Outreach at the Pierre Auger ObservatoryLukas Zehrer, Marko Zavrtanik, Danilo Zavrtanik, Lili Yang, Serguei Vorobiov, Marta Trini, Samo Stanič, Gašper Kukec Mezek, Andrej Filipčič, Beatriz García, 2019, published scientific conference contribution Found in: ključnih besedah
Summary of found: ... ultra-high energy cosmic rays, Pierre Auger Observatory, outreach,...
Keywords: ultra-high energy cosmic rays, Pierre Auger Observatory, outreach, social impact
Published: 16.06.2020; Views: 290; Downloads: 15
Fulltext (5,83 MB) |
