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21.
The energy spectrum of cosmic rays above 1017.2 eV measured by the fluorescence detectors of the Telescope Array experiment in seven years
J. P. Lundquist, R.U. Abbasi, 2016, izvirni znanstveni članek

Opis: The Telescope Array (TA) experiment is the largest detector to observe ultra-high-energy cosmic rays in the northern hemisphere. The fluorescence detectors at two stations of TA are newly constructed and have now completed seven years of steady operation. One advantage of monocular analysis of the fluorescence detectors is a lower energy threshold for cosmic rays than that of other techniques like stereoscopic observations or coincidences with the surface detector array, allowing the measurement of an energy spectrum covering three orders of magnitude in energy. Analyzing data collected during those seven years, we report the energy spectrum of cosmic rays covering a broad range of energies above 10^17.2eV measured by the fluorescence detectors and a comparison with previously published results.
Najdeno v: ključnih besedah
Povzetek najdenega: ...Telescope Array (TA) experiment is the largest detector to observe ultra-high-energy cosmic rays in the...
Ključne besede: Cosmic rays, Ultra-high energy, Fluorescence detector, Energy spectrum, Ankle, GZK cutoff
Objavljeno: 27.04.2020; Ogledov: 357; Prenosov: 0
.pdf Polno besedilo (1,23 MB)

22.
TA Anisotropy Summary
J. P. Lundquist, K. Kawata, 2019, objavljeni znanstveni prispevek na konferenci

Opis: The Telescope Array (TA) is the largest ultra-high-energy cosmic-ray (UHECR) detector in the northern hemisphere. It consists of an array of 507 surface detectors (SD) covering a total 700 km^2 and three fluorescence detector stations overlooking the SD array. In this proceedings, we summarize recent results on the search for directional anisotropy of UHECRs using the latest dataset collected by the TA SD array. We obtained hints of the anisotropy of the UHECRs in the northern sky from the various analyses.
Najdeno v: ključnih besedah
Povzetek najdenega: ...(TA) is the largest ultra-high-energy cosmic-ray (UHECR) detector in the northern hemisphere. It consists of...
Ključne besede: cosmic radiation, UHE detector, fluorescence detector, surface, Telescope Array Experiment, anisotropy, experimental results
Objavljeno: 28.04.2020; Ogledov: 343; Prenosov: 15
.pdf Polno besedilo (1,88 MB)

23.
Cosmic Ray Shower Profile Track Finding for Telescope Array Fluorescence Detectors
J. P. Lundquist, 2016, objavljeni znanstveni prispevek na konferenci

Opis: A simple cosmic ray track finding pattern recognition analysis (PRA) method for fluorescence detectors (FD) has been developed which significantly improves Xmax resolution and its dependence on energy. Events which have a clear rise and fall in the FD view contain information on Xmax that can be reliably reconstructed. Shower maximum must be extrapolated for events with Xmax outside the field of view of the detector, which creates a systematic dependence on the fitting function. The PRA method is a model and detector independent approach to removing these events, by fitting shower profiles to a set of triangles and applying limits on the allowable geometry.
Najdeno v: ključnih besedah
Povzetek najdenega: ...pattern recognition analysis (PRA) method for fluorescence detectors (FD) has been developed which significantly improves...
Ključne besede: UHECR, cosmic rays, fluorescence detector, track finding, pattern recognition
Objavljeno: 29.04.2020; Ogledov: 336; Prenosov: 34
.pdf Polno besedilo (1,59 MB)

24.
Gamma Ray Showers Observed at Ground Level in Coincidence With Downward Lightning Leaders
J. P. Lundquist, R.U. Abbasi, 2018, izvirni znanstveni članek

Opis: Bursts of gamma ray showers have been observed in coincidence with downward propagating negative leaders in lightning flashes by the Telescope Array Surface Detector (TASD). The TASD is a 700‐km^2 cosmic ray observatory located in southwestern Utah, USA. In data collected between 2014 and 2016, correlated observations showing the structure and temporal development of three shower‐producing flashes were obtained with a 3‐D lightning mapping array, and electric field change measurements were obtained for an additional seven flashes, in both cases colocated with the TASD. National Lightning Detection Network information was also used throughout. The showers arrived in a sequence of 2–5 short‐duration (≤10 μs) bursts over time intervals of several hundred microseconds and originated at an altitude of ≃3–5 km above ground level during the first 1–2 ms of downward negative leader breakdown at the beginning of cloud‐to‐ground lightning flashes. The shower footprints, associated waveforms and the effect of atmospheric propagation indicate that the showers consist primarily of downward‐beamed gamma radiation. This has been supported by GEANT simulation studies, which indicate primary source fluxes of ≃10^12–10^14 photons for 16° half‐angle beams. We conclude that the showers are terrestrial gamma ray flashes, similar to those observed by satellites, but that the ground‐based observations are more representative of the temporal source activity and are also more sensitive than satellite observations, which detect only the most powerful terrestrial gamma ray flashes.
Najdeno v: ključnih besedah
Povzetek najdenega: ...lightning flashes by the Telescope Array Surface Detector (TASD). The TASD is a 700‐km^2 cosmic...
Ključne besede: gamma rays, lightning, gamma ray bursts, surface detector
Objavljeno: 30.04.2020; Ogledov: 438; Prenosov: 0
.pdf Polno besedilo (1,14 MB)

25.
Search for EeV protons of galactic origin
J. P. Lundquist, R.U. Abbasi, 2016, izvirni znanstveni članek

Opis: Cosmic rays in the energy range 10^18.0–10^18.5 eV are thought to have a light, probably protonic, composition. To study their origin one can search for anisotropy in their arrival directions. Extragalactic cosmic rays should be isotropic, but galactic cosmic rays of this type should be seen mostly along the galactic plane, and there should be a shortage of events coming from directions near the galactic anticenter. This is due to the fact that, under the influence of the galactic magnetic field, the transition from ballistic to diffusive behavior is well advanced, and this qualitative picture persists over the whole energy range. Guided by models of the galactic magnetic field that indicate that the enhancement along the galactic plane should have a standard deviation of about 20° in galactic latitude, and the deficit in the galactic anticenter direction should have a standard deviation of about 50° in galactic longitude, we use the data of the Telescope Array surface detector in 10^18.0 to 10^18.5 eV energy range to search for these effects. The data are isotropic. Neither an enhancement along the galactic plane nor a deficit in the galactic anticenter direction is found. Using these data we place an upper limit on the fraction of EeV cosmic rays of galactic origin at 1.3% at 95% confidence level.
Najdeno v: ključnih besedah
Povzetek najdenega: ...the data of the Telescope Array surface detector in 10^18.0 to 10^18.5 eV energy range...
Ključne besede: Cosmic ray, Galactic protons, Telescope array, Surface detector
Objavljeno: 30.04.2020; Ogledov: 350; Prenosov: 0
.pdf Polno besedilo (840,97 KB)

26.
CORSIKA Simulation of the Telescope Array Surface Detector
J. P. Lundquist, T. Abu-Zayyad, 2014, izvirni znanstveni članek

Opis: The Telescope Array is the largest experiment studying ultra-high energy cosmic rays in the northern hemisphere. The detection area of the experiment consists of an array of 507 surface detectors, and a fluorescence detector divided into three sites at the periphery. The viewing directions of the 38 fluorescence telescopes point over the air space above the surface array. In this paper, we describe a technique that we have developed for simulating the response of the array of surface detectors of the Telescope Array experiment. The two primary components of this method are (a) the generation of a detailed CORSIKA Monte Carlo simulation with all known characteristics of the data, and (b) the validation of the simulation by a direct comparison with the Telescope Array surface detector data. This technique allows us to make a very accurate calculation of the acceptance of the array. We also describe a study of systematic uncertainties in this acceptance calculation.
Najdeno v: ključnih besedah
Ključne besede: cosmic ray, extensive air shower, simulation, surface detector
Objavljeno: 19.05.2020; Ogledov: 260; Prenosov: 0
.pdf Polno besedilo (534,39 KB)

27.
Test benches for the upgrade of the Pierre AugerObservatory electronics
Lukas Zehrer, Marko Zavrtanik, Danilo Zavrtanik, Lili Yang, Serguei Vorobiov, Marta Trini, Samo Stanič, Gašper Kukec Mezek, Andrej Filipčič, Martina Boháčová, 2019, objavljeni znanstveni prispevek na konferenci

Najdeno v: ključnih besedah
Povzetek najdenega: ...Pierre Auger Observatory, surface detector station, electronics, test benches...
Ključne besede: Pierre Auger Observatory, surface detector station, electronics, test benches
Objavljeno: 16.06.2020; Ogledov: 252; Prenosov: 13
.pdf Polno besedilo (735,82 KB)

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New Electronics for the Surface Detectors of the Pierre Auger Observatory
Lukas Zehrer, Marko Zavrtanik, Danilo Zavrtanik, Lili Yang, Serguei Vorobiov, Marta Trini, Samo Stanič, Gašper Kukec Mezek, Andrej Filipčič, D. Nitz, 2019, objavljeni znanstveni prispevek na konferenci

Najdeno v: ključnih besedah
Povzetek najdenega: ...energy cosmic rays, Pierre Auger Observatory, AugerPrime detector upgrade, Auger Surface Detectors, electronics...
Ključne besede: ultra-high energy cosmic rays, Pierre Auger Observatory, AugerPrime detector upgrade, Auger Surface Detectors, electronics
Objavljeno: 24.07.2020; Ogledov: 198; Prenosov: 9
.pdf Polno besedilo (7,57 MB)

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