scholarly journals Latest results of ultra-high-energy cosmic ray measurements with prototypes of the Fluorescence detector Array of Single-pixel Telescopes (FAST)

2021 ◽  
Author(s):  
Toshihiro Fujii ◽  
Justin Albury ◽  
Jose Bellido ◽  
Ladislav Chytka ◽  
John Farmer ◽  
...  
Keyword(s):  
Cosmic Ray ◽  
High Energy ◽  
Detector Array ◽  
Ultra High Energy ◽  
Fluorescence Detector ◽  
Single Pixel

scholarly journals Measurements of UHECR Mass Composition by Telescope Array

2019 ◽  
Vol 210 ◽  
pp. 01008
Author(s):  
William Hanlon
Keyword(s):  
Monte Carlo ◽  
Cosmic Ray ◽  
High Energy ◽  
Mass Composition ◽  
Ultra High Energy ◽  
Fluorescence Detector ◽  
Telescope Array ◽  
Second Moments ◽  
Systematic Uncertainties ◽  
Surface Detector

Telescope Array (TA) has recently published results of nearly nine years of Xmax observations providing its highest statistics measurement of ultra high energy cosmic ray (UHECR) mass composition to date for energies exceeding 1018.2 eV. This analysis measured agreement of observed data with results expected for four different single elements. Instead of relying only on the first and second moments of Xmax distributions, we employ a morphological test of agreement between data and Monte Carlo to allow for systematic uncertainties in data and in current UHECR hadronic models. Results of this latest analysis and implications of UHECR composition observed by TA are presented. TA can utilize different analysis methods to understand composition as both a crosscheck on results and as a tool to understand systematics affecting Xmax measurements. The different analysis efforts utilizing fluorescence detector stereo, surface detector and fluorescence detector hybrid, and surface detector-only, currently underway at TA performed to understand composition are also discussed.

scholarly journals Measurement of the cosmic ray spectrum with the Pierre Auger Observatory

2019 ◽  
Vol 209 ◽  
pp. 01029
Author(s):  
Daniela Mockler
Keyword(s):  
Cosmic Rays ◽  
Cosmic Ray ◽  
High Energy ◽  
Pierre Auger Observatory ◽  
Detector Array ◽  
Data Sets ◽  
Fluorescence Detector ◽  
High Energy Cosmic Rays ◽  
Systematic Uncertainties ◽  
Surface Detector

The flux of ultra-high energy cosmic rays above 3×1017 eV has been measured with unprecedented precision at the Pierre Auger Observatory. The flux of the cosmic rays is determined by four different measurements. The surface detector array provides three data sets, two formed by dividing the data into two zenith angle ranges, and one obtained from a nested, denser detector array. The fourth measurement is obtained with the fluorescence detector. By combing all four data sets, the all-sky flux of cosmic rays is determined. The spectral features are discussed in detail and systematic uncertainties are addressed.

scholarly journals Simulation of the optical performance of the Fluorescence detector Array of Single-pixel Telescopes

2019 ◽  
Vol 210 ◽  
pp. 05014
Author(s):  
Miroslav Pech ◽  
Justin Albury ◽  
Jose A. Bellido ◽  
John Farmer ◽  
Toshihiro Fujii ◽  
...  
Keyword(s):  
Low Cost ◽  
High Energy ◽  
Detector Array ◽  
Large Field ◽  
Spherical Mirror ◽  
Optical Performance ◽  
Large Area ◽  
Fluorescence Detector ◽  
High Energy Cosmic Rays ◽  
Single Pixel

The Fluorescence detector Array of Single-pixel Telescopes (FAST) is a proposed large-area, next-generation experiment for the detection of ultra-high energy cosmic rays via the atmospheric fluorescence technique. The telescope’s large field-of-view (30 ×30) is imaged by four 200 mm photomultiplier-tubes at the focal plane of a segmented spherical mirror of 1.6 m diameter. Two prototypes are installed and taking data at the Black Rock Mesa site of the Telescope Array experiment in central Utah, USA. We present the process used for optimization of the optical performance of this compact and low-cost telescope, which is based on a simulation of the telescope’s optical point spread function.

scholarly journals TA Anisotropy Summary

2019 ◽  
Vol 210 ◽  
pp. 01004 ◽  
Author(s):  
K. Kawata ◽  
A. di Matteo ◽  
T. Fujii ◽  
D. Ivanov ◽  
C.C.H. Jui ◽  
...  
Keyword(s):  
Northern Hemisphere ◽  
Cosmic Ray ◽  
High Energy ◽  
Ultra High Energy ◽  
Fluorescence Detector ◽  
Telescope Array ◽  
Directional Anisotropy

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 km2 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.

scholarly journals Detection of ultra-high energy cosmic ray showers with a single-pixel fluorescence telescope

2016 ◽  
Vol 74 ◽  
pp. 64-72 ◽  
Author(s):  
T. Fujii ◽  
M. Malacari ◽  
M. Bertaina ◽  
M. Casolino ◽  
B. Dawson ◽  
...  
Keyword(s):  
Cosmic Ray ◽  
High Energy ◽  
Ultra High Energy ◽  
Single Pixel

scholarly journals High energy cosmic ray interactions and UHECR composition problem

2019 ◽  
Vol 210 ◽  
pp. 02001
Author(s):  
Sergey Ostapchenko
Keyword(s):  
Experimental Data ◽  
Monte Carlo ◽  
Cosmic Rays ◽  
Cosmic Ray ◽  
High Energy ◽  
Ultra High Energy ◽  
Hadronic Interactions ◽  
High Energy Cosmic Rays ◽  
Cosmic Ray Interactions ◽  
Composition Problem

The differences between contemporary Monte Carlo generators of high energy hadronic interactions are discussed and their impact on the interpretation of experimental data on ultra-high energy cosmic rays (UHECRs) is studied. Key directions for further model improvements are outlined. The prospect for a coherent interpretation of the data in terms of the UHECR composition is investigated.

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