Study of Ultra-High Energy Cosmic Ray composition using Telescope Array's Middle Drum detector and surface array in hybrid mode

Title
Study of Ultra-High Energy Cosmic Ray composition using Telescope Array's Middle Drum detector and surface array in hybrid mode
Authors
천병구
Keywords
Ultra-High Energy Cosmic Rays; Cosmic ray composition; Atmospheric fluorescence; Extensive air shower array; Hybrid; Telescope Array
Issue Date
2015-04
Publisher
ELSEVIER SCIENCE BV
Citation
ASTROPARTICLE PHYSICS, v. 64, Page. 49-62
Abstract
Previous measurements of the composition of Ultra-High Energy Cosmic Rays (UHECRs) made by the High Resolution Fly's Eye (HiRes# and Pierre Auger Observatory #PAO# are seemingly contradictory, but utilize different detection methods, as HiRes was a stereo detector and PAO is a hybrid detector. The five year Telescope Array #TA# Middle Drum hybrid composition measurement is similar in some, but not all, respects in methodology to PAO, and good agreement is evident between data and a light, largely protonic, composition when comparing the measurements to predictions obtained with the QGSJetII-03 and QGSJet-01 c models. These models are also in agreement with previous HiRes stereo measurements, confirming the equivalence of the stereo and hybrid methods. The data is incompatible with a pure iron composition, for all models examined, over the available range of energies. The elongation rate and mean values of X-max are in good agreement with Pierre Auger Observatory data. This analysis is presented using two methods: data cuts using simple geometrical variables and a new pattern recognition technique. #C) 2014 Elsevier B.V. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S0927650514001820http://hdl.handle.net/20.500.11754/23858
ISSN
0927-6505; 1873-2852
DOI
http://dx.doi.org/10.1016/j.astropartphys.2014.11.004
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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