A Study of the Composition of Ultra–High‐Energy Cosmic Rays Using the High‐Resolution Fly’s Eye | Zendy

Rasha Abbasi | Zendy; T. AbuZayyad | Zendy; G. Archbold | Zendy; R. Atkins | Zendy; Jose A. Bellido | Zendy; K. Belov | Zendy; J. W. Belz | Zendy; S. BenZvi | Zendy; D. R. Bergman | Zendy; J. Boyer | Zendy; G. W. Burt | Zendy; Zhen Cao | Zendy; R. W. Clay | Zendy; B. Connolly | Zendy; B. R. Dawson | Zendy; Wenyu Deng | Zendy; Y. Fedorova | Zendy; J. Findlay | Zendy; C. Finley | Zendy; W. Hanlon | Zendy; G.A. Hughes | Zendy; P. Hüntemeyer | Zendy; C. C. H. Jui | Zendy; K. Kim | Zendy; M. Kirn | Zendy; B. Knapp | Zendy; E. C. Loh | Zendy; M. M. Maetas | Zendy; K. Martens | Zendy; M. Grünewald | Zendy; Naohiro Manago | Zendy; E. J. Mannel | Zendy; J. A. J. Matthews | Zendy; J. N. Matthews | Zendy; A. O’Neill | Zendy; L. Perera | Zendy; K. Reil | Zendy; R. Riehle | Zendy; M. S. Roberts | Zendy; M. Sasaki | Zendy; M. Seman | Zendy; S. Schnetzer | Zendy; K. M. Simpson | Zendy; J. D. Smith | Zendy; R. Snow | Zendy; P. Sokolsky | Zendy; C. Song | Zendy; R. W. Springer | Zendy; B. T. Stokes | Zendy; J. R. Thomas | Zendy; S. B. Thomas | Zendy; G. B. Thomson | Zendy; S. Westerhoff | Zendy; L. R. Wiencke | Zendy; A. Zech | Zendy

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A Study of the Composition of Ultra–High‐Energy Cosmic Rays Using the High‐Resolution Fly’s Eye

Author(s) -

Rasha Abbasi,

T. AbuZayyad,

G. Archbold,

R. Atkins,

Jose A. Bellido,

K. Belov,

J. W. Belz,

S. BenZvi,

D. R. Bergman,

J. Boyer,

G. W. Burt,

Zhen Cao,

R. W. Clay,

B. Connolly,

B. R. Dawson,

Wenyu Deng,

Y. Fedorova,

J. Findlay,

C. Finley,

W. Hanlon,

G.A. Hughes,

P. Hüntemeyer,

C. C. H. Jui,

K. Kim,

M. Kirn,

B. Knapp,

E. C. Loh,

M. M. Maetas,

K. Martens,

M. Grünewald,

Naohiro Manago,

E. J. Mannel,

J. A. J. Matthews,

J. N. Matthews,

A. O’Neill,

L. Perera,

K. Reil,

R. Riehle,

M. S. Roberts,

M. Sasaki,

M. Seman,

S. Schnetzer,

K. M. Simpson,

J. D. Smith,

R. Snow,

P. Sokolsky,

C. Song,

R. W. Springer,

B. T. Stokes,

J. R. Thomas,

S. B. Thomas,

G. B. Thomson,

S. Westerhoff,

L. R. Wiencke,

A. Zech

Publication year - 2005

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/427931

Subject(s) - cosmic ray , physics , monte carlo method , elongation , resolution (logic) , detector , observatory , nuclear physics , hadron , proton , astrophysics , optics , materials science , statistics , mathematics , artificial intelligence , computer science , metallurgy , ultimate tensile strength

The composition of Ultra High Energy Cosmic Rays (UHECR) is measured with theHigh Resolution Fly's Eye cosmic ray observatory (HiRes) data using the Xmaxtechnique. Data were collected in stereo between 1999 November and 2001September. The data are reconstructed with well-determined geometry.Measurements of the atmospheric transmission are incorporated in thereconstruction. The detector resolution is found to be 30 g cm^-2 in Xmax and13% in Energy. The Xmax elongation rate between 10^18.0 eV and 10^19.4 eV ismeasured to be 54.5 +/- 6.5 (stat) +/- 4.5 (sys) g cm^-2 per decade. This iscompared to predictions using the QGSJet01 and SIBYLL 2.1 hadronic interactionmodels for both protons and iron nuclei. CORSIKA-generated Extensive AirShowers (EAS) are incorporated directly into a detailed detector Monte Carloprogram. The elongation rate and the Xmax distribution widths are consistentwith a constant or slowly changing and predominantly light composition. Asimple model containing only protons and iron nuclei is compared to QGSJet andSIBYLL. The best agreement between the model and the data is at 80% protons forQGSJet and 60% protons for SIBYLL.Comment: 52 pages, 27 figures. Revised Fig. 10 caption, improved Fig. 23, resubmitted to ApJ. (Previously revised to address referee's comments.) (Originally 37 pages, 13 figures. Submitted to ApJ

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