Indications of proton-dominated cosmic-ray composition above 1.6 EeV

R. U. Abbasi (Avtor), T. Abu-Zayyad (Avtor), M. Al-Seady (Avtor), M. Allen (Avtor), J. F. Amman (Avtor), R. Anderson (Avtor), G. Archbold (Avtor), K. Belov (Avtor), J. W. Belz (Avtor), D. R. Bergman (Avtor), S. A. Blake (Avtor), J. P. Lundquist (Avtor)

Povzetek

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.

Ključne besede

cosmic rays;energy spectrum;telescope array;ultra high energy;

Podatki

Jezik:	Angleški jezik
Leto izida:	2010
Tipologija:	1.01 - Izvirni znanstveni članek
Organizacija:	UNG - Univerza v Novi Gorici
UDK:	524
COBISS:	12843779
ISSN:	0031-9007
Št. ogledov:	2063
Št. prenosov:	0
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

URN:	URN:SI:UNG
Vrsta dela (COBISS):	Delo ni kategorizirano
Strani:	str. 161101-1- 161101-5
Zvezek:	ǂVol. ǂ104
Čas izdaje:	Apr. 2010
DOI:	10.1103/PhysRevLett.104.161101
ID:	11591950