1.6 EeV以上宇宙线成分以质子为主的迹象
高能天体物理现象
2010-04-29 v2
摘要
我们报告了通过分析高分辨蝇眼（HiRes）观测站收集的空气簇射事件的空气簇射最大深度（Xmax），对超高能宇宙线成分的研究。HiRes数据在1.6 EeV至63 EeV的能量范围内，与常数伸长率d<Xmax>/d(log(E)) = 47.9 +- 6.0（统计）+- 3.2（系统）g/cm^2/decade一致，并且当通过QGSJET01和QGSJET-II高能强子相互作用模型解释时，与宇宙线成分以质子为主一致。这些测量限制了那些认为银河系-河外过渡是4 EeV处能谱“踝”成因的模型。
引用
@article{arxiv.0910.4184,
title = {Indications of Proton-Dominated Cosmic Ray Composition above 1.6 EeV},
author = {R. U. Abbasi and T. Abu-Zayyad and M. Al-Seady and M. Allen and J. F. Amman and R. J. Anderson and G. Archbold and K. Belov and J. W. Belz and D. R. Bergman and S. A. Blake and O. A. Brusova and G. W. Burt and C. Cannon and Z. Cao and W. Deng and Y. Fedorova and C. B. Finley and R. C. Gray and W. F. Hanlon and C. M. Hoffman and M. H. Holzscheiter and G. Hughes and P. Huentemeyer and B. F Jones and C. C. H. Jui and K. Kim and M. A. Kirn and E. C. Loh and J. P. Lundquist and M. M. Maestas and N. Manago and L. J. Marek and K. Martens and J. A. J. Matthews and J. N. Matthews and S. A. Moore and A. O'Neill and C. A. Painter and L. Perera and K. Reil and R. Riehle and M. Roberts and D. Rodriguez and N. Sasaki and S. R. Schnetzer and L. M. Scott and G. Sinnis and J. D. Smith and P. Sokolsky and C. Song and R. W. Springer and B. T. Stokes and S. Stratton and S. B. Thomas and J. R. Thomas and G. B. Thomson and D. Tupa and X. Zhang and A. Zech},
journal= {arXiv preprint arXiv:0910.4184},
year = {2010}
}
备注
11 pages, 4 figures, accepted for publication in Physical Review Letters