Constraints on the fraction of primary gamma rays at ultra-high energies from the muon data of the Yakutsk EAS array

被引：34
|
作者：
Glushkov, A. V. [1 ]
Gorbunov, D. S.
Makarov, I. T.
Pravdin, M. I.
Rubtsov, G. I.
Sleptsov, I. E.
Troitsky, S. V.
机构：
[1] Yakutsk EAS Array Collaborat, Shafer Inst Cosmophys Res & Aeron, Yakutsk 677980, Russia
[2] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia
[3] Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119992, Russia
来源：
JETP LETTERS | 2007年 / 85卷 / 03期
基金：
俄罗斯基础研究基金会;
关键词：
D O I：
10.1134/S0021364007030010
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
By using data on the total signal and on the muon component of air showers detected at the Yakutsk array, the possible upper limits on the fraction of primary gamma rays at ultra-high energies is analyzed in the framework of the recently suggested event-by-event approach. Upper limits on the photon fraction in the integral flux of primary cosmic rays are derived. At 95% C.L., these limits are 22% for primary energies E-0 > 4 x 10(19) eV and 12% for E-0 > 2 x 10(19) eV. Despite the presence of muonless events, the data are consistent with the complete absence of photons at least at 95% C.L. The sensitivity of the results to systematic uncertainties, in particular to those of the energy determination for nonphoton primaries, is discussed.
引用
收藏
页码：131 / 135
页数：5
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