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Are protons still dominant at the knee of the cosmic-ray energy spectrum?
Tibet ASGamma Collaboration
2006
发表期刊PHYSICS LETTERS B
卷号632期号:1页码:58-64
通讯作者Huang, Q (reprint author), Univ Tokyo, Inst Cosm Ray Res, Kashiwa, Chiba 2778582, Japan.
摘要A hybrid experiment consisting of emulsion chambers, burst detectors and the Tibet-11 air-shower array was carried out at Yangbajing (4300 m a.s.l., 606 g/cm(2)) in Tibet to obtain the energy spectra of primary protons and heliums. From three-year operation, these energy spectra are deduced between 10(15) and 10(16) eV by triggering the air showers associated with a high energy core and using a neural network method in the primary mass separation. The proton spectrum can be expressed by a single power-law function with a differential index of -3.01 +/- 0.11 and -3.05 +/- 0.12 based on the QGSJET + HD and SIBYLL + HD models, respectively, which are steeper than that extrapolated from the direct observations of -2.74 +/- 0.01 in the energy range below 10 14 eV. The absolute fluxes of protons and heliums are derived within 30% systematic errors depending on the hadronic interaction models used in Monte Carlo simulation. The result of our experiment suggests that the main component responsible for the change of the power index of the all-particle spectrum around 3 x 1015 eV, so-called "knee", is composed of nuclei heavier than helium. This is the first measurement of the differential energy spectra of primary protons and heliums by selecting them event by event at the knee energy region. (c) 2005 Elsevier B.V. All rights reserved.
关键词SHOCK ACCELERATION HYBRID-EXPERIMENT REGION HELIUM NUCLEI TIBET
学科领域Physics
DOI10.1016/j.physletb.2005.10.048
收录类别SCI
语种英语
WOS类目Physics, Multidisciplinary
WOS记录号WOS:000234520500008
引用统计
被引频次:57[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/212634
专题粒子天体物理中心
作者单位中国科学院高能物理研究所
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Tibet ASGamma Collaboration. Are protons still dominant at the knee of the cosmic-ray energy spectrum?[J]. PHYSICS LETTERS B,2006,632(1):58-64.
APA Tibet ASGamma Collaboration.(2006).Are protons still dominant at the knee of the cosmic-ray energy spectrum?.PHYSICS LETTERS B,632(1),58-64.
MLA Tibet ASGamma Collaboration."Are protons still dominant at the knee of the cosmic-ray energy spectrum?".PHYSICS LETTERS B 632.1(2006):58-64.
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