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Moon shadow by cosmic rays under the influence of geomagnetic field and search for antiprotons at multi-TeV energies
Tibet ASγ Collaboration
2007
发表期刊ASTROPARTICLE PHYSICS
卷号28期号:1页码:#REF!
通讯作者Hibino, K (reprint author), Kanagawa Univ, Fac Engn, Yokohama, Kanagawa 2218686, Japan.
摘要We have observed the shadowing of galactic cosmic ray flux in the direction of the moon, the so-called moon shadow, using the Tibet-III air shower array operating at Yangbajing (4300 in a.s.l.) in Tibet since 1999. Almost all cosmic rays are positively charged; for that reason, they are bent by the geomagnetic field, thereby shifting the moon shadow westward. The cosmic rays will also produce an additional shadow in the eastward direction of the moon if cosmic rays contain negatively charged particles, such as antiprotons, with some fraction. We selected 1.5 x 10(10) air shower events with energy beyond about 3 TeV from the dataset observed by the Tibet-III air shower array and detected the moon shadow at similar to 40 sigma level. The center of the moon was detected in the direction away from the apparent center of the moon by 0.23 degrees to the west. Based on these data and a full Monte Carlo simulation, we searched for the existence of the shadow produced by antiprotons at the multi-TeV energy region. No evidence of the existence of antiprotons was found in this energy region. We obtained the 90% confidence level upper limit of the flux ratio of antiprotons to protons as 7% at multi-TeV energies. (C) 2007 Elsevier B.V. All rights reserved.
文章类型Article
关键词cosmic rays air shower anti-matter observation and data analysis simulations
学科领域Astronomy & Astrophysics; Physics
DOI10.1016/j.astropartphys.2007.05.002
收录类别SCI
WOS类目Astronomy & Astrophysics ; Physics, Particles & Fields
WOS记录号WOS:000250355200012
引用统计
被引频次:11[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/311005/226417
专题粒子天体物理中心
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GB/T 7714
Tibet ASγ Collaboration. Moon shadow by cosmic rays under the influence of geomagnetic field and search for antiprotons at multi-TeV energies[J]. ASTROPARTICLE PHYSICS,2007,28(1):#REF!.
APA Tibet ASγ Collaboration.(2007).Moon shadow by cosmic rays under the influence of geomagnetic field and search for antiprotons at multi-TeV energies.ASTROPARTICLE PHYSICS,28(1),#REF!.
MLA Tibet ASγ Collaboration."Moon shadow by cosmic rays under the influence of geomagnetic field and search for antiprotons at multi-TeV energies".ASTROPARTICLE PHYSICS 28.1(2007):#REF!.
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