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Featured researches published by X. X. Zhou.


Astroparticle Physics | 2007

Moon shadow by cosmic rays under the influence of geomagnetic field and search for antiprotons at multi-TeV energies

M. Amenomori; S. Ayabe; X. J. Bi; D. Chen; Shuwang Cui; Danzengluobu; L. K. Ding; X. H. Ding; C. Feng; Zhaoyang Feng; Z. Y. Feng; X. Y. Gao; Q. X. Geng; H. W. Guo; H. H. He; M. He; K. Hibino; N. Hotta; Haibing Hu; H. B. Hu; J. Huang; Q. Huang; H. Y. Jia; F. Kajino; K. Kasahara; Y. Katayose; C. Kato; K. Kawata; Labaciren; G. M. Le

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.


Advances in Space Research | 2008

The energy spectrum of all-particle cosmic rays around the knee region observed with the Tibet-III air-shower array

M. Amenomori; S. Ayabe; X. J. Bi; D. Chen; S. W. Cui; Danzengluobu; L. K. Ding; X. H. Ding; C. F. Feng; Zhaoyang Feng; Z. Y. Feng; X. Y. Gao; Q. X. Geng; H. W. Guo; H. H. He; M. He; K. Hibino; N. Hotta; Haibing Hu; H. B. Hu; J. Huang; Q. Huang; H. Y. Jia; F. Kajino; K. Kasahara; Y. Katayose; C. Kato; K. Kawata; Labaciren; G. M. Le

We have already reported the first result on the all-particle spectrum around the knee region based on data from 2000 November to 2001 October observed by the Tibet-III air-shower array. In this paper, we present an updated result using data set collected in the period from 2000 November through 2004 October in a wide range over 3 decades between 1014 and 1017 eV, in which the position of the knee is clearly seen at around 4 PeV. The spectral index is 2.68 ± 0.02(stat.) below 1 PeV, while it is 3.12 ± 0.01(stat.) above 4 PeV in the case of QGSJET+HD model, and various systematic errors should be carefully done in the very near future.


Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1993

The LVD tracking system chambers

G. Anzivino; P. Benvenuto; S. Bianco; R. Casaccia; B. Dulach; D. Fabbri; F. Fabbri; M. Gatta; M. Giardoni; I. Laakso; M. Lindozzi; L. Passamonti; V. Russo; S. Sarwar; G. Sensolini; M. Ventura; L. Votano; A. Zallo; D. Mencarini; E. Pallante; Z. Aftab; Mab Ali; R. Chen; Shuang Cong; X. Cui; H. Ding; B. Gao; Y. Li; L. Lu; B.K. Minhas

ICSCWorldLaboratory, Lausanne, SwitzerlandReceived5 November 19921. IntroductionThe LVDdetector[11 can be defined as an under-groundobservatory with the main objectives of study-ing neutrinos from stellar collapse and searching forpoint-like sources of gammas and neutrinos of veryhigh energy. This multipurpose apparatus is being in-stalled in hall Aofthe Gran Sasso Laboratory [21 at avertical depth of 3600 m.w.e. It consists of a largevolume of liquid scintillator divided into modules andofa tracking system madeof layers ofstreamertubes.The detectordesignfulfils the following aims:- the study ofthe neutrino interactions inside thedetectorwithenergymeasurementfor low-energyneu-trino interactions, and patternidentification for higherenergyevents;- the detectionofpassing muonswith track recon-struction, up-down discrimination and time of flightmeasurement.The apparatus consists of 190 basically identicalmodules. Each module comprises 9.6 t ofliquid scintil-lator divided into eight modular counters and an L-shaped tracking chamber, containing adouble layer ofstreamer tubes andfacingthe bottom andone verticalside ofthemodule. Thesemodules areinserted into an0168-9002/93/


Advances in Space Research | 2011

Cosmic-ray energy spectrum around the knee obtained by the Tibet experiment and future prospects

M. Amenomori; X. J. Bi; D. Chen; S. W. Cui; Danzengluobu; L. K. Ding; X. H. Ding; C. Fan; C. F. Feng; Zhaoyang Feng; Z. Y. Feng; X. Y. Gao; Q. X. Geng; H. W. Guo; H. H. He; M. He; K. Hibino; N. Hotta; Haibing Hu; H. B. Hu; J. Huang; Q. Huang; H. Y. Jia; F. Kajino; K. Kasahara; Y. Katayose; C. Kato; K. Kawata; Labaciren; G. M. Le

06.00 0 1993 -Elsevier Science Publishers B.V. All rights reservediron support structure. The whole array, which mea-sures 40X 12


Nuclear Physics B - Proceedings Supplements | 2008

The cosmic-ray energy spectrum around the knee measured by the Tibet-III air-shower array

M. Amenomori; S. Ayabe; X. J. Bi; D. Chen; S. W. Cui; Danzengluobu; L. K. Ding; X. H. Ding; C. F. Feng; Zhaoyang Feng; Z. Y. Feng; X. Y. Gao; Q. X. Geng; H. W. Guo; H. H. He; M. He; K. Hibino; N. Hotta; Haibing Hu; H. B. Hu; J. Huang; Q. Huang; H. Y. Jia; F. Kajino; K. Kasahara; Y. Katayose; C. Kato; K. Kawata; Labaciren; G. M. Le


29th International Cosmic Ray Conference, ICRC 2005 | 2005

Two dimensional observation on TeV Cosmic-ray large scale anisotropy using the Tibet Air Shower Array

M. Amenomori; S. Ayabe; D. Chen; S. W. Cui; Danzengluobu; L. K. Ding; X. H. Ding; C. F. Feng; Z. Y. Feng; X. Y. Gao; Q. X. Geng; H. W. Guo; H. H. He; M. He; K. Hibino; N. Hotta; Haibing Hu; H. B. Hu; J. Huang; Q. Huang; H. Y. Jia; F. Kajino; K. Kasahara; Y. Katayose; C. Kato; K. Kawata; Labaciren; G. M. Le; J. Y. Li; H. Lu


Nuclear Physics B - Proceedings Supplements | 2008

Northern Sky Survey for Gamma-ray Point Sources in 100 TeV Region with the Tibet Air Shower Array

M. Amenomori; S. Ayabe; X. J. Bi; D. Chen; S. W. Cui; Danzengluobu; L. K. Ding; X. H. Ding; C. F. Feng; Zhaoyang Feng; Z. Y. Feng; X. Y. Gao; Q. X. Geng; H. W. Guo; H. H. He; M. He; K. Hibino; N. Hotta; Haibing Hu; H. B. Hu; J. Huang; Q. Huang; H. Y. Jia; F. Kajino; K. Kasahara; Y. Katayose; C. Kato; K. Kawata; Labaciren; G. M. Le


29th International Cosmic Ray Conference, ICRC 2005 | 2005

Multiwavelength searches of the Shell-like SNR G40.5-0.5

M. Amenomori; S. Ayabe; D. Chen; S. W. Cui; Danzengluobu; L. K. Ding; X. H. Ding; C. F. Feng; Z. Y. Feng; X. Y. Gao; Q. X. Geng; H. W. Guo; H. H. He; M. He; K. Hibino; N. Hotta; Haibing Hu; H. B. Hu; J. Huang; Q. Huang; H. Y. Jia; F. Kajino; K. Kasahara; Y. Katayose; C. Kato; K. Kawata; Labaciren; G. M. Le; J. Y. Li; H. Lu


Nuclear Physics B - Proceedings Supplements | 2008

Spectral index of high-energy cosmic rays by the Compton-Getting effect at solar time frame with the Tibet air shower array

M. Amenomori; S. Ayabe; X. J. Bi; D. Chen; S. W. Cui; Danzengluobu; L. K. Ding; X. H. Ding; C. F. Feng; Zhaoyang Feng; Z. Y. Feng; X. Y. Gao; Q. X. Geng; H. W. Guo; H. H. He; M. He; K. Hibino; N. Hotta; Haibing Hu; H. B. Hu; J. Huang; Q. Huang; H. Y. Jia; F. Kajino; K. Kasahara; Y. Katayose; C. Kato; K. Kawata; Labaciren; G. M. Le


Nuclear Physics B - Proceedings Supplements | 2008

A large underground water Cherenkov muon detector array with the Tibet air shower array for Gamma-ray astronomy in the 100 TeV region: detector design and simulation

M. Amenomori; S. Ayabe; X. J. Bi; D. Chen; S. W. Cui; Danzengluobu; L. K. Ding; X. H. Ding; C. F. Feng; Zhaoyang Feng; Z. Y. Feng; X. Y. Gao; Q. X. Geng; H. W. Guo; H. H. He; M. He; K. Hibino; N. Hotta; Haibing Hu; H. B. Hu; J. Huang; Q. Huang; H. Y. Jia; F. Kajino; K. Kasahara; Y. Katayose; C. Kato; K. Kawata; Labaciren; G. M. Le

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K. Kasahara

Shibaura Institute of Technology

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N. Hotta

Utsunomiya University

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Y. Katayose

Yokohama National University

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G. M. Le

Chinese Academy of Sciences

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H. B. Hu

Chinese Academy of Sciences

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