GAMMA Experiment     Brief description of GAMMA Experiment

  • Last publications:

    • Anatoly Erlykin, Romen Martirosov and Arnold Wolfendale, "The origin of cosmic rays", CERN Courier January-February (2011) 51 (1) p.21.

    • Romen M. Martirosov, Samvel V. Ter-Antonyan, Anatoly D. Erlykin, Alexandr P. Garyaka, Natalya M. Nikolskaya, Yves A. Gallant and Lawrence W. Jones,"Galactic diffuse gamma-ray flux at the energy about 175 TeV", arXiv:0905.3593 [astro-ph] (2009). Proceedings of 31-st International Cosmic Ray Conference, Lodz, Poland (2009).

    • R.M. Martirosov , A.P. Garyaka, S.V. Ter-Antonyan, A.D. Erlykin, N.M. Nikolskaya, Y.A. Gallant, L.W. Jones, and J. Procureur: "Does the GAMMA experiment detect the polar cap component at energies 70-80 PeV?" Nuclear Physics B 196 (2009) 173 (to get paper from our server)

    • A.P. Garyaka, R.M. Martirosov, S.V. Ter-Antonyan, A.D. Erlykin, N.M. Nikolskaya, Y.A. Gallant, L.W. Jones, J. Procureur: "Primary cosmic ray energy spectrum in terms of the GAMMA muon data", Nuclear Physics B, ISSN: 09205632, 196 (2009) 387-390/ Proceedings of the XV International Symposium on Very High Energy Cosmic Ray Interactions (ISVHECRI 2008)/

    • A.P. Garyaka, R.M. Martirosov, S.V. Ter-Antonyan, A.D. Erlykin, N. Nikolskaya, Y.A. Gallant, L. Jones, and J. Procureur: "All-particle primary energy spectrum in the 3-200 PeV energy range", Journal of Physics G: Nuclear and Particle Physics, 35 (2008) 115201. available from: http://stacks.iop.org/0954-3899/35/115201 or arXiv:0808.1421 v1 [astro-ph] (2008).

    • L.W. Jones, Y.A. Gallant, A.P. Garyaka, R.M. Martirosov, S.V. Ter-Antonyan, N.M. Nikolskaya and J. Procureur:"Future Plans for the GAMMA Array on Mt. Aragats", Nuclear Physics B V 175-176, (2008) 315. , or from our server:

    • R.M. Martirosov, S.V. Ter-Antonyan, A.P. Garyaka, N. Nikolskaya, Y.A. Gallant, L. Jones, and J. Procureur. "Energy spectra and elemental composition of primary nuclei in the knee region: Recent results from the GAMMA experiment", Nuclear Physics B, 175-176 (2008) 311.

    • A.P. Garyaka, R.M. Martirosov, S.V. Ter-Antonyan, N. Nikolskaya, Y.A. Gallant, L. Jones, J. Procureur. "Rigidity-dependent cosmic ray energy spectra in the knee region obtained with the GAMMA experiment", Astroparticle Physics, Volume 28, issue 2 (2007) p. 169 / available from:arXiv:0704.3200v1 [astro-ph].

    • S.V. Ter-Antonyan. "Mutually compensative pseudo solutions of primary energy spectra in the knee region", Astroparticle Physics 28, issue 3 (2007) p. 321 / available from:arXiv:0706.4087v1 [astro-ph].


  • HOT REFERENCES to GAMMA Experiment Database

  • GAMMA Experiment in WikipediA

  • PRESENTATIONS  (see also Workshops and ICRC):


  • Selected GAMMA Reports:

    • Primary P, He, O-like, Fe-like nuclei energy spectra in the knee region  ppt format from GAMMA server

    • All-particle primary energy spectrum in 1-200 PeV energy range  ppt format from GAMMA server

    • Pseudo solutions of cosmic ray inverse problems  ppt format from GAMMA server

  • Poster Presentations:

    • Study of structure of the primary cosmic ray energy spectrum around the knee or Does the GAMMA experiment detect the polar cap component at energies 70-80 PeV?
    21st ECRS 2008, Kosice
    Slovakia

    Primary energy spectra in the 1-100 PeV energy range: GAMMA Experiment
    20-th ECRS, Lisbon
    Portugal, Sep 5-8, 2006

    All-particle primary energy spectra in the knee region: GAMMA Experiment
    20-th ECRS, Lisbon
    Portugal, Sep 5-8, 2006

     

    GAMMA experiment is study of :

    • Galactic diffuse gamma-ray intensity at energies 1014- 1015eV;
    • Primary cosmic-ray energy spectra and elemental composition at energies 1015- 1018eV;
    • Extensive Air Showers (EAS) at the mountain level by the ground-based scintillation EAS array and underground muon scintillation carpet;
    • Hard jet productions at energies ~1016eV by the muon multi-core EAS events.

    GAMMA facility is deployed on the South side of Mount Aragats in Armenia (Cosmic Ray Observatory at the Yerevan Physics Institute, 3200m above sea level, 700g/cm2) and was established in 1986 as a part of ANI project in the frameworks of the Yerevan Physics Institute and Moscow Lebedev Physical Institute (Russia) collaboration. The ANI project has a long history of realization of the cosmic ray experiments. 3 experiments were ran (PION-EAS, MAKET-ANI and GAMMA) between 1980 and 2004 using novel approach in the investigations of EAS, such as detection of all (hadron, muon, electron-photon) high energy shower components at the observation level.

    Nowaday the GAMMA experiment is a stand-alone project in the range of High Energy Astroparticle and Cosmic-Ray Physics. For proposals and comments please visite contact page.

     

    Ground-based EAS array and ANI calorimeter

    GAMMA detector: Ground-based EAS array and Biblical Ararat (background)

    33 registration stations of EAS array are disposed on the 5 concentric circles (Rmax=100m). Each station contains 3 plastic scintillators (1x1x 0.05 m3) to detect the energy deposit of EAS charged particles and one fast-timing detector to record the time of flight of a shower front. The zenith angular accuracy is less than 1.50. EAS core coordinate reconstruction accuracy is less about 1m. The EAS size measurement errors is about 10%. Measurement range of the EAS size is 105-108 that corresponds to 0.5-100 PeV primary nuclei energy.

     


    GAMMA detector: Underground muon hall

    Underground muon hall ( under ~2500 g/cm2 of rock and concrete) includes Computer Center for experiment management, data acquisition, preliminary data processing and muon scintillation carpet  with 150 compactly arranged plastic scintillators(1x1x0.05 m3 ) to detect EAS muon component with energies more that ~5 GeV. Measurement range of EAS muon size is 103-105. Corresponding muon shower size reconstruction accuracies is about 30-20%.

     

    Voyage round GAMMA Experiment____



    North Aragats Peak.
    Elevation: 4090m and 3 mi northward GAMMA experiment

     

    Last update: 01.05.2011