Ground-based EAS array and ANI calorimeter


CURRENT RESULTS (2007-2009)

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). Submitted to the 31-th International Cosmic Ray Conference, Lodz, Poland (2009).


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).


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, 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:0706.4087 [astro-ph].




PRELIMINARY DATA (2005)

S.V. Ter-Antonyan, R.M. Martirosov, A.P. Garyaka, V. Eganov, N. Nikolskaya, T. Episkoposyan, J. Procureur, Y. Gallant, L. Jones: "Primary Energy Spectra and Elemental Composition. GAMMA Experiment".
astro-ph/0506588 (2005).  and



S.V. Ter-Antonyan, Y.A. Gallant, A.P. Garyaka, L.W. Jones, R.M.Martirosov, N.M. Nikolskaya, J. Procureur: "All-particle primary energy spectrum in the knee region". Proceedings 29th ICRC, Pune, India, (2005). 



GAMMA-2004 Results


Unique results of GAMMA Experiment: 15% accuracy of primary energy determination has been attained using 6-parametric fits:
Ln(E)=a1LnNch+a2s1/2/cos(t)+a3cos(t)+a4+a5/(LnNch+a6LnNm)
where Nch is the EAS size, Nm is a truncated (R<50m) number of EAS muons with energies Em>5 GeV, s is the EAS age parameter and t is the zenith angle of shower core (workshop GAMMA2004).



Investigation of the High Energy Galactic Gamma Rays flux by the GAMMA Detector
Determination of Gamma Showers and Selection Efficiency

Gamma detector distinctly sees the high energy Galactic gamma rays at energy ~1014-1015eV
with frequency ~10-3 EAS-1 and C.L. 99%. (presented to the GAMMA workshop 2004)