The primary energy spectrum derived from Linsley method with simulations of heavy compositions in the LAAS mini array observation

Hiroki Matsumoto , Atsushi Iyono , Kazuhide Okei , Shuhei Tsuji , Soji Ohara , Nobuaki Ochi, Nobusuke Takahashi , Isao Yamamoto , Takao Nakatsuka, Saya Yamamoto

EAS, Linsley method
The primary energy and its spectrum are obtained by using compact Extensive Air Shower
(EAS) arrays, the apparatus for restricting the EAS zenith angle, and the Linsley method. In
this work, we carried out the simulation and the data analysis by taking into account of proton
and iron primaries. The primary spectral indices α (proton) and α (iron) are obtained as
α (proton) = ?2.47 ± 0.17 and α (iron) = ?3.38 ± 0.25, respectively, in the single observation
of a compact EAS array, in the primary energy region of 1016eV to 1018.5
eV. Additionally,
α (proton) = ?3.12 ± 0.13 and α (iron) = ?3.52 ± 0.17 are obtained with each composition in
the synchronized observation between the compact EAS array and the apparatus for restricting
the EAS zenith angle in the same primary energy region.
The 34th International Cosmic Ray Conference

Proceedings of Science

POS

ICRC2015

257

264