Study of the energy spectrum of primary cosmic rays: EAS size fluctuations at a fixed primary energy

Details Study of the energy spectrum of primary cosmic rays: EAS size fluctuations at a fixed primary energy Study of the energy spectrum of primary cosmic rays: EAS size fluctuations at a fixed primary energy

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....7..191a&link_type=abstract

In NASA Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 7 p 191-194 (SEE N85-35968 24-93)

Physics

Cerenkov Counters, Cosmic Ray Showers, Energy Spectra, Primary Cosmic Rays, Cerenkov Radiation, Charged Particles, Flux Density, Scintillation Counters

Scientific paper

During the initial period of the Samarkand EAS array operations the showers were selected on the basis of charged-particle flux density, and during the subsequent periods the showers were selected on the basis of Cerenkov light flux density. This procedure made it possible to measure the shower energy, to estimate the EAS size fluctuations at a fixed primary energy, and to experimentally obtain the scaling factor K(Ne, Eo) from the EAS size spectrum to the primary energy spectrum. Six scintillators of area S = 2 sq m each were added to the array. The fluctuations of EAS sizes in the showers of fixed primary energies and the scaling factors K(Ne, Eo) were inferred from the data obtained. The showers with zenith angles 30 deg were selected. The EAS axis positions were inferred from the amplitude data of the scintillators. The primary energy Eo was determined by the method of least squares for the known EAS axis position using the data of the Cerenkov detector located at 80 to 150 m EAS axis. It is shown that the Cerenkov light flux fluctuations at 100 m from EAS axis, q100, do not exceed 10% at a fixed EAS energy, so the parameter q100 may be used to estimate the EAS-generating primary particle-energy.

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