Speaker
Dr
Masanobu Tamada
(Kinki University)
Description
The Chacaltaya hybrid experiment together with emulsion chamber and EAS-array
can detect air-showers by the air-shower array, the accompanied atmospheric families
(a bundle of high energy electrons and gamma-rays) by emulsion chambers and hadrons
by burst detectors just under the emulsion chambers.
We study overall characteristics of the experimental data, gamma-families and hadron burst
accompanied by air-showers, by studying various correlations between the three
observable data, i.e, between families and air-showers, between bursts and air-showers,
and between families and bursts, comparing with those of CORSIKA simulations using interaction
models of QGSJET, SIBYLL and EPOS.
The analysis shows that changes of chemical composition alone can not describe the global
characteristics of the Chacaltaya hybrid data. That is, distributions of family energies are favorable to
heavy-dominant composition of primary cosmic-rays but lateral distributions of families are
favorable to proton-dominant composition.
The Chacaltaya hybrid data are also compared with those of Tien-Shan and Tibet hybrid experiments.
There are some discrepancies among the three experimental data though the details of experimental
procedure is different.
Discussions are given on the possible reason of the disagreement by comparing these experimental data with simulations.
Primary author
Dr
Masanobu Tamada
(Kinki University)