| Full text | |
| Author(s): |
Total Authors: 2
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| Affiliation: | [1] Univ Sao Paulo, Inst Fis Sao Carlos, Av Trabalhadar Sao Carlense 400, Sao Carlos, SP - Brazil
Total Affiliations: 1
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| Document type: | Journal article |
| Source: | Astroparticle Physics; v. 116, MAR 2020. |
| Web of Science Citations: | 1 |
| Abstract | |
The distribution of depth in which a cosmic ray air shower reaches its maximum number of particles (X-max) is studied and parametrized. Three functions are studied for proton, carbon, silicon, and iron primary particles with energies ranging from 10(17 )eV to 10(20) eV for three hadronic interaction models: EPOS-LHC, QGSJETII.04, and SJBYLL2.3c. The function which best describes the X-max distribution of a mixed composition is also studied. A very large number of simulated showers and a detailed analysis procedure are used to guarantee negligible effects of undersampling and of fitting in the final results. For the first time, a comparison of several functions is presented under the same assumption with the intention of selecting within them the best functional form to describe the X-max distribution. The Generalized Gumbel distribution is shown to be the best option among the options for a general description of all cases. The Log-normal distribution is also a good choice for some cases while the Exponentially Modified Gaussian distribution has shown to be the worst choice in almost all cases studied. All three functions are parametrized as a function of energy and primary mass. (C) 2019 Elsevier B.V. All rights reserved. (AU) | |
| FAPESP's process: | 15/15897-1 - Cherenkov Telescope Array - CTA |
| Grantee: | Luiz Vitor de Souza Filho |
| Support Opportunities: | Research Projects - Thematic Grants |