Proton Fraction in PCR Mass Composition at Energies of 10^15-10^17 eV (Experiment «Pamir»)
Abstract
The fraction of halo events among gamma-hadron families with SUM(Egamma) > 500 TeV is analyzed. The comparison of experimental data and Monte-Carlo simulations by MC0 code of quark-gluon string model under various assumptions on the PCR mass composition suggests a slowly increasing contribution of nuclei heavier than protons and alpha-particles to PCR mass composition. Effective atomic number of PCR particles changes in the energy interval 10^15-10^17 eV so that lnA grows from 2 to 2.5.
- Publication:
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arXiv e-prints
- Pub Date:
- April 2018
- DOI:
- arXiv:
- arXiv:1804.11202
- Bibcode:
- 2018arXiv180411202G
- Keywords:
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- Astrophysics - High Energy Astrophysical Phenomena;
- High Energy Physics - Experiment;
- Physics - Instrumentation and Detectors;
- Physics - Space Physics
- E-Print:
- 28th International Cosmic Ray Conference, July 31 - August 7, 2003 Tsukuba, Japan