Proton Fraction in PCR Mass Composition at Energies of 10^15-10^17 eV (Experiment {\guillemotleft}Pamir{\guillemotright})

E.A.Kanevskaya; J.Kempa; R.A.Mukhamedshin; S.A.Slavatinsky; S.E.Pyatovsky; V.M.Maximenko; V.S.Puchkov; Z.M.Guseva

arxiv: 1804.11202 · v1 · pith:C65W4B2Ynew · submitted 2018-04-26 · 🌌 astro-ph.HE · hep-ex· physics.ins-det· physics.space-ph

Proton Fraction in PCR Mass Composition at Energies of 10¹5-10¹7 eV (Experiment {guillemotleft}Pamir{guillemotright})

Z.M.Guseva , E.A.Kanevskaya , J.Kempa , V.M.Maximenko , R.A.Mukhamedshin , S.E.Pyatovsky , V.S.Puchkov , S.A.Slavatinsky This is my paper

classification 🌌 astro-ph.HE hep-exphysics.ins-detphysics.space-ph

keywords compositionmassfractionalpha-particlesanalyzedassumptionsatomicchanges

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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.

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Proton Fraction in PCR Mass Composition at Energies of 10¹5-10¹7 eV (Experiment {guillemotleft}Pamir{guillemotright})

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