Physics of Particles and Nuclei Letters

, Volume 8, Issue 8, pp 851-854

First online:

Proton-nucleus inelastic cross section at ultra high energy

  • Takeshi KodamaAffiliated withInstituto de Física, Universidade Federal do Rio de Janeiro
  • , Licínio PortugalAffiliated withInstituto de Física, Universidade Federal Fluminense

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Energy dependence of proton-nucleus reaction cross section at very high energy is discussed. It is stressed that depending on the gluon distribution near the nuclear surface, proton-nucleous total cross section increases much more rapidly compared to the usual Glauber independent nucleon estimate. The recent observation of smaller X max than the expected value at UHECR domain can be an indication for such a mechanism.