Proton-nucleus inelastic cross section at ultra high energy |
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Authors: | Takeshi Kodama Licínio Portugal |
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Affiliation: | 1.Instituto de Física,Universidade Federal do Rio de Janeiro,Rio de Janeiro,Brasil;2.Instituto de Física,Universidade Federal Fluminense,Niterói,Brasil |
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Abstract: | 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. |
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