Proton-nucleus inelastic cross section at ultra high energy
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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 Xmax than the expected value at UHECR domain can be an indication for such a mechanism.
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