Propagation of Ultra High Energy Cosmic Rays and the Production of Cosmogenic Neutrinos

Abstract

We present an updated version of the SimProp Monte Carlo code to study the propagation of ultra high energy cosmic rays in astrophysical backgrounds computing the cosmogenic neutrino fluxes expected on earth. The study of secondary neutrinos provides a powerful tool to constrain the source models of these extremely energetic particles. We will show how the newly detected IceCube neutrino events at PeV energies together with the the latest experimental results of the Pierre Auger Observatory and Telescope Array experiment are almost at the level of excluding several hypothesis on the astrophysical sources of ultra high energy cosmic rays. Results presented here can be also used to evaluate the discovery capabilities of future high energy cosmic rays and neutrino detectors.

河外极高能宇宙线的起源

“…但是要注意的是, 在计算强演化源产生的中微子 流量时, 注入的宇宙线被假设为纯质子, 并且宇宙线 的总流量是用第二膝处的流量定标的. 如果宇宙线 的成份中掺杂了一部分更重的原子核 [99] , 或者河内 与河外宇宙线的转折从踝区开始, 对应的中微子流 量会有所下降. 因此强演化源的模型也并未完全被 排除.…”