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arXiv 1209.4033astro-ph.HEhep-ph
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超高能宇宙射线传播产生的PeV中微子

PeV neutrinos from the propagation of ultra-high energy cosmic rays

Esteban Roulet, Guenter Sigl, Arjen van Vliet, Silvia Mollerach

摘要:

本文讨论了IceCube最近观测到的PeV中微子是河外宇宙射线在穿过辐射背景时相互作用产生的可能性。我们发现,从宇宙射线质子与CMB背景的相互作用中产生的中子衰变产生的通量被抑制($E_ν^2$ d $Φ_ν/$ d $E< 10^{-10}$ GeV/cm $^2$ s sr),与那些从与UV/光学/IR背景的相互作用中产生的π介子衰变产生的是在PeV能量占主导地位的。由重核与CMB光子的光致衰变产生的中子衰变所产生的反中微子通量也被证明是相当抑制的($E_ν^2$ d $Φ_ν/$ d $E< 10^{-11}$ GeV/cm $^2$ s sr),而由具有UV/光学/IR背景的光子π过程产生的反中微子通量可能更大,尽管它们预计不会高于纯质子情况下可实现的通量。混合成分和低截止刚度的情况下,可以导致PeV中微子通量增强相对于那些在纯铁的情况下。我们还讨论了可能的影响,为检测这些情况下,显示出它起着温和的作用的marthow共振。

英文摘要:

We discuss the possibility that the PeV neutrinos recently observed by IceCube are produced by the interactions of extragalactic cosmic rays during their propagation through the radiation backgrounds. We show that the fluxes resulting from the decays of neutrons produced in the interactions of cosmic ray protons with the CMB background are suppressed ($E_ν^2$d$Φ_ν/$d$E< 10^{-10}$ GeV/cm$^2$ s sr), with those resulting from the decays of pions produced in the interactions with the UV/optical/IR backgrounds being the dominant ones at PeV energies. The anti-neutrino fluxes produced by the decay of neutrons resulting from the photodisintegration of heavy nuclei with CMB photons are also shown to be quite suppressed ($E_ν^2$d$Φ_ν/$d$E< 10^{-11}$ GeV/cm$^2$ s sr), while those produced by photo-pion processes with UV/optical/IR backgrounds may be larger, although they are not expected to be above those achievable in the pure proton case. Scenarios with mixed composition and low cutoff rigidities can lead to PeV neutrino fluxes enhanced with respect to those in the pure Fe scenarios. We also discuss the possible impact of the Glashow resonance for the detection of these scenarios, showing that it plays a moderate role.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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