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arXiv 1003.4959astro-ph.HEastro-ph.COhep-phnucl-th
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超高能Cosmic-Ray核源的中微子本底通量

Neutrino Background Flux from Sources of Ultrahigh-Energy Cosmic-Ray Nuclei

Kohta Murase, John F. Beacom

摘要:

皮埃尔俄歇天文台的结果有利于超高能(UHE)宇宙射线的重核成分的启发,我们调查的累积中微子背景的影响。原子核不能被光致衰变的要求限制了它们在源中的相互作用,因此限制了中微子通过光激子相互作用的产生。假设有$dN_{\rm CR}/dE_{\rm CR} \propto E_{\rm CR}^{-2}$注入谱和通过巨偶极共振的光致蜕变,如果UHE核普遍存在于它们的源中,中微子的背景通量将低于$E_ν^2 Φ_ν\sim {10}^{-9} {\rm GeV} {\rm cm}^{-2} {\rm s}^{-1} {\rm sr}^{-1}$。这比UHE质子的类似Waxman-Bahcall通量小大约一个数量级,并且低于预计的IceCube灵敏度。如果冰立方探测到中微子背景,可能是由于其他来源,例如,低能宇宙射线的强子核相互作用;如果不是,这支持我们对UHE核源性质的严格限制。

英文摘要:

Motivated by Pierre Auger Observatory results favoring a heavy nuclear composition for ultrahigh-energy (UHE) cosmic rays, we investigate implications for the cumulative neutrino background. The requirement that nuclei not be photodisintegrated constrains their interactions in sources, therefore limiting neutrino production via photomeson interactions. Assuming a $dN_{\rm CR}/dE_{\rm CR} \propto E_{\rm CR}^{-2}$ injection spectrum and photodisintegration via the giant dipole resonance, the background flux of neutrinos is lower than $E_ν^2 Φ_ν\sim {10}^{-9} {\rm GeV} {\rm cm}^{-2} {\rm s}^{-1} {\rm sr}^{-1}$ if UHE nuclei ubiquitously survive in their sources. This is smaller than the analogous Waxman-Bahcall flux for UHE protons by about one order of magnitude, and is below the projected IceCube sensitivity. If IceCube detects a neutrino background, it could be due to other sources, e.g., hadronuclear interactions of lower-energy cosmic rays; if it does not, this supports our strong restrictions on the properties of sources of UHE nuclei.

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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