Cosmogenic neutrinos from the propagation of ultrahigh energy nuclei
Cosmogenic neutrinos from the propagation of ultrahigh energy nuclei
复制标题
超高能核传播产生的宇宙中微子
DOI：
--
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
T. Yamamoto
中科院分区：
文献类型：
--
作者：
D. Allard;M. Ave;N. Busca;M. Malkan;A. Olinto;É. Parizot;F. W. Stecker;F. W. Stecker;T. Yamamoto
本文计算了高能核在宇宙学距离上传播所产生的中微子流。传播考虑了与宇宙背景辐射的相互作用，包括CMB和最新的高能（红外，光学和紫外）背景估计。我们假设源处高能宇宙线（UHECR）的成分与在低能量下观察到的成分相同。这一假设在最高能量下与目前的数据吻合得很好。我们比较了混合组分源和纯质子源的宇宙成因中微子流。我们发现，在混合成分的情况下，中微子通量有一个高的能量峰，主要是由于质子的形状和振幅类似的CMB光子的中微子离子生产。在低能量下，两种组合物的情况下有显着的中微子通量与峰值约1014.5 eV，由于较高的能量背景。混合成分的情况下，诱导一个较高的中微子通量在能量低于1013 eV，由于中子衰变组件，向下延伸到低能量。在1000万能量的中微子扩散通量的检测可以强烈地约束源分布的UHECR，而在较低的能量通量可以用来约束的VHE和UHE宇宙射线，如果结合从宇宙射线实验的成分分析。
We calculate the flux of neutrinos generated by the propagation of ultrahigh energy nuclei over cosmological distances. The propagation takes into account the interactions with cosmic background radiations including the CMB and the most recent estimates of higher energy (infrared, optical, and ultraviolet) backgrounds. We assume that the composition of ultrahigh energy cosmic rays (UHECRs) at the source is the same as the one observed at low energies. This assumption fits the present data well at the highest energies. We compare the cosmogenic neutrino flux from mixed composition sources to that from pure proton sources. We find that the neutrino flux in the mixed composition case has a high energy peak, mainly due to photopion production off CMB photons, of similar shape and amplitude to those in the proton case. At low energies both composition cases have significant neutrino flux with a peak around 1014.5 eV due to the higher energy backgrounds. The mixed composition case induces a higher flux of neutrinos at energies below 1013 eV due to the neutron decay component that extends down to low energies. Detection of diffuse neutrino fluxes at ultrahigh energies can strongly constrain the source distribution of UHECRs whereas fluxes at lower energies could be used to constrain confinement of VHE and UHE cosmic rays if combined with composition analysis from cosmic ray experiments.