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arXiv 0709.0734astro-phhep-ph
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根据皮埃尔俄歇天文台的新资料对宇宙成因中微子通量的预测

Predictions for the Cosmogenic Neutrino Flux in Light of New Data from the Pierre Auger Observatory

Luis A. Anchordoqui, Haim Goldberg, Dan Hooper, Subir Sarkar, Andrew M. Taylor

备注：
10 pages, 7 figures
发表信息：
Phys.Rev.D76:123008,2007
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摘要：

皮埃尔俄歇天文台（PAO）以前所未有的精度测量了高能宇宙射线的光谱和成分。我们使用这些测量来约束它们的光谱和成分，从它们的来源注入，反过来，使用这些结果来估计宇宙成因中微子的光谱在其传播通过星系际空间。我们发现，如果注入的宇宙射线完全由质量在中间（C，N，O）到重（Fe，Si）范围内的原子核组成，PAO测量可以很好地拟合。质子和较重物质的混合物也是可以接受的，但（在现有的强子相互作用模型的基础上）注入纯轻核（p，He）的结果在不可接受的适合新的伸长率数据。宇宙成因中微子的预期光谱可能会有很大的变化，这取决于宇宙射线源注入的精确光谱和化学成分。在重核主导宇宙射线谱和少数解离质子超过GZK能量的模型中，宇宙成因中微子通量相对于全质子预测可以被抑制高达两个数量级，使其探测超出了当前和计划中的中微子望远镜的范围。然而，与数据一致的其他模型是质子主导的，只有少量（1-10%）的重核混合物，并预测在即将到来的实验范围内的相关宇宙起源通量。因此，宇宙成因中微子的检测或未检测可以帮助区分这些可能性。

英文摘要：

The Pierre Auger Observatory (PAO) has measured the spectrum and composition of the ultrahigh energy cosmic rays with unprecedented precision. We use these measurements to constrain their spectrum and composition as injected from their sources and, in turn, use these results to estimate the spectrum of cosmogenic neutrinos generated in their propagation through intergalactic space. We find that the PAO measurements can be well fit if the injected cosmic rays consist entirely of nuclei with masses in the intermediate (C, N, O) to heavy (Fe, Si) range. A mixture of protons and heavier species is also acceptable but (on the basis of existing hadronic interaction models) injection of pure light nuclei (p, He) results in unacceptable fits to the new elongation rate data. The expected spectrum of cosmogenic neutrinos can vary considerably, depending on the precise spectrum and chemical composition injected from the cosmic ray sources. In the models where heavy nuclei dominate the cosmic ray spectrum and few dissociated protons exceed GZK energies, the cosmogenic neutrino flux can be suppressed by up to two orders of magnitude relative to the all-proton prediction, making its detection beyond the reach of current and planned neutrino telescopes. Other models consistent with the data, however, are proton-dominated with only a small (1-10%) admixture of heavy nuclei and predict an associated cosmogenic flux within the reach of upcoming experiments. Thus a detection or non-detection of cosmogenic neutrinos can assist in discriminating between these possibilities.

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