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arXiv 0901.0254astro-ph.HE
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超高能Cosmic Ray质子:特征和观察

Ultra High Energy Cosmic Ray Protons: Signatures and Observations

V. Berezinsky

摘要:

讨论了超高能宇宙射线(UHECR)中的Greisen-Zatsepin-Kuzmin(GZK)截止和对产生下降的情况,它们是河外质子通过宇宙微波背景辐射(CMB)传播的光谱特征,这些特征的发现意味着初级粒子主要是河外质子。用AGASA、Yakutsk、HiRes和Auger探测器测量的光谱与成对产生的倾角吻合得很好,HiRes数据为GZK截止提供了强有力的证据。在2007年红十字国际委员会第30届会议上提出的俄歇光谱也与GZK截止值一致。AGASA的数据与GZK截止点在E \leq 80 EeV处的起始值吻合得很好,但显示出在更高能量处的事件过剩,其起源尚不清楚。在每次实验的系统误差范围内,能量移动后,不同探测器测量的绝对通量的差异消失。

英文摘要:

The status of the Greisen-Zatsepin-Kuzmin (GZK) cutoff and pair-production dip in Ultra High Energy Cosmic Rays (UHECR) is discussed.They are the features in the spectrum of protons propagating through CMB radiation in extragalactic space, and discovery of these features implies that primary particles are mostly extragalactic protons. The spectra measured by AGASA, Yakutsk, HiRes and Auger detectors are in good agreement with the pair-production dip, and HiRes data have strong evidences for the GZK cutoff. The Auger spectrum,as presented at the 30th ICRC 2007, agrees with the GZK cutoff, too. The AGASA data agree well with the beginning of the GZK cutoff at E \leq 80 EeV, but show the excess of events at higher energies, the origin of which is not understood. The difference in the absolute fluxes measured by different detectors disappears after energy shift within the systematic errors of each experiment.

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