arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0803.2494astro-ph
收藏

超高能cosmic ray核的次级质子:Greisen-Zatsepin-Kuzmin截止是不可避免的吗?

Secondary protons from ultra high energy cosmic ray nuclei: is the Greisen-Zatsepin-Kuzmin cutoff unavoidable?

R. Aloisio, V. Berezinsky, A. Gazizov

摘要:

讨论了宇宙线原初核通过宇宙微波背景(CMB)和红外(IR)辐射在星系际空间传播时产生超高能次级质子的情况。在假定只有原子质量数为$A_0$的初级核被加速的情况下,计算了次级质子的能谱。发现对于所有的$A_0$,在能量为$E \sim (1 - 2)\times 10^{19}$ eV时,次级质子的扩散通量开始超过初级核的扩散通量,从而产生了标准的Greisen-Zatsepin -Kuzmin(GZK)截止。

英文摘要:

We discuss the production of ultra high energy secondary protons by cosmic ray primary nuclei propagating in the intergalactic space through Cosmic Microwave Background (CMB) and Infrared (IR) radiations. Under the assumption that only primary nuclei with a fixed atomic mass number $A_0$ are accelerated, the spectrum of secondary protons is calculated. It is found that for all $A_0$ the diffuse flux of secondary protons starts to dominate over that of primary nuclei at energy $E \sim (1 - 2)\times 10^{19}$ eV, and thus the standard Greisen-Zatsepin -Kuzmin (GZK) cutoff is produced.

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。

↑