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arXiv 1204.4492astro-ph.HE
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Cosmic Ray光谱硬化的起源

Origin of the Cosmic Ray Spectral Hardening

N. Tomassetti

摘要:

来自ATIC、CREAM和PAMELA的最新数据表明,质子和原子核的宇宙射线能谱在每个核子能量超过100 GeV时表现出显著的硬化。我们认为,硬化是一种星际传播效应,起源于宇宙射线输运性质在银河系不同区域的空间变化。关键的假设是,扩散系数是不能分离成能量和空间变量通常假设。在这种情况下,我们可以很好地再现观测数据。我们的模型有几个宇宙射线加速/传播物理的影响,并可以通过正在进行的实验,如阿尔法磁谱仪或费米/LAT进行测试。

英文摘要:

Recent data from ATIC, CREAM and PAMELA indicate that the cosmic ray energy spectra of protons and nuclei exhibit a remarkable hardening at energies above 100 GeV per nucleon. We propose that the hardening is an interstellar propagation effect that originates from a spatial change of the cosmic-ray transport properties in different regions of the Galaxy. The key hypothesis is that the diffusion coefficient is not separable into energy and space variables as usually assumed. Under this scenario, we can reproduce the observational data well. Our model has several implications for the cosmic-ray acceleration/propagation physics and can be tested by ongoing experiments such as the Alpha Magnetic Spectrometer or Fermi/LAT.

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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