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arXiv 1303.6482astro-ph.HE
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宇宙射线和γ射线的物理联系:星际Cosmic Ray谱的确定

On the Physics Connecting Cosmic Rays and Gamma Rays: Towards Determining the Interstellar Cosmic Ray Spectrum

C. D. Dermer, J. D. Finke, R. J. Murphy, A. W. Strong, F. Loparco, M. N. Mazziotta, E. Orlando, T. Kamae, L. Tibaldo, J. Cohen-Tanugi, M. Ackermann, T. Mizuno, F. W. Stecker

摘要:

由于费米空间观测站上的大面积望远镜获得了对~50 MeV至~40 GeV的局部星际气体伽马射线发射率的高质量测量,次级核生产物理学正受到越来越多的关注。超过90%的1 GeV以上的气体相关发射率归因于宇宙射线和星际物质碰撞中形成的中性π介子衰变产生的伽马射线,轻子引起的过程在1 GeV以下变得越来越重要。根据两个物理问题重新研究了中性π介子产生和衰变的基本运动学:等压产生是否遵循标度行为?以及通过中间体π 0的产生而形成具有一定能量的伽马射线所需的最小质子动能是多少?发射率光谱将使星际宇宙射线光谱能够可靠地确定,为起源和传播研究以及太阳调制模型的输入提供参考。这种分析的方法和说明性的结果。

英文摘要:

Secondary nuclear production physics is receiving increased attention given the high-quality measurements of the gamma-ray emissivity of local interstellar gas between ~50 MeV and ~40 GeV, obtained with the Large Area Telescope on board the Fermi space observatory. More than 90% of the gas-related emissivity above 1 GeV is attributed to gamma-rays from the decay of neutral pions formed in collisions between cosmic rays and interstellar matter, with lepton-induced processes becoming increasingly important below 1 GeV. The elementary kinematics of neutral pion production and decay are re-examined in light of two physics questions: does isobaric production follow a scaling behavior? and what is the minimum proton kinetic energy needed to make a gamma-ray of a certain energy formed through intermediate pi0 production? The emissivity spectrum will allow the interstellar cosmic-ray spectrum to be determined reliably, providing a reference for origin and propagation studies as well as input to solar modulation models. A method for such an analysis and illustrative results are presented.

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