Cosmic-ray positron energy spectrum measured by PAMELA.
Cosmic-ray positron energy spectrum measured by PAMELA.
复制标题
DOI：
10.1103/physrevlett.111.081102
复制
发表时间：
2013-08
影响因子：
8.6
通讯作者：
O. Adriani;G. Barbarino;G. Bazilevskaya;R. Bellotti;A. Bianco;M. Boezio;É. Bogomolov;M. Bongi
中科院分区：
文献类型：
--
作者：
O. Adriani;G. Barbarino;G. Bazilevskaya;R. Bellotti;A. Bianco;M. Boezio;É. Bogomolov;M. Bongi
对宇宙辐射中正电子成分的精确测量提供了关于宇宙射线传播和银河系中粒子源性质的重要信息。卫星上的PAMELA实验被用来对宇宙射线正电子通量和分数进行新的测量，将以前公布的测量结果扩展到300 GeV的动能。宇宙射线正电子能谱和分数的联合测量提供了一个独特的工具来约束解释模型。在2006年7月至2009年12月的太阳活动最低期，观测到约24，500个正电子。结果不能轻易地与纯粹的二次生产相协调，可能需要天体物理或外来起源的额外来源。
Precision measurements of the positron component in the cosmic radiation provide important information about the propagation of cosmic rays and the nature of particle sources in our Galaxy. The satellite-borne experiment PAMELA has been used to make a new measurement of the cosmic-ray positron flux and fraction that extends previously published measurements up to 300 GeV in kinetic energy. The combined measurements of the cosmic-ray positron energy spectrum and fraction provide a unique tool to constrain interpretation models. During the recent solar minimum activity period from July 2006 to December 2009, approximately 24,500 positrons were observed. The results cannot be easily reconciled with purely secondary production, and additional sources of either astrophysical or exotic origin may be required.