THE UNREASONABLE WEAKNESS OF R-PROCESS COSMIC RAYS IN THE NEUTRON-STAR-MERGER NUCLEOSYNTHESIS SCENARIO
THE UNREASONABLE WEAKNESS OF R-PROCESS COSMIC RAYS IN THE NEUTRON-STAR-MERGER NUCLEOSYNTHESIS SCENARIO
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DOI：
10.3847/0004-637x/827/1/83
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发表时间：
2016-03
期刊：
影响因子：
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通讯作者：
K. Kyutoku;K. Ioka
中科院分区：
文献类型：
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作者：
K. Kyutoku;K. Ioka
我们得出的结论,结合r过程元素的观察宇宙射线与neutron-star-merger喷出物的速度远远高于超新星抛出物,要么(1)反向冲击neutron-star-merger喷出物是一种非常低效的加速器,将不到0.003%的喷出物的动能转换成中子星的宇宙射线能量或(2)合并不是银河r过程元素的起源。我们还发现，当观测到的宇宙射线比铁轻时，超新星抛射物的反向激波的加速效率应小于0.1%。
We reach the robust conclusion that, by combining the observed cosmic rays of r-process elements with the fact that the velocity of the neutron-star-merger ejecta is much higher than that of the supernova ejecta, either (1) the reverse shock in the neutron-star-merger ejecta is a very inefficient accelerator that converts less than 0.003% of the ejecta kinetic energy to the cosmic-ray energy or (2) the neutron star merger is not the origin of the Galactic r-process elements. We also find that the acceleration efficiency should be less than 0.1% for the reverse shock of the supernova ejecta with observed cosmic rays lighter than the iron.