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首页> 外文期刊>The Astrophysical journal >MEASUREMENT OF THE ISOTOPIC COMPOSITION OF MANGANESE, IRON, AND NICKEL IN THE GALACTIC COSMIC RAYS
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MEASUREMENT OF THE ISOTOPIC COMPOSITION OF MANGANESE, IRON, AND NICKEL IN THE GALACTIC COSMIC RAYS

机译：银河系宇宙射线中锰，铁和镍的同位素组成的测量

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Using the small collector of the Trek experiment, a nuclear track-etch detector deployed on board the Russian space station Mir, we have made a measurement of the isotopic composition of manganese, iron, and nickel in the Galactic cosmic rays (GCR) at energies between 150 and 400 A MeV. We find that the isotopic composition of iron and nickel in the GCR source is consistent with solar system values; in particular, [~(60)Ni]/[~(58)Ni] is 0.78_(-0.29)~(+0.28) times the solar value, in contradiction to two previous results. The measurements were made in 1991-1992, during a maximum in solar activity and unusually strong solar modulation; we estimate that the analyzed GCR ions had kinetic energies between 550 and 1200 A MeV outside of the heliosphere. Based on our upper limit for the abundance of ~(56)Ni, we place a lower limit of ～24 days on the time between nucleosynthesis and acceleration of GCR material; the lack of significant enhancements in ~(54)Fe or ~(60)Ni excludes the possibility of major contributions of neutron-rich supernova zones to the GCR source. We do not find a strong depletion of ~(54)Mn, indicating that this isotope does not completely decay during propagation. We also place upper limits on the abundances of ~(54)Fe, ~(57)Fe, ~(58)Fe, ~(62)Ni, and ~(64)Ni. Our limit on the abundance of ~(58)Fe is nearly a factor of 3 lower than previously reported upper limits.
机译：使用Trek实验的小型收集器，部署在俄罗斯空间站Mir上的核径迹蚀刻检测器，我们测量了银河宇宙射线（GCR）中能量下锰，铁和镍的同位素组成MeV在150至400 A之间我们发现，GCR源中铁和镍的同位素组成与太阳系值一致。特别是，[〜（60）Ni] / [〜（58）Ni]是太阳值的0.78 _（-0.29）〜（+0.28）倍，与之前的两个结果相反。这些测量是在1991年至1992年期间进行的，当时太阳活动达到最高，太阳调制异常强。我们估计，所分析的GCR离子在太阳圈外的动能在550至1200 A MeV之间。根据〜（56）Ni丰度的上限，我们将核合成与GCR物​​质加速之间的时间的下限设定为〜24天。 〜（54）Fe或〜（60）Ni缺乏显着增强，因此排除了富中子超新星带对GCR源做出重大贡献的可能性。我们没有发现〜（54）Mn的强烈耗尽，表明该同位素在传播过程中不会完全衰减。我们还对〜（54）Fe，〜（57）Fe，〜（58）Fe，〜（62）Ni和〜（64）Ni的丰度设置了上限。我们对〜（58）Fe丰度的限制比以前报道的上限低了将近3倍。

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