首页> 外文期刊>The Astrophysical journal >MASS-INDEPENDENT ISOTOPE FRACTIONATION OF MOLYBDENUM AND RUTHENIUM AND THE ORIGIN OF ISOTOPIC ANOMALIES IN MURCHISON
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MASS-INDEPENDENT ISOTOPE FRACTIONATION OF MOLYBDENUM AND RUTHENIUM AND THE ORIGIN OF ISOTOPIC ANOMALIES IN MURCHISON

机译:默奇森中钼和R的质量独立同位素分馏和同位素异常的起源

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摘要

Dauphas et al.'s model for the nucleosynthetic origin of Mo and Ru anomalies in meteorites leaves the case of Murchison (CM2) unexplained. We explore the possibility that such a discrepancy is due to mass-independent effects controlled by nuclear field shift with, in particular, "staggering" between odd and even masses. We first demonstrate the existence of such mass-independent fractionation of Mo and Ru isotopes by chemical exchange of Mo and Ru between DC18C6 crown ether and aqueous solutions. Our results fit the nuclear field shift theory of Bigeleisen. We then review the correlation between the mean-square charge radius (which controls the nuclear field shift) and the isotopic anomalies found in an Allende CAI and in Murchison. Although Mo and Ru in the Allende CAI show a clear indication of nucleosynthetic components, the mass-independent anomalies observed in Murchison show a strong correlation with the nuclear charge distribution. We therefore argue that some isotopic anomalies observed in meteorites may be due to nuclear field shift rather than nucleosynthetic processes. Such effects are temperature dependent and may represent either genuine nebular processes or analytical artifacts. This new interpretation may help assess the existence of anomalies due to the extinct isotopes ~(97)Tc and ~(98)Tc.
机译:Dauphas等人关于陨石中Mo和Ru异常的核合成起源的模型尚无法解释Murchison(CM2)的情况。我们探索这种差异是由于核场移动控制的质量无关效应(尤其是奇数质量和偶数质量之间的“交错”)引起的可能性。我们首先通过在DC18C6冠醚和水溶液之间化学交换Mo和Ru来证明Mo和Ru同位素的质量无关分馏的存在。我们的结果符合Bigeleisen的核场位移理论。然后,我们回顾了均方电荷半径(控制核场移动)与Allende CAI和Murchison中发现的同位素异常之间的相关性。尽管Allende CAI中的Mo和Ru清楚地表明了核合成成分,但在Murchison中观察到的质量无关的异常与核电荷分布密切相关。因此,我们认为在陨石中观察到的某些同位素异常可能是由于核场移位而不是核合成过程引起的。这种影响取决于温度,可能代表真正的神经突或分析伪影。这种新的解释可能有助于评估由于〜(97)Tc和〜(98)Tc的灭绝同位素引起的异常的存在。

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