最轻钼同位素的起源
On the origin of the lightest Molybdenum isotopes
摘要：
我们讨论了最近的精确测量的Rh93质子分离能量的生产最轻的钼同位素在富含质子的II型超新星喷出物的影响。最近的研究表明，一种新的中微子诱导过程使这些喷出物成为产生轻钼同位素和其他原子质量接近100的"p核"的有希望的场所。这些同位素的来源长期以来一直不确定。中微子辐照流出核合成的一个显着特点是，Mo 92和Mo 94的相对产量是由Rh93的质子分离能决定的竞争。我们使用详细的核网络计算和最近的实验结果，这种质子分离能量的流出特性，产生最轻的钼同位素在其太阳能比例的限制。据发现，在最近的二维超新星模拟计算的条件下，以及在这些条件下的大范围的流出特性，太阳比的Mo 92到Mo 94不能实现。这表明，要么来自II型超新星的富含质子的风并不完全产生这两种同位素，要么这些风与今天的超新星模型计算的有质的不同。
英文摘要：
We discuss implications of recent precision measurements for the Rh93 proton separation energy for the production of the lightest molybdenum isotopes in proton-rich type II supernova ejecta. It has recently been shown that a novel neutrino-induced process makes these ejecta a promising site for the production of the light molybdenum isotopes and other "p-nuclei" with atomic mass near 100. The origin of these isotopes has long been uncertain. A distinguishing feature of nucleosynthesis in neutrino-irradiated outflows is that the relative production of Mo92 and Mo94 is set by a competition governed by the proton separation energy of Rh93. We use detailed nuclear network calculations and the recent experimental results for this proton separation energy to place constraints on the outflow characteristics that produce the lightest molybdenum isotopes in their solar proportions. It is found that for the conditions calculated in recent two-dimensional supernova simulations, and also for a large range of outflow characteristics around these conditions, the solar ratio of Mo92 to Mo94 cannot be achieved. This suggests that either proton-rich winds from type II supernova do not exclusively produce both isotopes, or that these winds are qualitatively different than calculated in today's supernova models.
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