The ν-Process in the Light of an Improved Understanding of Supernova Neutrino Spectra
The ν-Process in the Light of an Improved Understanding of Supernova Neutrino Spectra
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DOI：
10.3847/1538-4357/aadd48
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发表时间：
2018-05
期刊：
影响因子：
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通讯作者：
A. Sieverding;G. Martínez-Pinedo;L. Huther;K. Langanke;A. Heger
中科院分区：
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作者：
A. Sieverding;G. Martínez-Pinedo;L. Huther;K. Langanke;A. Heger
我们研究了具有太阳金属丰度的祖星爆炸性超新星核合成中中微子诱导的核素产生，包括电荷数 Z < 76 的所有原子核的中微子核反应，平均中微子能量与现代超新星模拟一致。考虑到初始主序质量在 13 M⊙ 和 30 M⊙ 之间的祖细胞，我们发现中微子核合成大量产生 11B、138La 和 180Ta，尽管中微子能量显着降低。 19F 的产生对前体质量和结构比对 ν 过程更敏感。通过我们完整的横截面集，我们已经确定了 ν 过程对几个稳定核的影响，包括 10% 水平的 33S、40Ar、41K、59Co 和 113In。中微子诱发的反应对放射性 26Al 的产生有类似的贡献，并将 22Na 的产率提高了 50%。未来的 γ 射线天文学任务可能会达到 ν 过程的贡献变得相关的灵敏度。我们发现，ν 过程产生 22Na 可以解释陨石石墨颗粒的 Ne-E(L) 成分。 ν 过程提高了 36Cl 的产量，我们指出由此产生的 36Cl/35Cl 比率与早期太阳系的推断值一致。我们扩展的中微子-核相互作用集还使我们能够排除 ν 过程对稳定核的任何进一步影响，并量化对许多迄今为止未考虑的放射性核的影响，例如 36Cl、72As、84Rb 和 88Y。
We study the neutrino-induced production of nuclides in explosive supernova nucleosynthesis for progenitor stars with solar metallicity including neutrino-nucleus reactions for all nuclei with charge numbers Z < 76, with average neutrino energies in agreement with modern supernova simulations. Considering progenitors with initial main sequence masses between 13 M⊙ and 30 M⊙, we find a significant production of 11B, 138La, and 180Ta by neutrino nucleosynthesis, despite the significantly reduced neutrino energies. The production of 19F turns out to be more sensitive to the progenitor mass and structure than to the ν-process. With our complete set of cross sections we have identified the effects of the ν-process on several stable nuclei including 33S, 40Ar, 41K, 59Co, and 113In at the 10% level. Neutrino-induced reactions contribute to a similar extent to the production of radioactive 26Al and increase the yield of 22Na by 50%. Future γ-ray astronomy missions may reach the sensitivity at which the contribution from the ν-process becomes relevant. We find that the production of 22Na by the ν-process could explain the Ne-E(L) component of meteoritic graphite grains. The ν-process enhances the yield of 36Cl and we point out that the resulting 36Cl/35Cl ratio is in agreement with the values inferred for the early solar system. Our extended set of neutrino-nucleus interactions also allows us to exclude any further effects of the ν-process on stable nuclei and to quantify the effects on numerous, hitherto unconsidered radioactive nuclei, e.g., 36Cl, 72As, 84Rb, and 88Y.