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Neutron capture nucleosynthesis in the universe

机译：中子捕获宇宙中的核合成

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First, the nucleosynthesis in the universe was reviewed. In particular, the neutron capture nucleosyntheses in the Big-Bang and the s- and r-processes were reviewed in detail. It was pointed out that keV-neutron capture cross sections were important for the study on the neutron capture nucleosynthesis. Second, our measurement of keV-neutron capture cross sections was explained briefly, and the results on ~7Li, ~(12)C, and ~(16)O were shown and compared with previous experimental values and the predicted values from the 1/v law and the thermal neutron capture cross sections. The results at 30 keV on ~(12)C and ~(16)O were much larger than the 1/v predictions, while the result at 30 keV on ~7Li was in good agreement with the 1/v prediction. The large values for ~(12)C and ~(16)O were ascribed to the non-resonant p-wave neutron capture from the analysis of observed capture γ-ray spectra and the neutron energy dependence of derived partial capture cross sections. As for ~7Li, the good agreement was ascribed to the peculiarity of bound states of its residual nucleus, which strongly suppresses the non-resonant p-wave neutron capture. Finally, it was shown that the non-resonant p-wave neutron capture is predominant in the neutron capture nucleosynthesis of light nuclei in the universe.
机译：首先，回顾了宇宙中的核合成。特别是，对大爆炸中的中子俘获核合成以及s和r过程进行了详细综述。指出keV-中子俘获截面对于中子俘获核合成的研究很重要。其次，简要解释了我们对keV中子俘获截面的测量，并显示了〜7Li，〜（12）C和〜（16）O的结果，并将其与先前的实验值和从1 / v定律和热中子俘获截面。 〜（12）C和〜（16）O上30 keV的结果远大于1 / v的预测，而〜7Li上30 keV的结果与1 / v的预测非常吻合。 〜（12）C和〜（16）O的较大值归因于对观察到的俘获γ射线光谱的分析以及派生的部分俘获截面的中子能量依赖性，从而导致非共振p波中子俘获。至于〜7Li，良好的一致性归因于其残留核的结合态的特殊性，这强烈抑制了非共振p波中子的俘获。最后，研究表明，宇宙中轻核的中子俘获核合成主要是非共振p波中子俘获。

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