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首页> 外文期刊>The Astrophysical journal >THE r-PROCESS IN SUPERNOVAE: IMPACT OF NEW MICROSCOPIC MASS FORMULAE
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THE r-PROCESS IN SUPERNOVAE: IMPACT OF NEW MICROSCOPIC MASS FORMULAE

机译：超新星中的r过程：新的微观质量公式的影响

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摘要

The astrophysical origin of r-process nuclei is a long-standing mystery. Although some astrophysical scenarios show some promise, many uncertainties involved in both the astrophysical conditions and in the nuclear properties far from the β-stability have inhibited us from understanding the nature of the r-process. The purpose of the present paper is to examine the effects of the newly derived microscopic Hartree-Fock-Bogoliubov (HFB) mass formulae on r-process nucleosynthesis and analyze to what extent a solar-like r-abundance distribution can be obtained. The r-process calculations with the HFB-2 mass formula are performed, adopting the parameterized model of the prompt explosion from a collapsing O-Ne-Mg core for the physical conditions, and compared with the results obtained with the HFB-7 and droplet-type mass formulae. Because of its weak shell effect at the neutron magic numbers in the neutron-rich region, the microscopic mass formulae (HFB-2 and HFB-7) give rise to a spread of the abundance distribution in the vicinity of the r-process peaks (A = 130 and 195). While this effect resolves the large underproduction at A ≈ 115 and 140 obtained with droplet-type mass formulae, large deviations compared to the solar pattern are found near the third r-process peak. It is shown that a solar-like r-process pattern can be obtained if the dynamical timescales of the outgoing mass trajectories are increased by a factor of about 2-3, or if the β-decay rates are systematically increased by the same factor.
机译：r过程核的天体起源是一个长期存在的谜。尽管一些天文学的情景显示出一定的希望，但天文学的条件和远离β稳定性的核特性所涉及的许多不确定性使我们无法理解r过程的性质。本文的目的是检验新近推导的微观Hartree-Fock-Bogoliubov（HFB）质谱公式对r-过程核合成的影响，并分析在多大程度上可以获得太阳样的r-丰度分布。使用HFB-2质量公式的r过程计算，采用物理状态下从坍塌的O-Ne-Mg核快速爆炸的参数化模型，并将其与HFB-7和液滴获得的结果进行比较型质量公式。由于其在富中子区中子魔术数处的弱壳效应，微观质量公式（HFB-2和HFB-7）引起丰度分布在r过程峰附近的扩展（ A = 130和195）。虽然这种效果解决了使用液滴型质量公式在A≈115和140时产生的大量生产不足的问题，但在第三个r过程峰附近发现了与太阳图案相比的较大偏差。结果表明，如果输出质量轨迹的动态时间尺度增加约2-3倍，或者系统地将β衰变速率增加相同倍数，则可以获得类似太阳的r过程模式。

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