Explosive Hydrogen Burning of 27Si, 31S, 35Ar, and 39Ca in Novae and X-Ray Bursts
Explosive Hydrogen Burning of 27Si, 31S, 35Ar, and 39Ca in Novae and X-Ray Bursts
复制标题
新星和 X 射线爆发中 27Si、31S、35Ar 和 39Ca 的爆炸性氢燃烧
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
W. J. Thompson
中科院分区：
文献类型：
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作者：
C. Iliadis;P. Endt;N. Prantzos;W. J. Thompson
根据最新的核结构信息，估算了质子捕获在27Si、31S、35Ar和39Ca核上的恒星反应速率。通过使用等压多重态质量方程，找到了可靠的镜像态对应。采用改进的方法计算质子部分宽度。系统地比较了同一个同位旋多重态的激发能、光谱因子、质子部分宽度和γ射线部分宽度。恒星反应率的不确定性推导，我们的反应率相比，以前的估计。反应网络计算进行调查的影响，新的反应速率的核合成新星和X射线爆发。我们推荐的反应速率在其指定的不确定性范围内变化，我们发现爆发后对核能发电和最终丰度的影响很小。因此，与以前的说法相反，我们没有找到令人信服的理由来测量质子捕获反应27 Si，31 S，35 Ar，和39 Ca通过使用放射性离子束。
Stellar reaction rates for proton captures on the nuclei 27Si, 31S, 35Ar, and 39Ca are estimated from the most recent nuclear structure information available. Reliable mirror-state correspondences are found by using the isobaric multiplet mass equation. An improved method for calculating proton partial widths is applied. Systematic comparisons of excitation energies, spectroscopic factors, proton partial widths, and γ-ray partial widths for states of the same isospin multiplet are presented. Stellar reaction-rate uncertainties are deduced, and our reaction rates are compared to previous estimates. Reaction network calculations are performed to investigate implications of the new reaction rates for nucleosynthesis in novae and X-ray bursts. Our recommended reaction rates are varied within their assigned uncertainties, and we find only minor effects on the nuclear energy generation and the final abundances after the outbursts. Thus, contrary to previous claims, we find no compelling reason for measuring the proton capture reactions on 27Si, 31S, 35Ar, and 39Ca by using radioactive ion beams.