New Determination of the 12C(α, γ)16O Reaction Rate and Its Impact on the Black-hole Mass Gap
New Determination of the 12C(α, γ)16O Reaction Rate and Its Impact on the Black-hole Mass Gap
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DOI：
10.3847/1538-4357/acb7de
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发表时间：
2023-03
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通讯作者：
Yangping Shen;B. Guo;R. deBoer;E. Li;Zhihong Li;Yunju Li;Xiao-Dong Tang;D. Pang;Sucheta Adhikari;C. Basu;J. Su;Shengquan Yan;Q. Fan;Jiancheng Liu;Chen Chen-Chen;Zhiyu Han;Xinyue Li;G. Lian;T. Ma;W. Nan;W. Nan;Y. Wang;S. Zeng;Hao Zhang;Weiping Liu
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作者：
Yangping Shen;B. Guo;R. deBoer;E. Li;Zhihong Li;Yunju Li;Xiao-Dong Tang;D. Pang;Sucheta Adhikari;C. Basu;J. Su;Shengquan Yan;Q. Fan;Jiancheng Liu;Chen Chen-Chen;Zhiyu Han;Xinyue Li;G. Lian;T. Ma;W. Nan;W. Nan;Y. Wang;S. Zeng;Hao Zhang;Weiping Liu
利用四极三偶极(Q3D)磁谱仪，通过12C(11B，7Li)16O转移反应，精确测量了16O基态的渐近归一化系数(ANC)。这项工作揭示了先前报告的GS ANC值之间存在的超过2个数量级的差异。通过将外部俘获限制在16O基态，这可能会干扰2+亚阈值状态的高能尾部，这被认为对12C(α，γ)16O反应速率有很强的影响。在此基础上，我们确定了天体物理S因子和12C(α，γ)16O反应的恒星速率。与最近一篇综述的先前建议相比，在天体物理相关的温度范围内发现总反应速率增加高达21%。最后，我们利用梅萨恒星演化程序，通过演化大质量氦核恒星，评估了我们的新速率对黑洞(BH)对不稳定质量间隙的影响。更新后的~(12)C(α，γ)~(16)O反应速率使BH带隙的上、下缘分别减少了约12%和5%。
We present a precise measurement of the asymptotic normalization coefficient (ANC) for the 16O ground state (GS) through the 12C(11B, 7Li)16O transfer reaction using the Quadrupole‐3‐Dipole (Q3D) magnetic spectrograph. The present work sheds light on the existing discrepancy of more than 2 orders of magnitude between the previously reported GS ANC values. This ANC is believed to have a strong effect on the 12C(α, γ)16O reaction rate by constraining the external capture to the 16O ground state, which can interfere with the high-energy tail of the 2+ subthreshold state. Based on the new ANC, we determine the astrophysical S-factor and the stellar rate of the 12C(α, γ)16O reaction. An increase of up to 21% in the total reaction rate is found within the temperature range of astrophysical relevance compared with the previous recommendation of a recent review. Finally, we evaluate the impact of our new rate on the pair-instability mass gap for black holes (BH) by evolving massive helium core stars using the MESA stellar evolution code. The updated 12C(α, γ)16O reaction rate decreases the lower and upper edges of the BH gap about 12% and 5%, respectively.