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arXiv 2409.09515nucl-thastro-ph.SR
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采用手征两核子与三核子力对 $^3$He$(α,γ)^7$Be 天体物理 S 因子的从头算

Ab initio calculation of the $^3$He$(α,γ)^7$Be astrophysical S factor with chiral two- and three-nucleon forces

M. C. Atkinson, K. Kravvaris, S. Quaglioni, P. Navrátil

AI总结:

本文首次用显式含三核子力的从头算方法计算 $^3$He$(α,γ)^7$Be 天体物理 S 因子,并结合束缚态与散射数据揭示 $1/2^+$ 道核力约束不足。

摘要:

$^3$He$(α,γ)^7$Be 辐射俘获反应在恒星中元素的形成以及太阳中微子的产生中发挥关键作用,而对太阳中微子的观测是研究太阳性质的主要工具之一。由于反应物之间存在强烈的库仑斥力,在太阳能量下对这一聚变截面进行精确实验测量十分困难,因此有责任由理论提供一种可靠方法,把已有实验数据的能区外推至所需的天体物理区域。我们提出了首个显式包含三核子力的 $^3$He$(α,γ)^7$Be 微观计算。我们对天体物理 $S$ 因子的预测在定性上与实验数据一致。我们还在计算中纳入实验束缚态和散射信息,以获得更定量的描述。这一过程表明,当前模型在其模型空间的 $1/2^+$ 道中缺乏足够的排斥作用,因而无法同时再现弹性散射数据。这一不足说明,$^3$He$(α,γ)^7$Be 探测了目前尚未得到良好约束的核力方面。

英文摘要:

The $^3$He$(α,γ)^7$Be radiative capture reaction plays a key role in the creation of elements in stars as well as in the production of solar neutrinos, the observation of which is one of the main tools to study the properties of our sun. Since accurate experimental measurements of this fusion cross section at solar energies are difficult due to the strong Coulomb repulsion between the reactants, the onus falls on theory to provide a robust means for extrapolating from the region where experimental data is available down to the desired astrophysical regime. We present the first microscopic calculations of $^3$He$(α,γ)^7$Be with explicit inclusion of three-nucleon forces. Our prediction of the astrophysical $S$ factor qualitatively agrees with experimental data. We further incorporate experimental bound-state and scattering information in our calculation to arrive at a more quantitative description. This process reveals that our current model lacks sufficient repulsion in the $1/2^+$ channel of our model space to simultaneously reproduce elastic-scattering data. This deficit suggests that $^3$He$(α,γ)^7$Be probes aspects of the nuclear force that are not currently well-constrained.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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