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arXiv 2405.03210nucl-th
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势模型下BBN能量区质子-氘核辐射俘获中的磁偶极跃迁

Magnetic dipole transition in proton-deuteron radiative capture at BBN energies within potential model

Nguyen Le Anh, Dao Nhut Anh, Do Huy Tho, Nguyen Huu Nha

AI总结:

本文在势模型框架下分析了1 MeV以下质子-氘核辐射俘获的电偶极和磁偶极跃迁,所得S因子和反应率与近期结果吻合良好,并确定了S(0)值。

摘要:

质子-氘核($pd$)辐射俘获反应在大爆炸核合成(Big Bang nucleosynthesis)和恒星质子-质子链中起着至关重要的作用。低能反应的研究在实验和理论上都具有挑战性。利用势模型框架,我们分析了1 MeV以下的$pd$辐射俘获,包括电偶极($E1$)和磁偶极($M1$)跃迁。得到的天体物理$S$因子与近期结果吻合良好,尤其是在与敏感的氘丰度相关的能量处。计算得到的反应率与近期工作相比显示出良好的一致性,差异小于5%。包括两种跃迁的外推值$S(0)$确定为$0.211 \pm 0.016$ eV b。使用$χ^2$检验与实验数据的比较揭示了低能下$M1$截面对散射势深度的敏感性。

英文摘要:

The $pd$ radiative capture reaction plays a vital role in Big Bang nucleosynthesis and stellar proton-proton chain. The study of the low-energy reaction is challenging in both experiments and theories. Using the framework of potential model, we analyze $pd$ radiative capture below 1 MeV for both electric dipole ($E1$) and magnetic dipole ($M1$) transitions. The obtained astrophysical $S$ factors agree well with recent results, especially at energies relevant to sensitive deuterium abundance. The calculated reaction rate shows good agreement, with less than a 5\% difference compared to recent works. The extrapolated value for $S(0)$ including both transitions is determined to be $0.211 \pm 0.016$ eV b. A comparison with experimental data using the $χ^2$ test reveals the sensitivity of the $M1$ cross section at low energies to the scattering potential depth.

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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