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arXiv 2405.01985nucl-th
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基于含时 Hartree-Fock 理论的俘获阈值系统研究

Systematic study of capture thresholds with time dependent Hartree-Fock theory

Hong Yao, Hui Yang, Ning Wang

AI总结:

本文首次用TDHF理论系统研究144个近球形核熔合体系的俘获阈值,发现计算结果与实验势垒高度偏差仅1.43 MeV,优于经验核势,并能结合Siwek-Wilczyński公式准确重现七个熔合反应的截面数据。

摘要:

利用含时 Hartree-Fock(TDHF)理论,首次对 144 个近球形核熔合体系的俘获阈值 $E_{\ m cap}$ 进行了系统研究。我们发现,对于双幻数核之间的反应,计算得到的 $E_{\ m cap}$ 与从实验熔合激发函数中提取的势垒高度非常接近。对于近球形核的熔合反应,由于激发阈值较低,需要在俘获位置考虑约 1 MeV 的激发能,才能更好地重现实验数据。TDHF 计算得到的势垒高度均方根偏差仅为 1.43 MeV,小于三种经验核势给出的结果。结合由 TDHF 计算确定三个参数的 Siwek-Wilczyński 公式,可以很好地重现七个熔合反应在势垒附近能量下的实验熔合截面,这些反应包括 $^{40}$Ca+$^{48}$Ca、$^{16}$O+$^{208}$Pb、$^{40}$Ca+$^{90,96}$Zr、$^{28}$Si+$^{96}$Zr 以及 $^{132}$Sn+$^{40,48}$Ca。

英文摘要:

With the time dependent Hartree-Fock (TDHF) theory, capture thresholds $E_{\rm cap}$ for 144 fusion systems with nearly spherical nuclei are systematically studied for the first time. We find that for the reactions between doubly-magic nuclei, the calculated $E_{\rm cap}$ are very close to the extracted barrier heights from measured fusion excitation functions. For the fusion reactions with nearly spherical nuclei, an excitation energy of about 1 MeV at the capture position need to be considered to better reproduce the data due to the lower excitation threshold. The rms deviation with respect to the barrier heights is only 1.43 MeV from the TDHF calcualtions, which is smaller than the results from three empirical nuclear potentials. Together with Siwek-Wilczyński formula in which the three parameters are determined by the TDHF calculations, the measured fusion cross sections at energies around the barriers can be well reproduced for seven fusion reactions $^{40}$Ca+$^{48}$Ca, $^{16}$O+$^{208}$Pb, $^{40}$Ca+$^{90,96}$Zr, $^{28}$Si+$^{96}$Zr and $^{132}$Sn+$^{40,48}$Ca.

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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