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arXiv 2011.11943nucl-th
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从巨共振的$γ$衰变中了解巨共振的结构

Learning the structure of giant resonances from their $γ$-decay

W. L. Lv, Y. F. Niu, G. Colò

摘要:

用微观自洽模型研究了$^{208}$ Pb的巨偶极共振(GDR)和巨四极共振(GQR)直接$γ$ -衰变到低能态.该模型考虑了超出线性响应近似的影响。证明了$γ$ -衰变对所涉及态的同位旋具有很强的敏感性。通过比较它们的衰减宽度,推导出相对于GDR波函数中的$2_{1}^{+}$分量的权重,$^{208}$ Pb的GQR波函数中的$3_{1}^{-}$分量的权重大得多。因此,我们已经证明,$γ$ -衰变是共振波函数的独特探测器,也是原子核结构模型的测试场。

英文摘要:

The direct $γ$-decays of the giant dipole resonance (GDR) and the giant quadrupole resonance (GQR) of $^{208}$Pb to low-lying states are investigated by means of a microscopic self-consistent model. The model considers effects beyond the linear response approximation. The strong sensitivity of $γ$-decay to the isospin of the involved states is proven. By comparing their decay widths, a much larger weight of the $3_{1}^{-}$ component in the GQR wave function of $^{208}$Pb is deduced, with respect to the weight of the $2_{1}^{+}$ component in the GDR wave function. Thus, we have shown that $γ$-decay is a unique probe of the resonance wave functions, and a testground for nuclear structure models.

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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