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Medium Modification of a Cluster Size in ~6Li

机译：中等修改〜6LI中的簇大小

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摘要

The giant dipole resonance (GDR) in ~6Li was investigated via the ~6LI(γ, xn)reaction, where x=1, 2 or 3 at an incident energy range of E_γ=5-55 MeV. The(y, n)cross section was the most dominant cross section among them. The GDR in ~6Li was found to consist of two components at E_x=11 MeV and 33 MeV. The component at E_x=11 MeV seems to be the intrinsic GDR in ~6Li. The other at E_x=33 MeV is inferred to be the GDR due to the a cluster excitation in ~6Li, based on the comparison with the results in light ion reactions. The GDR in free~4He is known to locate at E_x=26 MeV. However, the GDR excitation energy due tothe a cluster excitation in ~6Li is found to be higher than that of the ~4He. This fact suggests that the size of the a cluster in ~6Li is smaller than that of ~4He due to the nuclear medium effect.
机译：通过〜6LI（γ，XN）反应研究〜6LI的巨池共振（GDR），其中X = 1,2或3，在E_γ= 5-55meV的入射能量范围内。 （y，n）横截面是其中最占主导地位的横截面。发现GDR在〜6LI中，由E_X = 11 MeV和33 MeV的两个组件组成。 E_x = 11 mev的组件似乎是〜6LI的内在GDR。由于与光离子反应结果的比较，另一个在e_x = 33mev处被推断为GDR是由于〜6LI中的簇激发。已知GDR〜4HE的GDR定位在E_X = 26 MEV。然而，发现GDR激发能量诱使在〜6LI中的簇激发高于〜4He的簇励磁。这一事实表明，由于核介质效应，〜6Li中簇的大小小于〜4he的尺寸。

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