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arXiv 1006.4716nucl-ex
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163、164 Dy的辐射强度函数

Radiative strength functions in 163,164Dy

H. T. Nyhus, S. Siem, M. Guttormsen, A. C. Larsen, A. Bürger, N. U. H. Syed, G. M. Tveten, A. Voinov

摘要:

用奥斯陆方法研究了核163、164 Dy的吸核反应164 Dy(~ 3 He,α-γ)163 Dy和非弹性散射164 Dy(~ 3 He,~ 3 He '-γ)164 Dy。两个核的辐射强度函数已被提取,和一个小的共振集中在Eg?在这两种情况下都观察到3 MeV。这种所谓的侏儒M1共振(剪刀模式)的参数进行比较,以前的结果160,161,162 Dy使用奥斯陆方法,和布拉格组使用两步级联方法测量的163 Dy的数据。特别是,积分约化跃迁概率B(M1)的俾格米共振与邻近的镝同位素进行比较。我们还观察到在164 Dy中超过5 MeV的伽马能量的区域中的增强强度。这种功能的可能起源进行了讨论。

英文摘要:

The nuclei 163,164Dy have been investigated using the Oslo method on data from the pick-up reaction 164Dy(3He,alpha gamma)163Dy and the inelastic scattering 164Dy(3He,3He' gamma)164Dy, respectively. The radiative strength functions for both nuclei have been extracted, and a small resonance centered around Eg ?3 MeV is observed in both cases. The parameters of this so-called pygmy M1 resonance (the scissors mode) are compared to previous results on 160,161,162Dy using the Oslo method, and to data on 163Dy measured by the Prague group using the two-step cascade method. In particular, the integrated reduced transition probability B(M1) of the pygmy resonance is compared with neighboring dysprosium isotopes. We also observe an enhanced strength in the region above gamma energy around 5 MeV in 164Dy. Possible origins of this feature are discussed.

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