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arXiv 0901.2443nucl-ex
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稳定锡同位素中俾格米偶极共振的激发能和强度

Excitation energy and strength of the pygmy dipole resonance in stable tin isotopes

B. Özel, J. Enders, H. Lenske, P. von Neumann-Cosel, I. Poltoratska, V. Yu. Ponomarev, A. Richter, D. Savran, N. Tsoneva

摘要:

在S-DALINAC上研究了$^{112,120}$ Sn $(γ,γ')$反应。电偶极子(E1)的强度分布已经确定,包括未解决的波动分析提取的强度的贡献。结合已有的$^{116,124}$ Sn的实验数据,建立了稳定的偶数质量锡同位素的侏儒偶极共振(PDR)的实验系统。PDR的质心激发能和总强度是在合理的协议与准粒子声子模型计算的基础上的平均场的非相对论描述,但不同意相对论准粒子随机相位近似预测。

英文摘要:

The $^{112,120}$Sn$(γ,γ')$ reactions have been studied at the S-DALINAC. Electric dipole (E1) strength distributions have been determined including contributions from unresolved strength extracted by a fluctuation analysis. Together with available data on $^{116,124}$Sn, an experimental systematics of the pygmy dipole resonance (PDR) in stable even-mass tin isotopes is established. The PDR centroid excitation energies and summed strengths are in reasonable agreement with quasiparticle-phonon model calculations based on a nonrelativistic description of the mean field but disagree with relativistic quasiparticle random-phase approximation predictions.

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