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arXiv 1403.7627nucl-thnucl-ex
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用等密度探针布居偶极态：$^{124}$ Sn}中的pygmy偶极共振分裂

Population of dipole states via isoscalar probes: the splitting of pygmy dipole resonance in $^{124}$Sn}

Edoardo G. Lanza, Andrea Vitturi, Elena Litvinova, Deniz Savran

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6 pages, 7 figures; accepted in Phys. Rev C as Rapid Communication
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摘要：

基于相对论准粒子时间阻塞近似（RQTBA），在半经典模型框架下计算了$^{124}$ Sn中电偶极激发的非弹性$α$散射激发截面.该计算提供了缺失的环节，直接比较微观RQTBA计算的结果，最近的实验数据测量通过$(α,α'γ)$反应，这表明了结构分裂的低洼E1强度通常表示为侏儒偶极共振（PDR）。实验观察到的分裂再现的截面计算，它允许得出结论的PDR的结构。

英文摘要：

Inelastic $α$-scattering excitation cross sections are calculated for electric dipole excitations in $^{124}$Sn based on the transition densities obtained from the relativistic quasiparticle time-blocking approximation (RQTBA) in the framework of a semiclassical model. The calculation provides the missing link to directly compare the results from the microscopic RQTBA calculations to recent experimental data measured via the $(α,α'γ)$ reaction, which show a structural splitting of the low-lying E1 strength often denoted as pygmy dipole resonance (PDR). The experimentally observed splitting is reproduced by the cross section calculations, which allows to draw conclusion on the structure of the PDR.

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