稳定N=82同位素中Pygmy偶极共振的碎裂和系统学
Fragmentation and systematics of the Pygmy Dipole Resonance in the stable N=82 isotones
摘要：
测量了半魔核136 π中的低位电偶极（E1）强度，完成了利用入射道实光子核共振荧光方法研究所有稳定偶核（N=82）中所谓的侏儒偶极共振（PDR）的系统性研究。在所有情况下，在5 MeV至8 MeV的能量区域中观察到E1强度的碎片化共振状结构。的强度的碎片的分析表明，碎片的程度减少对质子缺乏的同位素，而总的综合强度增加，表明依赖于中子-质子比的总强度。实验结果进行了比较，准粒子声子模型（QPM）内的微观计算。该计算包括复杂的配置，最多三个声子，并能够再现也分裂的E1强度，从而可以得出结论的PDR的阻尼。计算和实验数据是在良好的协议的破碎程度，也在综合强度，如果考虑到实验的灵敏度限制。
英文摘要：
The low-lying electric dipole (E1) strength in the semi-magic nucleus 136Xe has been measured which finalizes the systematic survey to investigate the so-called pygmy dipole resonance (PDR) in all stable even N=82 isotones with the method of nuclear resonance fluorescence using real photons in the entrance channel. In all cases, a fragmented resonance-like structure of E1 strength is observed in the energy region 5 MeV to 8 MeV. An analysis of the fragmentation of the strength reveals that the degree of fragmentation decreases towards the proton-deficient isotones while the total integrated strength increases indicating a dependence of the total strength on the neutron-to-proton ratio. The experimental results are compared to microscopic calculations within the quasi-particle phonon model (QPM). The calculation includes complex configurations of up to three phonons and is able to reproduce also the fragmentation of the E1 strength which allows to draw conclusions on the damping of the PDR. Calculations and experimental data are in good agreement in the degree of fragmentation and also in the integrated strength if the sensitivity limit of the experiments is taken into account.
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