The decay pattern of the Pygmy Dipole Resonance of 140Ce
The decay pattern of the Pygmy Dipole Resonance of 140Ce
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DOI：
10.1016/j.physletb.2016.02.042
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发表时间：
2016-05
影响因子：
4.4
通讯作者：
B. Löher;D. Savran;T. Aumann;J. Beller;M. Bhike;N. Cooper;V. Derya;M. Duchêne;J. Endres;A. Hennig;P. Humby;J. Isaak;J. Kelley;M. Knörzer;N. Pietralla;V. Ponomarev;C. Romig;M. Scheck;H. Scheit;J. Silva;A. Tonchev;W. Tornow;F. Wamers;H. Weller;V. Werner;A. Zilges
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文献类型：
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作者：
B. Löher;D. Savran;T. Aumann;J. Beller;M. Bhike;N. Cooper;V. Derya;M. Duchêne;J. Endres;A. Hennig;P. Humby;J. Isaak;J. Kelley;M. Knörzer;N. Pietralla;V. Ponomarev;C. Romig;M. Scheck;H. Scheit;J. Silva;A. Tonchev;W. Tornow;F. Wamers;H. Weller;V. Werner;A. Zilges
利用核共振荧光和γ -γ重合技术的新组合研究了半幻N= 82原子核140 Ce中侏儒偶极子共振（PDR）的衰变特性。对于单个激发态和激发能区间，以直接和模型无关的方式确定了向低洼激发态过渡的分支比。将实验结果与准粒子声子模型的微观计算结果进行比较，得到了很好的一致性，支持了矮偶极子共振与基态和低洼激发态耦合的观测结果。提取10%的PDR和[21 +× PDR]混合物。
The decay properties of the Pygmy Dipole Resonance (PDR) have been investigated in the semi-magic N= 82 nucleus 140 Ce using a novel combination of nuclear resonance fluorescence and γ–γ coincidence techniques. Branching ratios for transitions to low-lying excited states are determined in a direct and model-independent way both for individual excited states and for excitation energy intervals. Comparison of the experimental results to microscopic calculations in the quasi-particle phonon model exhibits an excellent agreement, supporting the observation that the Pygmy Dipole Resonance couples to the ground state as well as to low-lying excited states. A 10% mixing of the PDR and the [2 1+× PDR] is extracted.