Multi-messenger investigation of the Pygmy Dipole Resonance in 140Ce
Multi-messenger investigation of the Pygmy Dipole Resonance in 140Ce
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DOI：
10.1016/j.physletb.2018.09.025
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发表时间：
2018-11
影响因子：
4.4
通讯作者：
D. Savran;V. Derya;S. Bagchi;J. Endres;M. Harakeh;J. Isaak;N. Kalantar-Nayestanaki;E. Lanza;B. Loeher;A. Najafi;S. Pascu;S. Pickstone;N. Pietralla;V. Ponomarev;C. Rigollet;C. Romig;M. Spieker;A. Vitturi;A. Zilges
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文献类型：
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作者：
D. Savran;V. Derya;S. Bagchi;J. Endres;M. Harakeh;J. Isaak;N. Kalantar-Nayestanaki;E. Lanza;B. Loeher;A. Najafi;S. Pascu;S. Pickstone;N. Pietralla;V. Ponomarev;C. Rigollet;C. Romig;M. Spieker;A. Vitturi;A. Zilges
本文报道了在ep = 80 MeV条件下的首次（p, p′γ）实验，研究了140 Ce半幻核中的侏儒偶极子共振（PDR）。本实验是一系列实验中最新的一项，该实验利用不同的互补探针来研究PDR，以提供关于140 Ce中PDR特性的多信使数据集。此外，在准粒子声子模型（QPM）内进行了计算。根据从QPM得到的跃迁密度计算了质子和α-散射反应的截面，不仅在RPA水平上，而且包括了高达3p-3h构型的整个模型空间。这使得第一次可以在绝对尺度上对单激发的计算结果与实验结果进行比较。QPM与实验结果吻合，证明了PDR各态跃迁密度的计算精度较高。
We report on the first (p, p′ γ) experiments at E p= 80 MeV to investigate the Pygmy Dipole Resonance (PDR) in the semi-magic nucleus 140 Ce. This experiment is the latest in a series of experiments to investigate the PDR with different complementary probes to provide a multi-messenger data set on the properties of the PDR in 140 Ce. In addition, calculations within the Quasi-particle Phonon Model (QPM) have been performed. Cross sections have been calculated for proton-as well as α-scattering reactions based on the transition densities obtained from the QPM, not only at the RPA level, but including the full model space of up to 3p–3h configurations. This allows for the first time to compare the calculations to the experimental results on an absolute scale for single excitations. Agreement between QPM and experiment is observed, which proves the high accuracy of the calculated transition densities for individual PDR states.