Shape coexistence in 94 Zr studied via Coulomb excitation
Shape coexistence in 94 Zr studied via Coulomb excitation
复制标题
通过库仑激发研究 94 Zr 的形状共存
DOI：
10.1051/epjconf/201922301038
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发表时间：
2019
影响因子：
--
通讯作者：
Marchini N
中科院分区：
文献类型：
--
作者：
Marchini N
近年来，围绕锆同位素链进行了许多理论和实验研究。特别是，最先进的蒙特卡罗壳模型计算可以预测这些同位素的形状共存。在这种情况下，被认为具有接近球形基态的 94 Zr 核特别有趣，因为所谓的变形结构是基于低位 0 2 + 态，使其适合详细研究。为了对低能态的形状提供明确的结论，进行了两个利用低能库仑激发研究 94Zr 的互补实验。该数据将允许提取 21,2+ 能级的四极矩以及确定 01,2+ 态的变形参数，从而首次对该核中形状共存的作用得出明确的结论。 第一个实验是在 INFN Legnaro 国家实验室使用 GALILEO-SPIDER 设置进行的，该设置首次与 6 个溴化镧闪烁体 (LaBr3:Ce) 以最大限度地提高 γ 射线探测效率。第二个实验在慕尼黑迈尔莱布尼茨实验室（MLL）进行，并使用 Q3D 磁谱仪检测 94 Zr 靶材库仑激发后散射的 12 C 离子。
In recent years, a number of both theoretical and experimental investigations have been performed focusing on the zirconium isotopic chain. In particular, state-of-the-art Monte Carlo shell-model calculations predict shape coexistence in these isotopes. In this context, the94Zr nucleus, which is believed to possess a nearly spherical ground state, is particularly interesting since the purported deformed structure is basedon the low-lying 02+state, making it amenable for detailed study. In order to provide definitive conclusionson the shapes of the low-lying states, two complementary experiments to study94Zr by means of low-energy Coulomb excitation were performed. This data will allow the quadrupole moments of the 21,2+levels to be extracted as well as for the deformation parameters of the 01,2+states to be determined and, thus, definitive conclusions to be drawn on the role of shape coexistence in this nucleus for the first time.The first experiment was performed at the INFN Legnaro National Laboratory with the GALILEO-SPIDER setup, which, for the first time, was coupled with 6 lanthanum bromide scintillators (LaBr3:Ce) in order to maximize theγ-ray detection effciency. The second experiment was performed at the Maier-Leibnitz Laboratory (MLL) in Munich and used a Q3D magnetic spectrograph to detect the scattered12C ions following Coulomb excitation of94Zr targets.