Ab initio symmetry-adapted emulator for studying emergent collectivity and clustering in nuclei
Ab initio symmetry-adapted emulator for studying emergent collectivity and clustering in nuclei
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DOI：
10.3389/fphy.2023.1064601
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发表时间：
2023-03
期刊：
影响因子：
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通讯作者：
K. S. Becker;K. Launey;A. Ekstrom;T. Dytrych
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文献类型：
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作者：
K. S. Becker;K. Launey;A. Ekstrom;T. Dytrych
我们讨论模拟器从头算适应无核壳模型框架研究的α集群和集体性质的形成，没有有效的费用。我们提出了一种新型的仿真器，一个利用本征向量延拓技术，但基于使用辛对称的考虑。这是通过使用物理上相关的自由度，即，核适应的基础，它利用了几乎完美的辛对称核。具体来说，我们研究了激发能，点质子均方根半径，沿着与电四极矩和过渡为6Li和12 C。我们发现，用于训练仿真器的手征势的参数化的集合对主导核特征的预测没有显着影响，例如形状和相关的辛对称性，沿着与集群形成，但略有不同的细节，影响集体四极矩，渐近归一化系数，和α部分宽度高达两个因素。这使得这些类型的仿真器对于进一步约束核力以获得高精度的核结构和反应可观测值非常重要。
We discuss emulators from the ab initio symmetry-adapted no-core shell-model framework for studying the formation of alpha clustering and collective properties without effective charges. We present a new type of an emulator, one that utilizes the eigenvector continuation technique but is based on the use of symplectic symmetry considerations. This is achieved by using physically relevant degrees of freedom, namely, the symmetry-adapted basis, which exploits the almost perfect symplectic symmetry in nuclei. Specifically, we study excitation energies, point-proton root-mean-square radii, along with electric quadrupole moments and transitions for 6Li and 12C. We show that the set of parameterizations of the chiral potential used to train the emulators has no significant effect on predictions of dominant nuclear features, such as shape and the associated symplectic symmetry, along with cluster formation, but slightly varies details that affect collective quadrupole moments, asymptotic normalization coefficients, and alpha partial widths up to a factor of two. This makes these types of emulators important for further constraining the nuclear force for high-precision nuclear structure and reaction observables.