我们利用一个简单的核子-核子相互作用对$^{12}$ C的低激发能谱进行了晶格计算,该相互作用与自旋和同位旋无关,因此在Wigner的SU(4)对称性下是不变的。我们发现强信号的所有激发态高达$\sim 15$ ~MeV以上的基态,并探讨每个国家使用各种各样的$α$集群和谐振子试验状态,投影到给定的不可约表示的立方群的结构。我们能够验证早期的发现$α$聚类在霍伊尔状态和第二个$2^+$状态的$^{12}$ C。这些成功的计算,以描述完整的低位能谱使用自旋无关的相互作用表明,无论是自旋轨道相互作用是有点弱的$^{12}$ C系统,或$α$集群的影响正在减少他们的影响。这与{ \it ab initio}壳模型计算的先前发现一致。
英文摘要:
We present lattice calculations of the low-lying spectrum of $^{12}$C using a simple nucleon-nucleon interaction that is independent of spin and isospin and therefore invariant under Wigner's SU(4) symmetry. We find strong signals for all excited states up to $\sim 15$~MeV above the ground state, and explore the structure of each state using a large variety of $α$ cluster and harmonic oscillator trial states, projected onto given irreducible representations of the cubic group. We are able to verify earlier findings for the $α$ clustering in the Hoyle state and the second $2^+$ state of $^{12}$C. The success of these calculations to describe the full low-lying energy spectrum using spin-independent interactions suggest that either the spin-orbit interactions are somewhat weak in the $^{12}$C system, or the effects of $α$ clustering are diminishing their influence. This is in agreement with previous findings from {\it ab initio} shell model calculations.
Wigner symmetry in the limit of large scattering lengths
我们注意到,在NN 1 S 0和3S 1散射长度a^(1 S 0)和a^(3S 1)趋于无穷大的极限下,强NN相互作用的有效场论中的主导项在Wigner的SU(4)自旋-同位旋对称性下是不变的。这解释了为什么辐射π介子对S波NN散射振幅的主导作用随着a^(1 S 0)和a^(3S 1)趋于无穷大而消失。维格纳对称NN NN轴子和伽玛d到NP的影响也被认为是。
Wigner symmetry, Large Nc and Renormalized One Boson Exchange Potential
核物理学中的维格纳对称性提供了一个非微扰长距离对称性的独特例子,这种对称性在短距离内强烈破缺。我们分析这样一个概念的框架内的一个玻色子交换潜力NN散射和保持领先的NC贡献的后果。在整个弹性区域中提供了单重态1 S 0和三重态3S 1散射相移之间的现象学上成功的关系。我们建立了对称性破缺关系的非中心相移,这是成功地实现了偶数-L分波和强烈违反奇数-L分波,完全符合大NC的要求。
Unmasking Hidden Wigner's Symmetry from First Principles
Louisiana State University(路易斯安那州立大学);Czech Technical University(捷克理工大学);Quantum CodeX(量子代码X);Nuclear Physics Institute, Academy of Sciences of the Czech Republic(捷克科学院核物理研究所)
Quantum Resources and Wigner Symmetry in Nucleon-Nucleon Scattering from Effective Field Theory
Northwestern University(西北大学);Argonne National Laboratory(阿贡国家实验室);University of California, Berkeley(加州大学伯克利分校);Lawrence Berkeley National Laboratory(劳伦斯伯克利国家实验室);CERN(欧洲核子研究中心);Universität Zürich(苏黎世大学)
Minimal Wigner-$SU(4)$ Interaction in Microscopic Cluster Models for $α$-Conjugate Nuclei
Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Institute of Modern Physics, Fudan University(复旦大学现代物理研究所);College of Mechanics and Engineering Science, Hohai University(河海大学力学与工程学院);Shanghai Research Center for Theoretical Nuclear Physics, NSFC and Fudan University(国家自然科学基金委与复旦大学理论核物理上海研究中心);School of Physics, East China Normal University(华东师范大学物理系)
Coupling and Recoupling Coefficients for Wigner's U(4) Supermultiplet Symmetry
Louisiana State University(路易斯安那州立大学);Quantum CodeX(量子代码X);Liaoning Normal University(辽宁师范大学);Nuclear Physics Institute, Academy of Sciences of the Czech Republic(捷克科学院核物理研究所);Czech Technical University(捷克技术大学)