AI 中文总结
本研究通过从头算方法结合多种核结构理论，阐明了$^{16}$O与$^{20}$N中不同多体关联对四极形变的补偿机制，解释了经典转子近似的成功，为解读重离子碰撞数据提供了定量基础。
AI 中文摘要
超相对论重离子碰撞中测得的强子方位流为成像原子核基态的多极关联提供了新手段。早期解读主要依赖经典转子图像，其中测得的均方椭圆流与本征四极形变直接相关。然而，原子核包含由泡利不相容原理、集体形状涨落和非集体动力学过程产生的额外多体关联，其对该对应关系的影响尚未阐明。本文通过基于手征核相互作用对$^{16}$O和$^{20}$N进行从头算分析，结合介质中相似重整化群与量子数投影生成坐标法，解决了该问题。通过依次分离反对称化、集体转动与振动以及非集体动力学关联，首次确定各成分对均方四极偏心率的贡献。我们发现这些不同关联机制间存在意外补偿：尽管各成分贡献显著，从椭圆流推断的平方有效四极形变仍接近原子核的平方本征形变。该结果为经典转子近似的惊人成功提供了微观解释，并为解读大型强子对撞机近期采集的$^{16}$O+$^{16}$O与$^{20}$Ne+$^{20}$Ne碰撞数据奠定了定量基础。
英文摘要
Azimuthal hadronic flow measured in ultra-relativistic ion--ion collisions provides a new means of imaging multipole correlations in the ground state of atomic nuclei. Early interpretations largely relied on a classical-rotor picture, in which the measured mean-square elliptic flow is directly related to an intrinsic quadrupole deformation. Atomic nuclei, however, contain additional many-body correlations generated by the Pauli exclusion principle, collective shape fluctuations and non-collective dynamical processes, whose impact on this correspondence has not yet been elucidated. Here, we resolve this issue through an ab initio analysis of $^{16}$O and $^{20}$Ne based on chiral nuclear interactions, combining the in-medium similarity renormalization group with the quantum-number-projected generator coordinate method. By successively isolating antisymmetrization, collective rotational and vibrational, and non-collective dynamical correlations, we determine, for the first time, how each component contributes to the mean-square quadrupole eccentricity. We uncover an unexpected compensation among these distinct correlation mechanisms: despite sizable individual contributions, the squared effective quadrupole deformation inferred from the elliptic flow remains close to the square intrinsic deformation of the nucleus. This result provides a microscopic explanation for the surprising success of the classical-rotor approximation and establishes a quantitative foundation for interpreting $^{16}$O+$^{16}$O and $^{20}$Ne+$^{20}$Ne collision data recently collected at the Large Hadron Collider.
Comments5+1 pages with 3+3 figures, suggestions and comments are welcome
