发表机构
University of York; The Hebrew University; Tel Aviv University; Universitat de Barcelona; Institut de Ciencies del Cosmos, Universitat de Barcelona; Università degli Studi di Milano; INFN, Sezione di Milano; Technische Universität Darmstadt; GSI Helmholtzzentrum für Schwerionenforschung; Helmholtz Forschungsakademie Hessen für FAIR (HFHF)（约克大学; 希伯来大学; 特拉维夫大学; 巴塞罗那大学; 巴塞罗那大学宇宙科学研究所; 米兰大学; 意大利国家核物理研究所米兰分部; 达姆施塔特工业大学; 亥姆霍兹重离子研究中心; 黑森亥姆霍兹FAIR研究学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究提出密度重叠框架，利用能量密度泛函的完整密度分布构建短程关联对源项，预测富中子氧同位素的中子-中子对丰度演化，并将质子-质子与中子-中子对比率确立为探测中子皮厚度及核状态方程的新探针。
AI 中文摘要
我们研究了短程关联（SRCs）的观测核系统学在多大程度上可以由底层质子和中子密度分布的几何形状来描述。基于先前核SRC接触与单体密度之间的联系，我们提出了一种显式的密度重叠表示，其中质子-质子、质子-中子和中子-中子SRC源项由通过能量密度泛函（EDFs）获得的完整空间密度分布构建。该框架包含两个全局参数，分别描述整体SRC对形成强度和自旋单态通道的相对贡献，而依赖于原子核的演化则由密度重叠积分产生。该框架同时再现了多个独立的实验SRC观测量，包括质子-质子与质子-中子对的比率、相对SRC对丰度以及质子和中子高动量双比率。相对论性与Skyrme型EDF族之间的比较表明，这些观测量对底层密度几何形状的敏感性，并允许将完整密度分布的影响与基于简单半径的几何估计区分开来。应用于富中子氧同位素时，该框架预测了中子-中子对丰度的显著演化。与基于占据谐振子波函数和显式有限距离判据的独立计算的比较，支持了富中子氧同位素中预测的同位素演化。这一一致性表明，质子-质子与中子-中子SRC对比率是富中子核中中子皮厚度的有前景的实验探针，并通过它们与对称能的联系，成为核状态方程的探针。
英文摘要
We investigate to what extent the observed nuclear systematics of Short-Range Correlations (SRCs) can be described by the geometry of the underlying proton and neutron density distributions. Building on previous connections between nuclear SRC contacts and one-body densities, we formulate an explicit density-overlap representation in which proton--proton, proton--neutron, and neutron--neutron SRC source terms are constructed from the full spatial density profiles obtained with Energy Density Functionals (EDFs). The framework contains two global parameters describing the overall SRC pair formation strength and the relative contribution of the spin-singlet channel, while the nucleus-dependent evolution is generated by the density-overlap integrals. The framework simultaneously reproduces several independent experimental SRC observables, including proton--proton to proton--neutron pair ratios, relative SRC pair abundances, and proton and neutron high-momentum double ratios. A comparison between relativistic and Skyrme-type EDF families demonstrates the sensitivity of these observables to the underlying density geometry and allows the effect of the complete density profiles to be distinguished from simple radius-based geometrical estimates. Applied to neutron-rich oxygen isotopes, the framework predicts a pronounced evolution of the neutron--neutron pair abundance. Comparison with an independent calculation based on occupied harmonic-oscillator wave functions and an explicit finite-distance criterion supports the predicted isotopic evolution in neutron-rich oxygen isotopes. This agreement identifies the proton--proton to neutron--neutron SRC pair ratio as a promising experimental probe of neutron-skin thicknesses in neutron-rich nuclei and, through their connection to the symmetry energy, of the nuclear equation of state.
Comments7 pages, 5 figures
