Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
Phys Rev Lett. 2023 Jan 20;130(3):032501. doi: 10.1103/PhysRevLett.130.032501.
The neutron skin of atomic nuclei impacts the structure of neutron-rich nuclei, the equation of state of nucleonic matter, and the size of neutron stars. Here we predict the neutron skin of selected light- and medium-mass nuclei using coupled-cluster theory and the auxiliary field diffusion Monte Carlo method with two- and three-nucleon forces from chiral effective field theory. We find a linear correlation between the neutron skin and the isospin asymmetry in agreement with the liquid-drop model and compare with data. We also extract the linear relationship that describes the difference between neutron and proton radii of mirror nuclei and quantify the effect of charge symmetry breaking terms in the nuclear Hamiltonian. Our results for the mirror-difference charge radii and binding energies per nucleon agree with existing data.
原子核的中子皮影响富含中子核的结构、核子物质的状态方程以及中子星的大小。在这里，我们使用手征有效场理论的两体和三体核力，通过关联簇理论和辅助场扩散蒙特卡罗方法来预测选定的轻核和中核的中子皮。我们发现，中子皮与同位旋不对称性之间存在线性关系，这与液滴模型一致，并与数据进行了比较。我们还提取了描述镜像核中子和质子半径差的线性关系，并量化了核哈密顿量中电荷对称破缺项的影响。我们对镜像核电荷半径和每核子结合能的结果与现有数据一致。
