论文标题
外来霓虹灯和镁同位素的电荷半径
Charge radii of exotic neon and magnesium isotopes
论文作者
论文摘要
我们计算从中子数n = 8到滴管的均质霓虹灯和镁同位素的电荷半径。我们的计算基于手性有效场理论中的核子核子和三核电势，其中包括三角洲等球。这些电势产生核物质的准确饱和点和对称能。我们使用耦合群集方法，并从轴向对称的参考状态开始。结合能和两种中子分离能在很大程度上与数据一致，而霓虹灯中的滴灌非常准确。计算的电荷半径的估计不确定性约为2-3％，对于存在数据存在的许多同位素是准确的。但是，诸如同位素偏移之类的细节尚未准确复制。手性电位正确地产生了n = 14时的子壳闭合，并且在n = 8时的电荷半径下降（在霓虹灯中观察到，预测镁）。随着中子的添加超过n = 14，它们持续增加了电荷半径，但低估了镁的n = 20时大幅增加。
We compute the charge radii of even-mass neon and magnesium isotopes from neutron number N = 8 to the dripline. Our calculations are based on nucleon-nucleon and three-nucleon potentials from chiral effective field theory that include delta isobars. These potentials yield an accurate saturation point and symmetry energy of nuclear matter. We use the coupled-cluster method and start from an axially symmetric reference state. Binding energies and two-neutron separation energies largely agree with data and the dripline in neon is accurate. The computed charge radii have an estimated uncertainty of about 2-3% and are accurate for many isotopes where data exist. Finer details such as isotope shifts, however, are not accurately reproduced. Chiral potentials correctly yield the subshell closure at N = 14 and also a decrease in charge radii at N = 8 (observed in neon and predicted for magnesium). They yield a continued increase of charge radii as neutrons are added beyond N = 14 yet underestimate the large increase at N = 20 in magnesium.
