The spin-orbit splitting between neutron 1 orbitals at Si has been deduced using the single-neutron-adding (,) reaction in inverse kinematics with a beam of Si, a long-lived radioisotope. Reaction products were analyzed by the newly implemented SOLARIS spectrometer at the reaccelerated-beam facility at the National Superconducting Cyclotron Laboratory. The measurements show reasonable agreement with shell-model calculations that incorporate modern cross-shell interactions, but they contradict the prediction of proton density depletion based on relativistic mean-field theory. The evolution of the neutron 1-shell orbitals is systematically studied using the present and existing data in the isotonic chains of , 19, and 21. In each case, a smooth decrease in the separation of the - orbitals is seen as the respective -orbitals approach zero binding, suggesting that the finite nuclear potential strongly influences the evolution of nuclear structure in this region.

中文翻译：

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使用 SOLARIS 通过 32Si(d,p)33Si 反应探索核自旋轨道分裂的演化


Si 处中子 1 轨道之间的自旋轨道分裂是通过使用长寿命放射性同位素 Si 束进行逆运动学中的单中子添加 (,) 反应推导出来的。反应产物由国家超导回旋加速器实验室再加速束设施中新安装的 SOLARIS 光谱仪进行分析。测量结果与包含现代跨壳相互作用的壳模型计算结果相当一致，但它们与基于相对论平均场理论的质子密度损耗预测相矛盾。使用 、 19 和 21 等渗链中当前和现有的数据系统地研究了中子 1 壳层轨道的演化。在每种情况下，- 轨道间隔的平滑减小被视为各自的 - 轨道接近零结合，表明有限的核势强烈影响该区域核结构的演化。