Is the nuclear spin-orbit interaction changing with neutron excess?
Is the nuclear spin-orbit interaction changing with neutron excess?
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DOI：
10.1103/physrevlett.92.162501
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发表时间：
2004-04
影响因子：
8.6
通讯作者：
J. Schiffer;S. Freeman;J. Caggiano;C. Deibel;A. Heinz;C. Jiang;R. Lewis;A. Parikh;P. Parker
中科院分区：
文献类型：
--
作者：
J. Schiffer;S. Freeman;J. Caggiano;C. Deibel;A. Heinz;C. Jiang;R. Lewis;A. Parikh;P. Parker
在Z=50闭合质子壳层外的两个无节点单粒子轨道对应的最低态能量差h（11/2）和g（7/2）随着中子的过剩而增大。我们测量了所有七种稳定的均匀Sn同位素的Sn（α,t）反应，发现这两种状态的光谱因子是恒定的，证实了它们作为单粒子状态的表征。能量的变化趋势与核自旋轨道相互作用的减弱是一致的。在N=82核外的中子单粒子态i（13/2）和h（9/2）的能量中可以看到类似的趋势，也表明自旋轨道分裂在减少。
The difference in the energies of the lowest states corresponding to the two nodeless single-particle orbitals outside the Z=50 closed proton shell, h(11/2) and g(7/2), increases with neutron excess. We have measured the Sn(alpha,t) reaction for all seven stable even Sn isotopes and found that the spectroscopic factors are constant for these two states, confirming their characterization as single-particle states. The trend in energies is consistent with a decrease in the nuclear spin-orbit interaction. A similar trend, also suggesting a decreasing spin-orbit splitting, is seen in the energies of the neutron single-particle states outside the N=82 core, i(13/2) and h(9/2).