Tensor Coupling Effects on Spin Symmetry in the Anti-Lambda Spectrum of Hypernuclei
Tensor Coupling Effects on Spin Symmetry in the Anti-Lambda Spectrum of Hypernuclei
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DOI：
10.1088/0256-307x/28/9/092101
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发表时间：
2010-04
影响因子：
3.5
通讯作者：
Chunyan Song;Jiangming Yao;J. Meng
中科院分区：
文献类型：
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作者：
Chunyan Song;Jiangming Yao;J. Meng
利用相对论平均场理论研究了Λω张量耦合对Λ核系统中Λ谱自旋对称性的影响。以12 C +Λ为例，发现张量耦合使Λ的自旋轨道分裂增大了5倍，但对Λ的波函数影响很小。在其他的Λ-核中也观察到类似的结果，包括16 O +Λ，40 Ca +Λ和208 Pb +Λ。结果表明，在不考虑张量耦合的情况下，反λ核系统的自旋对称性仍然是一个很好的近似。
Effects of Λω-tensor coupling on the spin symmetry of Λ spectra in Λ-nucleus systems are studied using relativistic mean-field theory. Taking 12C+Λ as an example, it is found that the tensor coupling enlarges the spin-orbit splittings of Λ by a factor of 5 but has a negligible effect on the wave functions of Λ. Similar conclusions are observed in other Λ-nuclei, including 16O+Λ, 40Ca+Λ and 208Pb+Λ. It is indicated that the spin symmetry in anti-lambda-nucleus systems is still a good approximation irrespective of the tensor coupling.