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arXiv 1002.3309nucl-th
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密度相关相对论Hartree-Fock理论中Dirac负能谱的自旋对称性

Spin symmetry in Dirac negative energy spectrum in density-dependent relativistic Hartree-Fock theory

Haozhao Liang, Wen Hui Long, Jie Meng, Nguyen Van Giai

摘要:

在密度依赖的相对论Hartree-Fock(DDRHF)理论框架下,首次研究了Dirac负能谱中的自旋对称性及其起源.以核$^{16}$ O为例,发现负能谱中的自旋对称性是一个很好的近似,自旋二重态的狄拉克波函数的主导分量几乎相同.相对论性Hartree近似的自旋对称性来源于标量势和矢量势的相等,而DDRHF中Hartree项和Fock项的抵消导致了更好的自旋对称性,并决定了精细的自旋轨道分裂。即使在介子-反核子耦合的G-宇称值发生显著偏离的情况下,这些结论也成立。

英文摘要:

The spin symmetry in the Dirac negative energy spectrum and its origin are investigated for the first time within the density-dependent relativistic Hartree-Fock (DDRHF) theory. Taking the nucleus $^{16}$O as an example, the spin symmetry in the negative energy spectrum is found to be a good approximation and the dominant components of the Dirac wave functions for the spin doublets are nearly identical. In comparison with the relativistic Hartree approximation where the origin of spin symmetry lies in the equality of the scalar and vector potentials, in DDRHF the cancellation between the Hartree and Fock terms is responsible for the better spin symmetry properties and determines the subtle spin-orbit splitting. These conclusions hold even in the case when significant deviations from the G-parity values of the meson-antinucleon couplings occur.

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