张量相互作用对核子和反核子束缚态的效应

Effect of Tensor Interactions on the Nucleon and Anti-Nucleon Bound States

由于量子真空对密度的贡献,在有限核的相对论Hartree模型中核子有效质量为0.8M_N左右,导致自旋轨道力仅是实验值的三分之一,本文通过引入矢量介子的张量耦合项,使自旋轨道力增加了一倍,同时保持有效质量不变,相应的核子能谱与实验值的符合得到明显改进,而预言的真空反核子位阱深度增大了20—30MeV。

Due to the contributions of the quantum vacuum to densities, the relativistic Hartree approach for finite nuclei produces a large effective nucleon mass m IMN≈0.8, which causes the spin-orbit force to be only 1/3 of the empirical value. In this work we introduce tensor couplings for the vector mesons. Consequently, the spin-orbit force is enhanced by a factor of 2 while a large effective nucleon mass remains. The nucleon spectra of shell-model states are ameliorated evidently. The predicted anti-nucleon spectra in the vacuum are deepened about 20-30MeV.