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

作　　者：茅广军[1] 

机构地区：[1]中国科学院高能物理研究所

出　　处：《高能物理与核物理》2003年第8期692-697,共6页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金(10275072);中国科学院留学经费择优支持回国工作基金

摘　　要：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.

关 键 词：核子 反核子 束缚态 张量相互作用 相对论Hartree模型 矢量介子 张量耦合 真空反核子能谱 相对论量子场论 多体问题 

分 类 号：O413.1[理学—理论物理]