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手征胶子修正夸克平均场模型
Pion and Gluon Corrections on Quark Mean Field Model
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摘要: 这项工作利用考虑π介子与胶子效应的夸克平均场模型研究原子核结构的基本性质.在夸克平均场中,核子由三个束缚在谐振子势场中的组分夸克构成.描述强相互作用的量子色动力学必须满足手征对称性,此外夸克之间也需要通过交换胶子相互作用.因此,在夸克平均场模型中,对利用夸克势获得的核子质量考虑π介子修正与胶子修正.通过少数稳定有限核的结合能与半径实验值确定模型中的未知参数,获得了一组夸克平均场相互作用参数,QMF-NK.利用该组参数计算40Ca和208pb的电荷密度分布,发现与实验值符合很好.随后获得了与经验值一致的对称核物质的饱和性质.包含π介子修正和胶子修正的夸克平均场模型能够更好地描述有限核和核物质的性质.Abstract: The basic properties of nuclear structure are studied within the quark mean field (QMF) model by taking the effects of pions and gluons into account.In QMF,the nucleon is made up of three constituent quarks confined by a harmonic oscillator potential.The quantum chromodynamics describing the strong interaction must satisfy the chiral symmetry and quarks interact with each other through exchange of gluons.Therefore pion correction and gluon correction are included in the nucleon mass obtained by using quark confinement potential in quark mean field model.We determine the unknown parameters in the model by fitting the experimental data of the binding energies and radii of several stable finite nuclei and obtain a set of parameters of quark mean field interaction,named QMF-NK.The charge density distributions of 40Ca and 208pb are calculated,which are in good agreement with the experimental data.Later the saturation properties of symmetric nuclear matter which are consistent with the empirical data are obtained.With the pion and gluon corrections,the QMF model could treat finite nuclei and nuclear matter better.
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