滴线附近奇异核性质的研究

INVESTIGATION OF PROPERTIES OF EXOTIC NUCLEI NEAR DRIP LINE

采用相对论Ｈａｒｔｒｅｅ－Ｆｏｃｋ（ＲＨＦ）理论来描述滴线附近奇异核的性质。为了研究Ｆｏｃｋ 项和矢量介子对奇异核性质的贡献和避免有效相互作用的不唯一性，推广应用没有自由参数的密度有关的相对论Ｈａｒｔｒｅｅ（ＲＤＨ）和Ｈａｒｔｒｅｅ－Ｆｏｃｋ（ＲＤＨＦ）理论来描述奇异核的性质。在ＲＤＨ和ＲＤＨＦ近似下，计算了钙同位素链的性质，特别研究了Ｆｏｃｋ 交换项和矢量介子的贡献。研究表明：交换项和矢量介子对非常丰中子核的性质，如结合能、中子均方根半径和中子密度分布的影响不同于对稳定线附近核性质的影响。

Relativistic Hartree Fock (RHF)theory is adopted to describe properties of exotic nuclei near drip line. In order to investigate the contribution of Fock term and isovector mesons to the properties of exotic nuclei and to avoid effective interaction which is not unique, the density dependent relativistic Hartree (RDH) and relativistic Hartree Fock (RDHF)theories without free parameter are extended to describe the properties of exotic nuclei. The properties of calcium isotope chain are calculated in the RDH and RDHF approaches, particularly, the contribution of the Fock term and isovector mesons to the properties are investigated. It turns out that the influence of the Fock term and isovector mesons on the properties of neutron very rich nuclei, such as binding energies, RMS of neutron radius, distribution of neutron density, is very different from those of stable nuclei. The importance of study on the properties of nuclei near drip line and theoretical model used in this paper are briefly discussed.