相对论平均场理论对Rn同位素链原子核基态性质的研究

Ground state properties of Rn isotopes within the relativistic mean field theory

在相对论平均场理论的框架下,对Rn同位素链原子核的结合能、形变、同位素位移等若干基态性质进行了较详细的研究.结果表明,理论计算结果与已有的实验数据符合较好.原子核的四极形变主要出现在远离幻数的区域(N=110—124和N=129—142).而在中子数大于幻数的区域(N=127—142),十六级形变也非常明显.对电荷半径的研究显示,Rn同位素链的同位素位移曲线的斜率在中子幻数处出现明显的变化.

The ground state properties of Rn isotopes are studied within the framework of relativistic mean field theory.The pairing correlation is treated by the BCS method.The calculation results are in good agreement with the experimental data.The quadrupole deformations can be founded mainly in the regions with neutron number far from magic number （N=110—124） and （N=129—142）.In the regions where the neutron number is larger than the magic number（N=127—142）,the hexadecapole deformations are also significant.The isotope shift for Rn isotope is also studied and a drastic change in the slope of the curve is found near the magic neutron nuclei.