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采用反射不对称相对论平均场(Reflection Asymmetric Relativistic Mean Field,RAS-RMF)理论研究了226Th和216Th原子核的基态性质.通过改变RAS-RMF理论计算中双中心谐振子基的不对称系数δ3、形变参数δ2以及基大小参数N,探讨了基参数的变化对计算结果的影响.结果表明:双中心谐振子基参数的改变对RAS-RMF计算结果都存在稳定的区间,在这个稳定区间里,RAS-RMF计算结果与实验数据以及有限力程小液滴模型(FRDM)计算结果一致.尤其是反射不对称自由度的引入,改进了相对论平均场的理论计算,给出了与实验更加符合的结果,表明RAS-RMF理论对描述具有反射不对称形变的原子核更具优越性.
The ground state properties of 226Th and 216Th nuclei are investigated by using the theory of Reflection Asymmetric Relativistic Mean Field (RAS-RMF). By changing the asymmetry coefficient δ3 of the bidentate resonance center in RAS-RMF theory, the deformation parameters δ2, and the base size parameter N, the influence of the change of base parameters on the calculation results is discussed. The results show that there are stable intervals for the calculation results of RAS-RMF with the change of bistatic harmonic oscillator base parameters. In this stable interval, The calculation results of RMF are consistent with the experimental data and the finite-droplet small droplet model (FRDM) .In particular, the introduction of reflection asymmetry degree of freedom improves the theoretical calculation of the relativistic mean field and gives more consistent results with the experiment, It shows that the RAS-RMF theory is superior to the description of nuclei with asymmetric reflection reflections.