Study of Twoneutron Drip Line Nuclei in Region of Light Nuclei
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摘要: 运用形变相对论平均场（RMF）理论系统地研究了轻核区的元素O， Ne， Mg， Si， S， Ar和 Ca及Ni。 计算了这8个元素的偶偶核基态的一些性质， 如结合能、 四极形变、 平均每核子结合能以及双中子分离能等。 计算中采用了NL3参数组， 并用BCS方法处理对关联。 限于篇幅， 文中只给出O和Mg元素的计算结果。 RMF理论计算的结果和实验值基本一致。 从双中子分离能的分析可知， RMF理论计算的各元素的双中子滴线核分别为 30O， 38Ne， 42Mg， 52Si， 54S， 60Ar， 80Ca和98Ni。 最后简单讨论了Ca和Ni同位素中的中子幻数情况。 The ground state properties of eveneven O， Ne， Mg， Si， S， Ar， Ca and Ni isotopes were studied with the selfconsistent deformed relativistic mean field theory with NL3 parameter set. The calculated results of O and Mg isotopes were presented in detail. The calculated binding energies and the twoneutron separation energies were in good agreement with experimental values. By examining the twoneutron separation energies， it was suggested that 30O， 38Ne， 42Mg， 52Si， 54S， 60Ar， 80Ca and 98Ni are the twoneutron drip line nuclei. We also briefly discussed the possible changes of neutron magic numbers in Ca and Ni isotopes. Key words： relativistic mean field; drip line nucleus; twoneutron separation energy
Abstract: The ground state properties of eveneven O， Ne， Mg， Si， S， Ar， Ca and Ni isotopes were studied with the selfconsistent deformed relativistic mean field theory with NL3 parameter set. The calculated results of O and Mg isotopes were presented in detail. The calculated binding energies and the twoneutron separation energies were in good agreement with experimental values. By examining the twoneutron separation energies， it was suggested that 30O， 38Ne， 42Mg， 52Si， 54S， 60Ar， 80Ca and 98Ni are the twoneutron drip line nuclei. We also briefly discussed the possible changes of neutron magic numbers in Ca and Ni isotopes. Key words： relativistic mean field; drip line nucleus; twoneutron separation energy
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