轻核区双中子滴线核的研究

圣宗强; 郭建友

doi:10.11804/NuclPhysRev.25.02.117

轻核区双中子滴线核的研究

Study of Twoneutron Drip Line Nuclei in Region of Light Nuclei

摘要

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 eveneven O， Ne， Mg， Si， S， Ar， Ca and Ni isotopes were studied with the selfconsistent 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 twoneutron separation energies were in good agreement with experimental values. By examining the twoneutron separation energies， it was suggested that ³⁰O， ³⁸Ne， ⁴²Mg， ⁵²Si， ⁵⁴S， ⁶⁰Ar， ⁸⁰Ca and 98Ni are the twoneutron 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; twoneutron separation energy

Abstract: The ground state properties of eveneven O， Ne， Mg， Si， S， Ar， Ca and Ni isotopes were studied with the selfconsistent 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 twoneutron separation energies were in good agreement with experimental values. By examining the twoneutron separation energies， it was suggested that ³⁰O， ³⁸Ne， ⁴²Mg， ⁵²Si， ⁵⁴S， ⁶⁰Ar， ⁸⁰Ca and 98Ni are the twoneutron 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; twoneutron separation energy

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