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在相对论平均场理论下,采用NL3参数研究了12B和它的子核的性质。计算结果表明:12B的一个激发态是一个中子晕核态,它的中子密度分布有很长的拖尾,处在2S1/2态的晕中子有很小的分离能,它的均方根半径几乎是物质半径的两倍。可以看出,核的晕结构可能是松散结合核的普遍性质。当结合能变小时,被结合的外层核子趋于填在低角动量的态,因而在这些核中的晕中子的波函数有很大的空间分布,这些核子形成围绕在核芯外的晕。这种图像经常出现在滴线附近核的基态,但也可能出现在上面讨论的一些核的激发态。12B核的激发态是
Under the theory of relativistic mean field, the properties of 12B and its sub-nuclei are studied by NL3 parameters. The calculated results show that one excited state of 12B is a neutron nucleation state, and its neutron density distribution has a long tail. The halo neutron in 2S1 / 2 state has a very small separation energy. Both of them The root radius is almost twice the radius of the material. It can be seen that the halo structure of the nucleus may be the universal nature of loosely bound nuclei. As the binding energy becomes smaller, the bound outer nuclei tend to fill the low-angular momentum state so that the wave functions of the halo neutrons in these nuclei have a large spatial distribution that surrounds the core gosh. Such images often appear in the ground state of the nuclei near the drip line, but may also occur at some of the nuclear excited states discussed above. 12B nuclear excited state is