N = 28壳层闭合体的侵蚀：形状共存和相变
Erosion of N = 28 shell closure: Shape coexistence and monopole transition
摘要：
背景资料：在42Si附近的丰中子核中，N = 28壳层间隙的淬灭发生，预计将诱导它们的激发谱中的形状共存。目的：方法：采用反对称分子动力学和Gogny D1S密度泛函方法，在不对核形状作特别假设的情况下，对N = 28的同位素40 Mg，42 Si和44 S的形状共存现象进行了描述.结果如下：我们发现，40Mg和42Si的基态和第一激发0+态中存在不同形变的刚性形状，而在44S中，这些态表现出大幅度的集体运动，没有任何特定的形状。这些特征在相变强度中得到了很好的反映。结论：N = 28的壳层间隙的淬灭导致了N = 28的同素核中的独特形状共存，这可以通过跃迁强度来探测。
英文摘要：
Background: In neutron-rich nuclei neighboring 42Si, the quenching of the N = 28 shell gap occurs and is expected to induce the shape coexistence in their excitation spectra. Purpose: We show that different nuclear shapes coexist in N = 28 isotones 40Mg, 42Si, and 44S, and investigate observables to probe it. Method: Antisymmetrized molecular dynamics with Gogny D1S density functional is applied to describe the shape coexistence phenomena without ad hoc assumption of the nuclear shape. Results: We find that rigid shapes with different deformations coexist in the ground and the first excited 0+ states of 40Mg and 42Si, while in 44S the states exhibit large-amplitude collective motion, which does not have any particular shape. These characteristics are reflected well in the monopole transition strengths. Conclusion: The quenching of the N = 28 shell gap leads to the unique shape coexistence in the N = 28 isotones, which can be probed by the monopole transition strengths.
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