论文标题
n = 28壳闭合的侵蚀：形状共存和单极过渡
Erosion of N = 28 shell closure: Shape coexistence and monopole transition
论文作者
论文摘要
背景：在相邻42SI的富含中子的核中，发生n = 28壳间隙的淬灭，并有望在其激发光谱中诱导形状共存。目的：我们表明，在n = 28异素酮40mg，42si和44s中共存的不同核形状并存，并调查可观察物以探测它。方法：具有GOGNY D1S密度功能的反对称分子动力学可描述形状共存现象，而无需临时假设核形状。结果：我们发现，地面上具有不同变形的刚性形状，而第一个激发的0+状态为40mg和42si，而在44S中，状态表现出较大的振幅集体运动，没有任何特定的形状。这些特征在单极过渡强度中很好地反映了。结论：n = 28壳间隙的淬灭导致n = 28同位素的独特形状共存，可以通过单极过渡强度探测。
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.
