论文标题
关于在8HE中可能存在软偶极子模式
On the possible existence of a soft dipole mode in 8He
论文作者
论文摘要
n/z = 3的极端中子与普罗替子比例为8HE提供了研究多种外来现象的理想实验室，例如，柔软的偶极模式的出现以转变为连续体。在此贡献中，协变量功能理论（DFT）框架用于计算地面特性和8HE的偶极响应。尽管公认的8人太轻了，无法适用DFT，但该方法的最大优点是，与中心运动相关的虚假污染保证可以使身体反应与身体反应相矛盾。考虑到具有如此较大的中子蛋白不对称的系统，等值器偶极模式之间的强烈混合期望像8HE一样，因此在Isovector偶极响应中出现在低能的狭窄结构归因于潮气强度向零（或接近零）激发能量的转移。因此，这里实施的理论框架不散发出8HE中软偶极模式的出现。
With an extreme neutron-to-proton ratio of N/Z=3, 8He provides an ideal laboratory for the study of a variety of exotic phenomena, such as the emergence of a soft dipole mode that is dominated by transitions into the continuum. In this contribution, a covariant density functional theory (DFT) framework is used to compute ground-state properties and the dipole response of 8He. Although 8He is admittedly too light for DFT to be applicable, the great merit of the approach is that the spurious contamination associated with the center-of-mass motion is guaranteed to decouple from the physical response. Given that a strong mixing between the isoscalar and isovector dipole modes is expected for a system with such a large neutron-proton asymmetry as 8He, the narrow structures that emerged at low energies in the isovector dipole response are attributed to the shift of the spurious strength to zero (or near zero) excitation energy. Thus, the theoretical framework implemented here disfavors the emergence of a soft dipole mode in 8He.
