论文标题
基于相对论核能密度功能的磁偶极激发
Magnetic dipole excitations based on the relativistic nuclear energy density functional
论文作者
论文摘要
磁偶极子（M1）激发不仅建立了核次转变的基本模式，而且还与核天体物理学应用相关。我们已经建立了一个理论框架来描述基于相对论核能密度功能的M1转变。为此，使用密度依赖点耦合相互作用DD-PC1建立了相对论的准粒子随机相位近似（RQRPA），并补充了等异源性旋转器相互作用通道，以便研究不自然的均衡过渡。介绍的框架已使用M1总和核心 - 二核系统进行了验证，并用于用于旋转，轨道，等轴和ISOSCALAR和ISOVECTOR M1过渡强度，与电磁探针有关，与电磁探针有关，与魔术Nuclei $^{48} $ CA和$^ca和$^$^$^$^$ pB，以及nuct $^$ pb，以及nuct $ pb，以及$^$^nuci $^nuct，以及$^{50} $ ti。在这些系统中，ISOVECTOR SPIN-FLIP M1转变主要是在一个或两个自旋轨道伴侣状态之间。结果表明，配对相关性对M1模式的质心能量和主要峰位置具有重大影响。 M1激发可以提供额外的约束，以改善未来研究的核能密度功能。
Magnetic dipole (M1) excitations build not only a fundamental mode of nucleonic transitions, but they are also relevant for nuclear astrophysics applications. We have established a theory framework for description of M1 transitions based on the relativistic nuclear energy density functional. For this purpose the relativistic quasiparticle random phase approximation (RQRPA) is established using density dependent point coupling interaction DD-PC1, supplemented with the isovector-pseudovector interaction channel in order to study unnatural parity transitions. The introduced framework has been validated using the M1 sum rule for core-plus-two-nucleon systems, and employed in studies of the spin, orbital, isoscalar and isovector M1 transition strengths, that relate to the electromagnetic probe, in magic nuclei $^{48}$Ca and $^{208}$Pb, and open shell nuclei $^{42}$Ca and $^{50}$Ti. In these systems, the isovector spin-flip M1 transition is dominant, mainly between one or two spin-orbit partner states. It is shown that pairing correlations have a significant impact on the centroid energy and major peak position of the M1 mode. The M1 excitations could provide an additional constraint to improve nuclear energy density functionals in the future studies.
