标题： 从磁偶极激发辨别核成对特性 显示英文标题

标题： Discerning nuclear pairing properties from magnetic dipole excitation

摘要： 库珀对的配对关联是多费米子相互作用系统的基本属性。对于核子，可能存在两种库珀对耦合模式，即$S_{12}=0$与$L_{12}=0$（自旋单态s波）和$S_{12}=1$与$L_{12}=1$（自旋三重态p波）。在核物理中，自旋单态耦合与自旋三重态耦合哪个占主导地位一直是一个悬而未决的问题，同时如何测量它们的作用也是一个难题。我们研究了原子核的磁偶极（M1）激发与相对论性核能量密度泛函（RNEDF）框架下配对模式之间的关系。基态中的配对关联通过相对论性Hartree-Bogoliubov（RHB）模型来考虑，而相对论准粒子随机相位近似（RQRPA）被用来描述M1跃迁。我们已经表明，M1激发性质对计算中所涉及的配对模型具有敏感性。系统地评估M1跃迁以及精确的实验数据使我们能够辨别有限核中的配对特性。 显示英文摘要

摘要： Pairing correlation of Cooper pair is a fundamental property of multi-fermion interacting systems. For nucleons, two modes of the Cooper-pair coupling may exist, namely of $S_{12}=0$ with $L_{12}=0$ (spin-singlet s-wave) and $S_{12}=1$ with $L_{12}=1$ (spin-triplet p-wave). In nuclear physics, it has been an open question whether the spin-singlet or spin-triplet coupling is dominant, as well as how to measure their role. We investigate a relation between the magnetic-dipole (M1) excitation of nuclei and the pairing modes within the framework of relativistic nuclear energy-density functional (RNEDF). The pairing correlations are taken into account by the relativistic Hartree-Bogoliubov (RHB) model in the ground state, and the relativistic quasi-particle random-phase approximation (RQRPA) is employed to describe M1 transitions. We have shown that M1 excitation properties display a sensitivity on the pairing model involved in the calculations. The systematic evaluation of M1 transitions together with the accurate experimental data enables us to discern the pairing properties in finite nuclei.