标题： 中子之间的偶极-偶极色散相互作用 显示英文标题

标题： Dipole-dipole dispersion interactions between neutrons

摘要： 我们利用近期关于中子静磁和动力学电偶极极化率以及磁偶极极化率的数据，研究了两个中子之间的长程相互作用。 所得的长程势被用于定量比较中子与中子碰撞和中子与质子碰撞的情况。 我们还评估了第一pion生产阈值和核子的第一激发态，即$\Delta$-共振（$J^{\pi}$ = + 3/2, I = 3/2）的重要性。 我们发现这两种动态效应对于中子-中子系统、中子-壁系统以及壁-中子-壁系统中的距离r从约50飞米到约$10^3$飞米之间相当重要，在此之外达到了预期的渐近极限。 讨论了我们的发现对瓶内超冷中子限制的相关性。 显示英文摘要

摘要： We investigate the long-range interactions between two neutrons utilizing recent data on the neutron static and dynamic electric and magnetic dipole polarizabilities. The resulting long-range potentials are used to make quantitative comparisons between the collisions of a neutron with a neutron and a neutron with a proton. We also assess the importance of the first pion production threshold and first excited state of the nucleon, the $\Delta$-resonance ($J^{\pi}$ = + 3/2, I = 3/2). We found both dynamical effects to be quite relevant for distances r between ~ 50 fm up to ~$10^3$ fm in the nn system, the neutron-wall system and in the wall-neutron-wall system, reaching the expected asymptotic limit beyond that. Relevance of our findings to the confinement of ultra cold neutrons inside bottles is discussed.