For one-neutron halo nuclei, the cross sections for elastic scattering and breakup at intermediate energy exhibit similar angular dependences. The Recoil Excitation and Breakup (REB) model of reactions elegantly explains this feature. It also leads to the idea of a new reaction observable to study the structure of loosely-bound nuclear systems: the Ratio. This observable consists of the ratio of angular distributions for different reaction channels, viz. elastic scattering and breakup, which cancels most of the dependence on the reaction mechanism; in particular it is insensitive to the choice of optical potentials that simulate the projectile-target interaction. This new observable is very sensitive to the structure of the projectile. In this article, we review a series of previous papers, which have introduced the Ratio Method and its extension to low beam energies and proton-halo nuclei.

对于一个中子晕核，弹性散射和中能破裂的横截面表现出相似的角度依赖性。反应的反冲激发和分解（REB）模型很好地解释了此功能。这也引出了一种新反应的想法，即可观察到的研究松散结合的核系统的结构：比率。可观察到的是不同反应通道的角度分布比，即。弹性散射和破裂，消除了对反应机理的大部分依赖；特别是它对模拟弹丸-目标相互作用的光势的选择不敏感。这个新的观测值对射弹的结构非常敏感。在本文中，我们回顾了一系列先前的论文，