Advancing the Optical Potential Developments to Guide the Future Experimental Research

近年来，人们对远离稳定性的核系统越来越感兴趣。发现新的和意想不到的现象的可能性导致了越来越多的实验努力致力于调查这样的系统。随着即将到来的奇异核设施，如FAIR在GSI，SPIRAL 2在GANIL，SPES在LNL，核子-核弹性散射是一种自然的方式来探索这些系统的属性。在这种情况下，光学势框架起着核心作用，使我们能够进行预测，以指导和分析未来的实验研究。即使现象学方法通常是首选，由于输入所需的自由参数，缺乏预测能力，使我们无法提供可靠的预测。因此，光学势的微观方法代表了进行这种预测和评估不可避免的近似影响的首选方法，为反应过程提供了清晰的物理解释。该项目的目标是从手征微扰理论中导出的核子间相互作用出发，开发微观光学势，手征微扰理论是低能量子染色体动力学的有效场论。这个框架提供了理想的起点，使我们能够始终如一地推导出由相同的原则和对称性连接的两个和三个核子的相互作用。这样的相互作用，然后被用作计算的光学势，这是完全免费的现象，并提供了更高的预测能力的唯一输入。

Recent years experienced an increasing interest for nuclear systems far from stability. The possibility of finding new and unexpected phenomena resulted in an increasing experimental effort devoted to investigating such systems. With the upcoming facilities for exotic nuclei, such as FAIR at GSI, SPIRAL2 at GANIL, and SPES at LNL, the nucleon-nucleus elastic scattering represents a natural way to explore the properties of these systems. In this context, the optical potential framework plays a central role and allows us to perform predictions to guide and analyse the future experimental research. Even if a phenomenological approach is usually preferred, the lack of predicting power due to the free parameters required in input, prevents us from providing reliable predictions. Thus, a microscopic approach to the optical potential represents the preferred way to make such predictions and assess the impact of unavoidable approximations, offering a clear physical interpretation of the reaction process. The goal of the project is to develop a microscopic optical potential starting from inter-nucleon interactions derived within the Chiral Perturbation Theory, which is the effective field theory of low-energy Quantum Chromo Dynamics. This framework offers the ideal starting point, allowing us to consistently derive two- and three-nucleon interactions that are connected by the same principles and symmetries. Such interactions are then used as the only input for the calculation of the optical potential, which is completely free from phenomenology and offers a higher predictive power.