This WP120 Workshop will be the fourth of the kind (after Paris in May 2016, Warwick in September 2017, and Milazzo in May 2018). The aim of the workshop is two-fold. First, to review the scientific issues and related tasks achieved since the previous workshop. The decisions on the chosen scientific options will then be discussed. Then, scientific presentations and discussions will take place about issues that still remained to be clarified and solved.

More information to follow.