Status of the Design of an Annihilation Detector to Observe Neutron-Antineutron Conversions at the European Spallation Source. - Sze-Chun Yiu; Bernhard Meirose; Joshua Barrow; Christian Bohm; Gustaaf Brooijmans; Katherine Dunne; Elena S. Golubeva; David Milstead; André Nepomuceno; Anders Oskarsson; Valentina Santoro; Samuel Silverstein (Symmetry, 2022)