co-author countries:Brazil 🇧🇷Germany 🇩🇪Denmark 🇩🇰France 🇫🇷Hungary 🇭🇺Israel 🇮🇱Sweden 🇸🇪United States of America 🇺🇸
author keywords: Instrumentation for neutron sources; Detector modelling and simulations I (interaction of radiation with matter; interaction of photons with matter; interaction of hadrons with matter etc); Large detector systems for particle and astroparticle physics; Simulation methods and programs
Abstract The NNBAR experiment for the European Spallation Source will search for free neutrons converting to antineutrons with a sensitivity improvement of three orders of magnitude compared to the last such search. This paper describes progress towards a conceptual design report for NNBAR. The design of a moderator, neutron reflector, beamline, shielding and annihilation detector is reported. The simulations used form part of a model which will be used for optimisation of the experiment design and quantification of its sensitivity.