The Development of the NNBAR Experiment

physics.ins-det

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Sep 19, 2022

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F. Backman, J. Barrow, Y. Beßler, A. Bianchi, C. Bohm, G. Brooijmans, L. J. Broussard, H. Calen, J. Cederkäll, J. I. M. Damian

and 33 more authors

E. Dian, D. D. Di Julio, K. Dunne, L. Eklund, M. J. Ferreira, P. Fierlinger, U. Friman-Gayer, C. Happe, M. Holl, T. Johansson, Y. Kamyshkov, E. Klinkby

/ 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.