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Aug 22 – 26, 2022
Rio de Janeiro
America/Sao_Paulo timezone

The HIBEAM/NNBAR Experiment at the ESS

Aug 23, 2022, 9:50 AM
Rio de Janeiro

Rio de Janeiro

Vice-Governador Rúbens Berardo street, 100 - Gávea Rio de Janeiro - 22451-070
Plenary/Parallel talk Plenary Talk


Bernhard Meirose (Stockholm University (SE))


The HIBEAM/NNBAR experiment is a two stage experiment for the European Spallation
Source (ESS) to search for baryon number violation. The experiment would make high sensitivity searches for baryon number violating processes: n → nbar and n → n′(neutron to sterile neutron), corresponding to the selection rules in baryon number ΔB = 2, 1 , respectively. The experiment addresses topical open questions such as baryogenesis and dark matter, and is sensitive to a scale of new physics substantially in excess of that available at colliders. This is a cross-disciplinary experiment with a clear particle physics goal. The community encompasses physicists from large collider experiments and low energy nuclear physics experiments, together with scientists specialising in neutronics and magnetics. European, US and Asian communities are represented. The experiment would increase the sensitivity to neutron conversion probabilities by three orders of magnitude compared with previous searches. The opportunity to make such a leap in sensitivity in tests of a global symmetry is a rare one.

Presentation materials