HighNESS conceptual design report: Volume II. the NNBAR experiment.

Summary, in English

A key aim of the HighNESS project for the European Spallation Source is to enable cutting-edge particle physics experiments. This volume presents a conceptual design report for the NNBAR experiment. NNBAR would exploit a new cold lower moderator to make the first search in over thirty years for free neutrons converting to anti-neutrons. The observation of such a baryon-number-violating signature would be of fundamental significance and tackle open questions in modern physics, including the origin of the matter-antimatter asymmetry. This report shows the design of the beamline, supermirror focusing system, magnetic and radiation shielding, and anti-neutron detector necessary for the experiment. A range of simulation programs are employed to quantify the performance of the experiment and show how background can be suppressed. For a search with full background suppression, a sensitivity improvement of three orders of magnitude is expected, as compared with the previous search. Civil engineering studies for the NNBAR beamline are also shown, as is a costing model for the experiment. © 2023 - The authors. Published by IOS Press.

• Author: V. Santoro; B. Meirose; T. Plivelic; B. Rataj; O. Zimmer
• Department/s: Particle and nuclear physics; MAX IV Laboratory
• Publishing year: 2023
• Language: English
• Pages: 315-406
• Publication/Series: Journal of Neutron Research
• Volume: 25
• Issue: 3-4
• Links: http://dx.doi.org/10.3233/JNR-230951
• Document type: Journal article
• Publisher: SAGE Publications
• Topic: Subatomic Physics
• Status: Published
• ISBN/ISSN/Other: ISSN: 1023-8166