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.

Santoro, V., Abou El Kheir, O., Acharya, D., Akhyani, M., Andersen, K., Barrow, J., et al. (2024). HighNESS conceptual design report: Volume II. the NNBAR experiment. JOURNAL OF NEUTRON RESEARCH, 25(3-4), 315-406 [10.3233/JNR-230951].

HighNESS conceptual design report: Volume II. the NNBAR experiment

Abou El Kheir O.;Acharya D.;Bernasconi M.;Campi D.;Gorini G.;
2024

Abstract

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.
Articolo in rivista - Articolo scientifico
NNBAR experiment
English
3-mag-2024
2024
25
3-4
315
406
none
Santoro, V., Abou El Kheir, O., Acharya, D., Akhyani, M., Andersen, K., Barrow, J., et al. (2024). HighNESS conceptual design report: Volume II. the NNBAR experiment. JOURNAL OF NEUTRON RESEARCH, 25(3-4), 315-406 [10.3233/JNR-230951].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/480999
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