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

Santoro, V.; Abou El Kheir, O.; Acharya, D.; Akhyani, M.; Andersen, K. H.; Barrow, J.; Bentley, P.; Bernasconi, M.; Bertelsen, M.; Beßler, Y.; Bianchi, A.; Brooijmans, G.; Broussard, L.; Brys, T.; Busi, M.; Campi, D.; Chambon, A.; Chen, J.; Czamler, V.; Deen, P.; DiJulio, D. D.; Dian, E.; Draskovits, L.; Dunne, K.; El Barbari, M.; Ferreira, M. J.; Fierlinger, P.; Fröst, V. T.; Folsom, B. T.; Friman-Gayer, U.; Gaye, A.; Gorini, G.; Gustafsson, A.; Gutberlet, T.; Happe, C.; Han, X.; Hartl, M.; Holl, M.; Jackson, A.; Kemp, E.; Kamyshkov, Y.; Kittelmann, T.; Klinkby, E. B.; Kolevatov, R.; Laporte, S. I.; Lauritzen, B.; Lejon, W.; Linander, R.; Lindroos, M.; Marko, M.; Márquez Damián, J. I.; McClanahan, T. C.; Meirose, B.; Mezei, F.; Michel, K.; Milstead, D.; Muhrer, G.; Nepomuceno, A.; Neshvizhevsky, V.; Nilsson, T.; Odén, U.; Plivelic, T.; Ramic, K.; Rataj, B.; Remec, I.; Rizzi, N.; Rogers, J.; Rosenthal, E.; Rosta, L.; Rücker, U.; Samothrakitis, S.; Schreyer, A.; Selknaes, J. R.; Shuai, H.; Silverstein, S.; Snow, W. M.; Strobl, M.; Strothmann, M.; Takibayev, A.; Wagner, R.; Willendrup, P.; Xu, S.; Yiu, S. C.; Yngwe, L.; Young, A. R.; Wolke, M.; Zakalek, P.; Zavorka, L.; Zanini, L.; Zimmer, O.

doi:10.3233/jnr-230951

Title: HighNESS conceptual design report: Volume II. The NNBAR experiment.

Journal Article · 03 May 2024 · Journal of Neutron Research

DOI: https://doi.org/10.3233/jnr-230951 · OSTI ID:2438684

Santoro, V. ^[1]; Abou El Kheir, O. ^[2]; Acharya, D. ^[2]; Akhyani, M. ^[3]; Andersen, K. H. ^[4]; Barrow, J. ^[5]; Bentley, P. ^[6]; Bernasconi, M. ^[2]; Bertelsen, M. ^[6]; Beßler, Y. ^[7]; Bianchi, A. ^[6]; Brooijmans, G. ^[8]; Broussard, L. ^[4]; Brys, T. ^[6]; Busi, M. ^[9]; Campi, D. ^[2]; Chambon, A. ^[10]; Chen, J. ^[7]; Czamler, V. ^[11]; Deen, P. ^[6] more »

European Spallation Source ERIC, Lund, Sweden; Lund University, Lund, Sweden
University of Milano-Bicocca, Milano, Italy
École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
Oak Ridge National Laboratory, Oak Ridge, USA
Massachusetts Institute of Technology (MIT), Cambridge, USA; Tel Aviv University, Tel Aviv, Israel
European Spallation Source ERIC, Lund, Sweden
Forschungszentrum Jülich GmbH, Jülich, Germany
Department of Physics, Columbia University, New York, USA
Paul Scherrer Institut (PSI), Villigen, Switzerland
DTU Physics, Technical University of Denmark, Lyngby, Denmark
Institut Laue-Langevin ILL, Grenoble, France
Mirrotron Ltd., Budapest, Hungary; Centre for Energy Research, Budapest, Hungary
Centre for Energy Research, Budapest, Hungary
Stockholm University, Stockholm, Sweden
Technical University of Munich, Garching, Germany
Sweco AB, Malmö, Sweden
European Spallation Source ERIC, Lund, Sweden; University of Milano-Bicocca, Milano, Italy
Institute of High Energy Physics, Chinese Academy of Science, Beijing, 100049, China; University of Chinese Academy of Science, Beijing, 100049, China; Spallation neutron source science center, Dongguan, 523803, Guangdong, China
State University of Campinas, Campinas, Brazil
University of Tennessee, Knoxville, USA
ESS consultant, Oslo, Norway
Stockholm University, Stockholm, Sweden; Lund University, Lund, Sweden
Mirrotron Ltd., Budapest, Hungary
Departamento de Ciências da Natureza, Universidade Federal Fluminense, Niterói, Brazil
Institutionen för Fysik, Chalmers Tekniska Högskola, Sweden
MAX IV Synchrotron, Lund University, Lund, Sweden
Helmholtz-Zentrum hereon GmbH, Geesthacht, Germany
Department of Physics, Indiana University, Bloomington, USA
European Spallation Source ERIC, Lund, Sweden; DTU Physics, Technical University of Denmark, Lyngby, Denmark
Department of Physics, North Carolina State University, Raleigh, USA
Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Organization:: HIBEAM/NNBAR Collaboration

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2438684

Journal Information:: Journal of Neutron Research, Journal Name: Journal of Neutron Research Journal Issue: 3-4 Vol. 25; ISSN 1023-8166

Publisher:: IOS PressCopyright Statement

Country of Publication:: United States

Language:: English

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