Article, 2024

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

Journal of Neutron Research, ISSN 1023-8166, Volume 25, 3-4, Pages 315-406, 10.3233/JNR-230951

Contributors

Santoro V. (Corresponding author) [1] [2] Abou El Kheir O. [3] Acharya D. [3] Akhyani M. [4] Andersen K.H. [5] Barrow J. [6] [7] Bentley P.M. [2] Bernasconi M. 0000-0001-6285-1538 [3] Bertelsen M. [2] Bessler Y. [8] Bianchi A. [2] Brooijmans G. 0000-0002-3354-1810 Broussard L. 0000-0001-9182-2808 [5] Brys T. [2] Busi M. 0000-0001-8195-7477 [9] Campi D. [3] Chambon A. [10] Chen J. [8] Czamler V. [11] Deen P.P. 0000-0002-0204-0802 [2] Dijulio D.D. [2] Dian E. [12] Draskovits L. [12] Dunne K. 0000-0003-2626-2247 [13] El Barbari M. [8] Ferreira M.J. [2] Fierlinger P. [14] Frost V.T. [15] Folsom B. 0000-0002-8809-0236 [2] [3] Friman-Gayer U. [2] Gaye A. [2] Gorini G. 0000-0002-4673-0901 [3] Gustafsson A. [15] Gutberlet T. [8] Happe C. [8] Han X. [16] [17] Hartl M. [2] Holl M. [2] Jackson A. [2] Kemp E. 0000-0001-5311-1300 [18] Kamyshkov Y. [19] Kittelmann T. 0000-0002-7396-4922 [2] Klinkby E.B. 0000-0002-1908-5644 [10] Kolevatov R. 0000-0001-5547-6995 Laporte S.I. [3] Lauritzen B. 0000-0001-7173-1650 [10] Lejon W. [13] Linander R. [2] Lindroos M. [2] Marko M. [12] Marquez Damian J.I. 0000-0002-9611-914X [2] McClanahan T.C. [5] Meirose B. 0000-0003-0032-7022 [1] [13] Mezei F. Michel K. [2] Milstead D.A. 0000-0002-7788-4129 [13] Muhrer G. [2] Nepomuceno A.A. [20] Neshvizhevsky V. [11] Nilsson T. 0000-0002-6990-947X [21] Oden U. [2] Plivelic T.S. [22] Ramic K. [2] Rataj B. [1] [2] Remec I. [5] Rizzi N. 0000-0003-1542-1695 [10] Rogers J. [19] Rosenthal E. [8] Rosta L. [12] Rucker U. [8] Samothrakitis S. 0000-0002-1382-3976 [9] Schreyer A. [23] Selknaes J.R. [2] Shuai H. Silverstein S.B. 0000-0001-7734-7617 [13] Snow W.M. [24] Strobl M. 0000-0001-9315-8787 [9] Strothmann M. 0000-0003-1870-6004 [8] Takibayev A. [2] Wagner R. 0000-0001-8793-0507 [11] Willendrup P.K. [2] [10] Xu S. [2] Yiu S.C. [13] Yngwe L. [15] Young A.R. [25] Wolke M. [26] Zakalek P. [8] Zavorka L. [5] Zanini L. 0000-0002-0489-0624 [2] Zimmer O. [11]

Affiliations

  1. [1] Lund University
    2. [NORA names: Sweden; Europe, EU; Nordic; OECD];
  2. [2] European Spallation Source ERIC
    3. [NORA names: Sweden; Europe, EU; Nordic; OECD];
  3. [3] University of Milano-Bicocca
    4. [NORA names: Italy; Europe, EU; OECD];
  4. [4] Ecole Polytechnique Fédérale de Lausanne
    5. [NORA names: Switzerland; Europe, Non-EU; OECD];
  5. [5] Oak Ridge National Laboratory
    6. [NORA names: United States; America, North; OECD];

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.

Data Provider: Elsevier

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