Experimental Approach to Search for Free Neutron-Antineutron Oscillations Based on Coherent Neutron and Antineutron Mirror Reflection

Nesvizhevsky, V. V.; Gudkov, V.; Protasov, K. V.; Snow, W. M.; Voronin, A. Yu.

doi:10.1103/physrevlett.122.221802

Title: Experimental Approach to Search for Free Neutron-Antineutron Oscillations Based on Coherent Neutron and Antineutron Mirror Reflection

Journal Article · 07 June 2019 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.122.221802 · OSTI ID:1525340

Nesvizhevsky, V. V. ^[1]; Gudkov, V. ^[2]; Protasov, K. V. ^[3]; Snow, W. M. ^[4]; Voronin, A. Yu. ^[5]

Inst. Max von Laue—Paul Langevin, Grenoble (France)
Univ. of South Carolina, Columbia, SC (United States)
Lab. de Physique Subatomique et de Cosmologie, Grenoble (France)
Indiana Univ., Bloomington, IN (United States)
P.N. Lebedev Physical Inst., Moscow (Russia)

An observation of neutron-antineutron oscillations (n – n¯), which violate both B and B – L conservation, would constitute a scientific discovery of fundamental importance to physics and cosmology. A stringent upper bound on its transition rate would make an important contribution to our understanding of the baryon asymmetry of the Universe by eliminating the postsphaleron baryogenesis scenario in the light quark sector. We show that one can design an experiment using slow neutrons that in principle can reach the required sensitivity of τ_n–n¯ ~ 10¹⁰ s in the oscillation time, an improvement of ~ 10⁴ in the oscillation probability relative to the existing limit for free neutrons. The improved statistical accuracy needed to reach this sensitivity can be achieved by allowing both the neutron and antineutron components of the developing superposition state to coherently reflect from mirrors. We present a quantitative analysis of this scenario and show that, for sufficiently small transverse momenta of n/n¯ and for certain choices of nuclei for the n/n¯ guide material, the relative phase shift of the n and n¯ components upon reflection and the n¯ annihilation rate can be small enough to maintain sufficient coherence to benefit from the greater phase space acceptance the mirror provides.

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Research Organization:: Univ. of South Carolina, Columbia, SC (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0015882

OSTI ID:: 1525340

Alternate ID(s):: OSTI ID: 1612340

Journal Information:: Physical Review Letters, Vol. 122, Issue 22; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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CPT, CP, and C transformations of fermions, and their consequences, in theories with B-L violation Gardner, Susan; Yan, Xinshuai arXiv https://doi.org/10.48550/arxiv.1602.00693	text	January 2016
Limiting Equivalence Principle Violation and Long-Range Baryonic Force from Neutron-Antineutron Oscillation Babu, K. S.; Mohapatra, Rabindra N. arXiv https://doi.org/10.48550/arxiv.1606.08374	text	January 2016
Gauged B-L Number and Neutron--Antineutron Oscillation: Long-range Forces Mediated by Baryophotons Addazi, Andrea; Berezhiani, Zurab; Kamyshkov, Yuri arXiv https://doi.org/10.48550/arxiv.1607.00348	text	January 2016
Parity-doublet representation of Majorana fermions and neutron oscillation Fujikawa, Kazuo; Tureanu, Anca arXiv https://doi.org/10.48550/arxiv.1609.03203	text	January 2016
Phenomenology of neutron-antineutron conversion Gardner, Susan; Yan, Xinshuai arXiv https://doi.org/10.48550/arxiv.1710.09292	text	January 2017
Implications of an Improved Neutron-Antineutron Oscillation Search for Baryogenesis: A Minimal Effective Theory Analysis Grojean, Christophe; Shakya, Bibhushan; Wells, James D. arXiv https://doi.org/10.48550/arxiv.1806.00011	text	January 2018
Processes that break baryon number by two units and the Majorana nature of the neutrino Gardner, Susan; Yan, Xinshuai arXiv https://doi.org/10.48550/arxiv.1808.05288	text	January 2018
Neutron--Antineutron Oscillations: Discrete Symmetries and Quark Operators Berezhiani, Zurab; Vainshtein, Arkady arXiv https://doi.org/10.48550/arxiv.1809.00997	text	January 2018
Search for Neutron-Antineutron Oscillations Using Multiprong Events in Soudan 2 Chung, J. arXiv https://doi.org/10.48550/arxiv.hep-ex/0205093	text	January 2002
Neutron-antineutron Oscillations in the Trapping Box Kerbikov, B. O. arXiv https://doi.org/10.48550/arxiv.hep-ph/0212293	text	January 2002
Neutron - Antineutron Oscillations in a Trap Revisited Kerbikov, B. O.; Kudryavtsev, A. E.; Lensky, V. A. arXiv https://doi.org/10.48550/arxiv.hep-ph/0306039	text	January 2003
Neutron - Mirror Neutron Oscillations: How Fast Might They Be? Berezhiani, Zurab; Bento, Luis arXiv https://doi.org/10.48550/arxiv.hep-ph/0507031	text	January 2005
Antiproton-deuteron annihilation at low energies Karmanov, V. A.; Protasov, K. V.; Voronin, A. Yu. arXiv https://doi.org/10.48550/arxiv.nucl-th/0006041	text	January 2000
Unified optical-model approach to low-energy antiproton annihilation on nuclei and to antiprotonic atoms Batty, C. J.; Friedman, E.; Gal, A. arXiv https://doi.org/10.48550/arxiv.nucl-th/0010006	text	January 2000
Quantum motion of a neutron in a wave-guide in the gravitational field Voronin, A. Yu.; Abele, H.; Baessler, S. arXiv https://doi.org/10.48550/arxiv.quant-ph/0512129	text	January 2005
Urban modeling in computer-graphic and geographic information system environments Batty, M. Environment and Planning B: Planning and Design, Vol. 19, Issue 6 https://doi.org/10.1068/b190663	journal	January 1992

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Comment on B.O. Kerbikov, “The effect of collisions with the wall on neutron-antineutron transitions”, Phys. Lett. B 795 (2019) 362 Nesvizhevsky, V. V.; Gudkov, V.; Protasov, K. V. Physics Letters B, Vol. 803 https://doi.org/10.1016/j.physletb.2020.135357	journal	April 2020
Neutron Oscillations and the Parity Doubling Theorem Fujikawa, Kazuo; Tureanu, Anca Symmetry, Vol. 13, Issue 11 https://doi.org/10.3390/sym13112202	journal	November 2021
A new approach to search for free neutron-antineutron oscillations using coherent neutron propagation in gas Gudkov, V.; Nesvizhevsky, V. V.; Protasov, K. V. arXiv https://doi.org/10.48550/arxiv.1912.06730	text	January 2019
Theoretical Analysis of Antineutron-Nucleus Data needed for Antineutron Mirrors in Neutron-Antineutron Oscillation Experiments Protasov, K. V.; Gudkov, V.; Kupriyanova, E. A. arXiv https://doi.org/10.48550/arxiv.2009.11467	text	January 2020

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