Tests on B-L symmetry breaking models are important probes to search for new physics. One proposed model with Δ(B-L)=2 involves the oscillations of a neutron to an antineutron. In this paper, a new limit on this process is derived for the data acquired from all three operational phases of the Sudbury Neutrino Observatory experiment. The search concentrated on oscillations occurring within the deuteron, and 23 events were observed against a background expectation of 30.5 events. These translated to a lower limit on the nuclear lifetime of 1.48×1031 yr at 90% C.L. when no restriction was placed on the signal likelihood space (unbounded). Alternatively, a lower limit on the nuclear lifetime was found to be 1.18×1031 yr at 90% C.L. when the signal was forced into a positive likelihood space (bounded). Values for the free oscillation time derived from various models are also provided in this article. This is the first search for neutron-Antineutron oscillation with the deuteron as a target.
|Physical Review D
|Published - Nov 20 2017
Bibliographical noteFunding Information:
This research was supported by Canada’s Natural Sciences and Engineering Research Council; Industry Canada; National Research Council; Northern Ontario Heritage Fund; Atomic Energy of Canada, Ltd.; Ontario Power Generation; High Performance Computing Virtual Laboratory; Canada Foundation for Innovation; Canada Research Chairs program. USA’s Department of Energy, National Energy Research Scientific Computing Center, and Alfred P. Sloan Foundation. United Kingdom Science and Technology Facilities Council (formerly Particle Physics and Astronomy Research Council); and Portugal’s Fundação para a Ciência e a Tecnologia. We thank the SNO technical staff for their strong contributions. We thank Inco (now Vale, Ltd.) for hosting this project in their Creighton mine. This material is based upon work supported by the U.S. Department of Energy Office of Science, Office of Nuclear Physics under Award No. DE-FG02-88ER40479 and additional awards to individual institutions. Part of this work was prepared by LLNL under Contract No. DEAC52-07NA27344, release No. LLNL-JRNL-728820.
© 2017 American Physical Society.
ASJC Scopus subject areas
- Nuclear and High Energy Physics