Search for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>n</mml:mi><mml:mo>−</mml:mo><mml:mover accent="true"><mml:mi>n</mml:mi><mml:mo accent="true" stretchy="false">¯</mml:mo></mml:mover></mml:math>oscillation in Super-Kamiokande

Abe, K.; Hayato, Y.; Iida, Tsutomu; Ishihara, K.; Kameda, J.; Koshio, Y.; Minamino, A.; Mitsuda, C.; Miura, Makoto; Moriyama, S.; Nakahata, M.; Obayashi, Y.; Ogawa, Hiroshi; Sekiya, H.; Shiozawa, M.; Suzuki, Yoshihiro; Takeda, Atsushi; Takeuchi, Y.; Ueshima, K.; Watanabe, H.; Higuchi, I.; Ishihara, C.; Ishitsuka, M.; Kajita, T.; Kaneyuki, K.; Mitsuka, G.; Nakayama, S.; Nishino, Hitoshi; Okumura, K.; Saji, C.; Takenaga, Y.; Clark, S.; Desai, S.; Dufour, Frédéric; Herfurth, A.; Kearns, E.; Likhoded, S.; Litos, M.; Raaf, J. L.; Stone, J. L.; Sulak, L.; Wang, W.; Goldhaber, M.; Casper, D.; Cravens, J. P.; Dunmore, J.; Griskevich, J.; Kropp, W. R.; Liu, D. W.; Mine, S.; Regis, C.; Smy, M. B.; Sobel, H. W.; Vagins, M.; Ganezer, K. S.; Hartfiel, B. L.; Hill, J.; Keig, W. E.; Jang, J. S.; Jeoung, I. S.; Kim, J. Y.; Lim, I. T.; Scholberg, K.; Tanimoto, N.; Walter, C. W.; Wendell, R.; Ellsworth, R. W.; Tasaka, S.; Guillian, G.; Learned, J. G.; Matsuno, S.; Messier, M. D.; Ichikawa, A. K.; Ishida, Toru; Ishii, T.; Iwashita, T.; Kobayashi, T.; Nakadaira, T.; Nakamura, K.; Nishikawa, K.; Nitta, K.; Oyama, Y.; Suzuki, A.; Hasegawa, M.; Maesaka, H.; Nakaya, T.; Sasaki, T.; Sato, Hikaru; Tanaka, Hirohisa; Yamamoto, Shuji; Yokoyama, M.; Haines, T. J.; Dazeley, S.; Hatakeyama, S.; Svoboda, R.; Sullivan, G. W.; Gran, R.; Habig, A.; Fukuda, Y.; Itow, Y.; Koike, T.; Jung, C. K.; Kato, Takashi; Kobayashi, Kazuyoshi; McGrew, C.; Sarrat, A.; Terri, R.; Yanagisawa, C.; Tamura, N.; Ikeda, M.; Sakuda, M.; Kuno, Y.; Yoshida, Masato; Kim, S. B.; Yang, B. S.; Ishizuka, T.; Okazawa, H.; Choi, Y.; Seo, H.; Gando, Y.; Hasegawa, T.; Inoue, K.; Ishii, H.; Nishijima, K.; Ishino, H.; Watanabe, Y.; Koshiba, M.; Totsuka, Y.; Chen, S.; Deng, Z. Y.; Liu, Y.; Kiełczewska, D.; Berns, H.; Shiraishi, Kiyoshi; Thrane, E.; Washburn, K.; Wilkes, R. J.

doi:10.1103/physrevd.91.072006

Cited by 136 publications

(178 citation statements)

References 32 publications

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“…According to Super-Kamiokande's studies [10], the surrounding nuclear media absorb ∼23% of the outgoing pions after annp ornn interaction.…”

Section: O Ofmentioning

confidence: 99%

“…These intermediate states can then decay into channels including multiple pions; however, the decay of the intermediate states is not constrained to pion-only final states. (ii) Momentum regime II (∼250 MeV): Alternative interaction channels [10] fornp annihilation have also been modeled using beam data ofpn collisions at momenta comparable to the…”

Section: B N-n In the Deuteronmentioning

confidence: 99%

“…The current experimental limits are of the order τ free ∼ 10 8 s [7][8][9][10]. Calculations using seesaw models with parity symmetry predict an upper limit to the free oscillation time of τ free ¼ ℏ=δm n−n c 2 < 10 10 s [11], where δm n−n is a perturbation term equivalent to the mixing rate of neutrons to antineutrons.…”

Section: Introductionmentioning

confidence: 96%

“…corresponding to a free oscillation limit of 2.7 × 10 8 s at 90% C.L. [10]. The Super-Kamiokande analysis required careful modeling of the effect of pion absorption in 16 O in the multiprong signature of n-n events.…”

mentioning

confidence: 99%

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Search for neutron-antineutron oscillations at the Sudbury Neutrino Observatory

Aharmim¹,

Ahmed²,

Anthony³

et al. 2017

Phys. Rev. D

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Tests on B − L symmetry breaking models are important probes to search for new physics. One proposed model with ΔðB − LÞ ¼ 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 × 10 31 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 × 10 31 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.

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“…According to Super-Kamiokande's studies [10], the surrounding nuclear media absorb ∼23% of the outgoing pions after annp ornn interaction.…”

Section: O Ofmentioning

confidence: 99%

Section: B N-n In the Deuteronmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

mentioning

confidence: 99%

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Search for neutron-antineutron oscillations at the Sudbury Neutrino Observatory

Aharmim¹,

Ahmed²,

Anthony³

et al. 2017

Phys. Rev. D

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“…1). The best limits for nn oscillations stem from bound neutrons inside nuclei [25,26]. Present limits for nn and nn oscillations from free neutrons are from 1994 [27] respectively the late 2000s [28,29,30].…”

Section: Fundamental Neutron Physicsmentioning

confidence: 99%

Cold and Ultra-cold Neutrons as Probes of New Physics

Konrad¹,

Abele²

2017

Proceedings of the 26th International Nuclear Physics Conference — PoS(INPC2016)

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Despite the great success of the Standard Model, many key questions in particle physics, astrophysics, and cosmology are unanswered. In particular, more than 95 % of the universe consists of unknown dark matter and dark energy. Today, a major goal of particle physics is to look for evidence of new physics beyond the Standard Model. Collider searches for new physics are well suited to the direct production of new high-mass particles, whereas low-energy precision experiments search for traces that new particles leave in known processes. Direct and indirect evidence of new physics are highly complementary. High-precision experiments with extremely slow, cold and ultra-cold neutrons address some of the unanswered questions, for instance, on the nature of the fundamental forces and underlying symmetries, the origin, evolution, and fate of the universe, or on the nature of the gravitational force at very small distances. For example, the limit on the electric dipole moment of the neutron constrains the CP violating phases, the lifetime of the neutron determines the relative helium abundance in the universe, and neutrons bouncing over a mirror probe dark matter and dark energy. New facilities and technological developments now give window for significant improvement in precision by one to two orders of magnitude. In this paper, we will give an overview of current and planned facilities and experiments, as well as an overview of some of the applications of neutrons to astrophysics, cosmology, and physics beyond the Standard Model.

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Introduction

Menendez¹

2018

Neutrino Physics in Present and Future Kamioka Water‐Čerenkov Detectors With Neutron Tagging

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Search forn−n¯oscillation in Super-Kamiokande

Cited by 136 publications

References 32 publications

Search for neutron-antineutron oscillations at the Sudbury Neutrino Observatory

Search for neutron-antineutron oscillations at the Sudbury Neutrino Observatory

Cold and Ultra-cold Neutrons as Probes of New Physics

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