Theoretical analysis of antineutron-nucleus data needed for antineutron mirrors in neutron-antineutron oscillation experiments

Протасов, К. В.; Gudkov, Vladimir; Kupriyanova, E. A.; Nesvizhevsky, V. V.; Snow, W. M.; Voronin, A. Yu.

doi:10.1103/physrevd.102.075025

Cited by 13 publications

(9 citation statements)

References 96 publications

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“…5(c) we show the curves for various partial-wave non-interference cross-sections σ BI el (L) from Eq. (18). They all obey Bethe-Landau's power law in proper order as L increases and unlike the diffraction pattern depicted earlier in the case of annihilation.…”

Section: Semiclassical Analyses Of the Annihilation Oscillations And ...mentioning

confidence: 53%

“…The corresponding information on antineutron-nucleus (nA) reaction [15], on the other hand, remains comparatively sparse and limited with the most recent work from the OBELIX's collaboration [16,17]. Nevertheless, the nA annihilation is essential in the process of quantifying signals from n → n oscillations in matter [18][19][20][21], and the significant the connection between the nA interaction-potential and the n → n oscillations rates have also been examined theoretically [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Pocket resonances in low-energy antineutrons reactions with nuclei

Lee,

Bayrak,

Wong

2021

Preprint

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Upon investigating whether the variation of the antineutron-nucleus annihilation cross-sections at very low energies satisfy Bethe-Landau's power law of σann(p) ∝ 1/p α behavior as a function of the antineutron momentum p, we uncover unexpected regular oscillatory structures in the low antineutron energy region from 0.001 to 10 MeV, with small amplitudes and narrow periodicity in the logarithm of the antineutron energies, for large-A nuclei such as Pb and Ag. Subsequent semiclassical analyses of the S matrices reveal that these oscillations are pocket resonances that arise from quasi-bound states inside the pocket and the interference between the waves reflecting inside the optical potential pockets with those from beyond the potential barriers, implicit in the nuclear Ramsauer effect. They are the continuation of bound states in the continuum. Experimental observations of these pocket resonances will provide vital information on the properties of the optical model potentials and the nature of the antineutron annihilation process.d This manuscript has been authored in part by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan),

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Section: Semiclassical Analyses Of the Annihilation Oscillations And ...mentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Pocket resonances in low-energy antineutrons reactions with nuclei

Lee,

Bayrak,

Wong

2021

Preprint

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“…An interesting option to simultaneously increase the sensitivity of such an experiment and decrease its cost is to implement the idea of a guide both for n and n [21,23,24,28]. While n guides have been in common use since the beginning of the neutron research, the idea of n guides seems counterintuitive; shouldn't we expect an n to annihilate immediately upon contact with matter?…”

Section: N and N Guides For N − N Oscillation Experimentsmentioning

confidence: 99%

Why very cold neutrons could be useful for neutron-antineutron oscillation searches

Nesvizhevsky

2023

JNR

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This note is based on a talk given at the “Workshop on Very Cold and Ultra Cold Neutron Sources for ESS”. It presents several arguments in favor of using very cold neutrons (VCN) for neutron – antineutron ( n − n ‾) searches. It also proposes a scheme for the implementation of a solid-deuterium VCN converter with a fluorinated detonation nanodiamond (F-DND) reflector that is optimized for an ( n − n ‾) experiment with VCN. An analysis of the feasibility of such a source, as well as its effect on the ( n − n ‾) experiment are beyond the scope of this short note. They will, however, be pursued in the near future in a collaborative manner.

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“…𝑛 ̅ [7][8][9][10]. Also, the total experimental length can become larger thus increasing quadratically the experiment sensitivity, without extending the transverse dimensions of experiment.…”

Section: Pos(panic2021)428mentioning

confidence: 99%

Implementations of neutron/antineutron (𝒏/𝒏̅) guides in experiments searching for 𝑛−𝑛̅ oscillations

Nesvizhevsky¹,

Гудков²,

Kupryanova³

et al. 2022

Proceedings of Particles and Nuclei International Conference 2021 — PoS(PANIC2021)

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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 post-sphaleron 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 ̅ ~10 10 𝑠 in the oscillation time, an improvement of ~10 4 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. 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. We point out a possible step-by-step implementation of the new method.

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Theoretical analysis of antineutron-nucleus data needed for antineutron mirrors in neutron-antineutron oscillation experiments

Cited by 13 publications

References 96 publications

Pocket resonances in low-energy antineutrons reactions with nuclei

Pocket resonances in low-energy antineutrons reactions with nuclei

Why very cold neutrons could be useful for neutron-antineutron oscillation searches

Implementations of neutron/antineutron (𝒏/𝒏̅) guides in experiments searching for 𝑛−𝑛̅ oscillations

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