Experimental estimation of the possible subbarrier penetration of ultracold neutrons through vacuum-tight foils

Лычагин, Е. В.; Muzychka, A. Yu.; Nesvizhevsky, V. V.; Nekhaev, G. V.; Strelkov, A. V.

doi:10.1134/1.1307989

Cited by 7 publications

(9 citation statements)

References 5 publications

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“…Considering the previous constraint p < 7 × 10 −6 [17] (vertical blue solid line), we see that the expected event rate could be as high as 36 kHz, which is easily detectable even without shielding. Actually, we think we can reach an upper rate of about 10 mHz or even 1 mHz [30][31][32] with suitable shields and detector (horizontal red solid line). We can then expect to reach a new upper constraint for the swapping probability p of about 10 −9 .…”

Section: Proposal At the Ill Reactormentioning

confidence: 98%

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Probing the braneworld hypothesis with a neutron-shining-through-a-wall experiment

et al. 2015

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The possibility for our visible world to be a 3-brane embedded in a multidimensional bulk is at the heart of many theoretical edifices in high-energy physics. Probing the braneworld hypothesis is thus a major experimental challenge. Following recent theoretical works showing that matter swapping between braneworlds can occur, we propose a neutron-shining-through-a-wall experiment. We first show that an intense neutron source such as a nuclear reactor core can induce a hidden neutron flux in an adjacent hidden braneworld. We then describe how a low-background detector can detect neutrons arising from the hidden world and quantify the expected sensitivity to the swapping probability. As a proof of concept, a constraint is derived from previous experiments.

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Section: Proposal At the Ill Reactormentioning

confidence: 98%

“…A constraint can be suggested from previous experiments [30][31][32]. Indeed, in different contexts, these experiments required low-noise neutron detectors to detect ultracold neutrons generated by conventional sources.…”

Section: E a Constraint As A Proof Of Conceptmentioning

confidence: 99%

Probing the braneworld hypothesis with a neutron-shining-through-a-wall experiment

et al. 2015

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“…However, the large unexpected loss rate is observed at a loss level of about 10 −5 per reflection and temperature independent [14]. The loss mechanism is still unknown, but inelastic up-scattering or quasi-elastic heating, and other proposed mechanisms seem to be ruled out by both theoretical calculations and experimental measurements as these rates are several orders of magnitude lower than the anomalous yet persistent loss rate [15][16][17].…”

Section: B More Puzzles In Neutron Lifetime and Ckm Unitaritymentioning

confidence: 92%

“…where the Fermi constant G F = 1.1663788(6) × 10 −5 GeV −2 [10], m e = 0.51099895000 (15) MeV is the electron mass [10], the neutron-specific radiative correction δ R = 0.014902(2)…”

Section: E Neutron Lifetime and Ckm Unitaritymentioning

confidence: 99%

Neutron lifetime anomaly and mirror matter theory

Tan¹

2023

Preprint

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This paper reviews the puzzles in modern neutron lifetime measurements and related unitarity issues in the CKM matrix. It is not a comprehensive and unbiased compilation of all historic data and studies, but rather a focus on compelling evidence leading to new physics. In particular, the largely overlooked nuances of different techniques applied in material and magnetic trap experiments are clarified. Further detailed analysis shows that the "beam" approach of neutron lifetime measurements is likely to give the "true" β-decay lifetime, while discrepancies in "bottle" measurements indicate new physics at play. The most feasible solution to these puzzles is a newly proposed ordinary-mirror neutron (n − n ) oscillation model under the framework of mirror matter theory. This phenomenological model is reviewed and introduced, and its explanations of the neutron lifetime anomaly and possible non-unitarity of the CKM matrix are presented. Most importantly, various new experimental proposals, especially lifetime measurements with small/narrow magnetic traps or under superstrong magnetic fields, are discussed in order to test the surprisingly large anomalous signals that are uniquely predicted by this new n − n oscillation model.

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“…where the Fermi constant G F = 1.1663788(6) × 10 −5 GeV −2 [10], m e = 0.51099895000 (15) MeV is the electron mass [10], the neutron-specific radiative correction δ ′ R = 0.014902(2) [82], the phase space factor f n is 1.6887(1) [82,83], and natural units (ℏ = c = 1) are used for simplicity. The 1% difference in neutron β-decay lifetime τ n between measurements from "beam" and "bottle" experiments leads to the discrepant V ud values according to Eq.…”

Section: E Neutron Lifetime and Ckm Unitaritymentioning

confidence: 99%

Neutron lifetime anomaly and mirror matter theory

Tan¹

2023

Preprint

View full text Add to dashboard Cite

This paper reviews the puzzles in modern neutron lifetime measurements and related unitarity issues in the CKM matrix. It is not a comprehensive and unbiased compilation of all historic data and studies, but rather a focus on compelling evidence leading to new physics. In particular, the largely overlooked nuances of different techniques applied in material and magnetic trap experiments are clarified. Further detailed analysis shows that the ``beam'' approach of neutron lifetime measurements is likely to give the ``true'' $\beta$-decay lifetime, while discrepancies in ``bottle'' measurements indicate new physics at play. The most feasible solution to these puzzles is a newly proposed ordinary-mirror neutron ($n-n'$) oscillation model under the framework of mirror matter theory. This phenomenological model is reviewed and introduced, and its explanations of the neutron lifetime anomaly and possible non-unitarity of the CKM matrix are presented. Most importantly, various new experimental proposals, especially lifetime measurements with small\slash narrow magnetic traps or under super-strong magnetic fields, are discussed in order to test the surprisingly large anomalous signals that are uniquely predicted by this new $n-n'$ oscillation model.

show abstract

Experimental estimation of the possible subbarrier penetration of ultracold neutrons through vacuum-tight foils

Cited by 7 publications

References 5 publications

Probing the braneworld hypothesis with a neutron-shining-through-a-wall experiment

Probing the braneworld hypothesis with a neutron-shining-through-a-wall experiment

Neutron lifetime anomaly and mirror matter theory

Neutron lifetime anomaly and mirror matter theory

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