A Comment on "The possible explanation of neutron lifetime beam anomaly" by A. P. Serebrov, et al

Wietfeldt, F. E.; Biswas, Ripan; Haun, Robert; Dewey, M. S.; Caylor, Jimmy; Fomin, N.; Greene, Geoffrey L.; Haddock, C.; Hoogerheide, Shannon Fogwell; Mumm, H. P.; Nico, J. S.; Crawford, B. E.; Snow, W. M.

doi:10.48550/arxiv.2004.01165

Cited by 3 publications

(3 citation statements)

References 11 publications

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“…However, the current data set [8][9][10][11][12][13][14][15][16][17][18][19][20] shows a large discrepancy in lifetimes obtained by measuring the rate of neutron decay resulting in protons in the final state [14] and neutron lifetimes measured by counting surviving neutrons stored in a trap experiments. [21] A disputed [22] independent analysis of systematic uncertainties in the beam experiment [23] suggests that charge exchange on residual gas was not sufficiently analyzed in the beam experiment and that this effect might explain the discrepancy, but this needs to be tested. Measurements using different techniques that might identify systematic uncertainties that have not been identified are necessary to confirm or eliminate this discrepancy.…”

Section: Introductionmentioning

confidence: 99%

Fill and dump measurement of the neutron lifetime using an asymmetric magneto-gravitational trap

Cude-Woods¹,

González²,

Fries³

et al. 2022

Phys. Rev. C

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The past two decades have yielded several new measurements and reanalysis of older measurements of the neutron lifetime. These have led to a 4.4 standard deviation discrepancy between the most precise measurements of the neutron decay rate producing protons in cold neutron beams and the most precise lifetime measured in neutron storage experiments. Measurements using different techniques are important for investigating whether there are unidentified systematic effects in any of the measurements. In this paper we report a new measurement using the Los Alamos asymmetric magnetogravitational trap where the surviving neutrons are counted external to the trap using the fill and dump method. The new measurement gives a free neutron lifetime of stat syst 876.3(2.4) (0.8) n  . Although this measurement is not as precise, it is in statistical agreement with previous results using in situ counting in the same apparatus.

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Section: Introductionmentioning

confidence: 99%

Fill and dump measurement of the neutron lifetime using an asymmetric magneto-gravitational trap

Cude-Woods¹,

González²,

Fries³

et al. 2022

Phys. Rev. C

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“…In addition, theorists have developed many theoretical investigations to explain this discrepancy. One of the efforts is that in the beam current experiment, when protons are stored in the magnetic trap, the protons are lost due to the charge exchange collision between the protons and the remaining gas [39,40]. Another interesting idea is to take into account the inverse quantum Zeno effect (IZE), i.e., the observation of a quantum system, under certain conditions, will speed up its decay.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Neutron Lifetime and Purcell Effect

He,

Zhu

2021

Preprint

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Purcell effect predicts that spontaneous radiation is not an intrinsic property of matter, but is affected by the environment in which it is located, and is the result of the interaction of matter and field. Purcell effect can be inferred from Fermi's Gold rule through strict quantum electrodynamics (QED), and through it can achieve the enhancement or suppression of radiation. We suggest that, in principle, the Purcell effect can be detected at the percentage level of neutron decay in experiments with trapped ultra-cold neutrons. As a test of our claim, we propose a currently achievable experimental protocol that can detect whether Purcell effect has occurred in an trapped ultra-cold neutron lifetime measurement experiment. Finally, we discuss the discrepancy in current methods of measuring neutron lifetime, which may be caused by different experimental setups.

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“…Numerous studies have explored different possibilities [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43]. The most minimalistic scenario discussed in the literature is n → χγ, where χ is a fermionic DM that has a baryonic charge.…”

Section: Introductionmentioning

confidence: 99%

Neutron Decay to a Non-Abelian Dark Sector

Elahi,

Najafabadi

2020

Preprint

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According to the Standard Model (SM), we expect to find a proton for each decaying neutron. However, the experiments counting the number of decayed neutrons and produced protons have a disagreement. This discrepancy suggests that neutrons might have an exotic decay to a Dark Sector (DS). In this paper, we explore a scenario where neutrons decay to a dark Dirac fermion χ and a non-abelian dark gauge boson W . We discuss the cosmological implications of this scenario assuming DS particles are produced via freeze-in. In our proposed scenario, DS has three portals with the SM sector: (1) the fermion portal coming from the mixing of the neutron with χ, (2) a scalar portal, and (3) a non-renormalizable kinetic mixing between photon and dark gauge bosons which induces a vector portal between the two sectors. We show that neither the fermion portal nor the scalar portal should contribute to the production of the particles in the early universe. Specifically, we argue that the maximum temperature of the universe must be low enough to prevent the production of χ in the early universe. In this paper, we rely on the vector portal to connect the two sectors, and we discuss the phenomenological bounds on the model. The main constraints come from ensuring the right relic abundance of dark matter and evading the neutron star bounds. When dark gauge boson is very light, measurements of the Big Bang Nucleosynthesis impose a stringent constraint as well.

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A Comment on "The possible explanation of neutron lifetime beam anomaly" by A. P. Serebrov, et al

Cited by 3 publications

References 11 publications

Fill and dump measurement of the neutron lifetime using an asymmetric magneto-gravitational trap

Fill and dump measurement of the neutron lifetime using an asymmetric magneto-gravitational trap

Measurement of Neutron Lifetime and Purcell Effect

Neutron Decay to a Non-Abelian Dark Sector

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