Effects of Plasma Phenomena on Neutrino Mass Measurements Process Using a Gaseous Tritium β-Source

Nastoyashchii, Anatoly F.; Titov, N.; Morozov, I.N.; Glück, F.; Otten, Ernst W.

doi:10.13182/fst05-a1028

Cited by 14 publications

(16 citation statements)

References 4 publications

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“…With the increase of the source column density from 1.11 × 10 17 cm −2 to 4.23 × 10 17 cm −2 in this campaign, the creation rates and densities of the charge carriers, as well as the fraction of scattered electrons, increased accordingly, which makes plasma effects more relevant 12,70,71 . A detailed description of the plasma calibration is given in Sec.…”

Section: Systematic Uncertaintiesmentioning

confidence: 82%

First direct neutrino-mass measurement with sub-eV sensitivity

Aker¹,

Böttcher²,

Beglarian³

et al. 2021

Preprint

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We report the results of the second measurement campaign of the Karlsruhe Tritium Neutrino (KATRIN) experiment. KATRIN probes the effective electron anti-neutrino mass, mν, via a high-precision measurement of the tritium β-decay spectrum close to its endpoint at 18.6 keV. In the second physics run presented here, the source activity was increased by a factor of 3.8 and the background was reduced by 25% with respect to the first campaign. A sensitivity on mν of 0.7 eV/c2 at 90% confidence level (CL) was reached. This is the first sub-eV sensitivity from a direct neutrino-mass experiment. The best fit to the spectral data yields mν2=(0.26±0.34) eV2/c4, resulting in an upper limit of mν<0.9 eV/c2 (90% CL). By combining this result with the first neutrino mass campaign, we find an upper limit of mν<0.8 eV/c2 (90% CL).

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Section: Systematic Uncertaintiesmentioning

confidence: 82%

First direct neutrino-mass measurement with sub-eV sensitivity

Aker¹,

Böttcher²,

Beglarian³

et al. 2021

Preprint

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“…This includes the 10 11 daughter ions per second, which emerge from β-decay in the source tube, as well as the 10 12 electron-ion pairs per second produced therein by the β-electron-flux through ionization of T 2 molecules. The strong magnetic field of 3.6 T within the source is confining this plasma strictly in the transverse direction so that charged particles cannot diffuse to the conducting wall of the source tube where they would get neutralized [126]. The charges within the windowless gaseous tritium source will thus be neutralized by a gold-plated crystalline rear wall which is part of the calibration and monitoring system, and on which all magnetic field lines from the windowless gaseous tritium source The beam tube guiding the β-decay electrons features a chicane to avoid the molecular beaming effect.…”

Section: Calibration and Monitoring System Upstream Of The Wgtsmentioning

confidence: 99%

Current Direct Neutrino Mass Experiments

Drexlin

Hannen

Mertens

et al. 2013

Advances in High Energy Physics

288

304

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In this contribution we review the status and perspectives of direct neutrino mass experiments. These experiments investigate the kinematics of β-decays of specific isotopes ( 3 H, 187 Re, 163 Ho) to derive model-independent information on the averaged electron (anti-) neutrino mass, which is formed by the incoherent sum of the neutrino mass eigenstates contributing to the electron neutrino. We first review the kinematics of β-decay and the determination of the neutrino mass, before giving a brief overview of past neutrino mass measurements (SN1987a-ToF studies, Mainz and Troitsk experiments for 3 H, cryo-bolometers for 187 Re). We then describe the Karlsruhe Tritium Neutrino (KATRIN) experiment which is currently under construction at Karlsruhe Institute of Technology. The large-scale setup will use the MAC-E-Filter principle pioneered earlier to push the sensitivity down to a value of 200 meV (90% C.L.). KATRIN faces many technological challenges that have to be resolved with regard to source intensity and stability, as well as precision energy analysis and low background rate close to the kinematic endpoint of tritium β-decay at 18.6 keV. We then review new experimental approaches such as the MARE, ECHO and Project8 experiments, which offer the promise to perform an independent measurement of the neutrino mass in the sub-eV region. This variety of methods and the novel technologies developed in all present and future experiments demonstrate the great potential of direct neutrino mass experiments in providing vital information on the absolute mass scale of neutrinos.

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“…The strong magnetic field of 3.5 Tesla within the source is confining this plasma strictly in the transverse direction such that charged particles cannot diffuse to the conducting wall of the source tube for getting neutralized. The question, how the plasma in the source becomes neutralized then or at which potential it might charge up eventually, has been raised and dealt with only recently [140].The salient point is, however, that the longitudinal mobility is not influenced by the magnetic field. Hence the resulting high longitudinal conductance of the plasma will stabilize the potential along a magnetic field line to that value which this field line meets at the point where it crosses a rear wall.…”

Section: Preview On Forthcoming Experimentsmentioning

confidence: 99%

Neutrino mass limit from tritium β decay

2008

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The paper reviews recent experiments on tritium β-spectroscopy searching for the absolute value of the electron neutrino mass m(ν e ). By use of dedicated electrostatic filters with high acceptance and resolution, the uncertainty on the observable m 2 (ν e ) has been pushed down to about 3 eV 2 . The new upper limit of the mass is m(ν e ) < 2 eV at 95% C.L. In view of erroneous and unphysical mass results obtained by some earlier experiments in β-decay, particular attention is paid to systematic effects. The mass limit is discussed in the context of current neutrino research in particle-and astrophysics. A preview is given of the next generation of β-spectroscopy experiments currently under development and construction; they aim at lowering the m 2 (ν e )-uncertainty by another factor of 100, reaching a sensitivity limit m(ν e ) < 0.2 eV.

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Effects of Plasma Phenomena on Neutrino Mass Measurements Process Using a Gaseous Tritium β-Source

Cited by 14 publications

References 4 publications

First direct neutrino-mass measurement with sub-eV sensitivity

First direct neutrino-mass measurement with sub-eV sensitivity

Current Direct Neutrino Mass Experiments

Neutrino mass limit from tritium β decay

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