Neutrino Mass from the Beta Spectrum in the Decay of Tritium

Boris, S.; Golutvin, A.; Laptin, L.; Lubimov, V.; Nagovizin, V.; Nozik, V.Z.; Novikov, E.; Soloshenko, V.; Tihomirov, I.; Tretjakov, E.; Myasoedov, N. F.

doi:10.1103/physrevlett.61.245

Cited by 2 publications

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“…An observable β-spectrum already emerged clearly from the background at 20 eV below the endpoint but the deduced shifted to increasingly more negative values with widening fit interval. Analyses of the last 137 eV of the tritium β-spectrum yielded an upper limit of The experimental results disproving the ITEP claim [117] are summarized in Tab. (2).…”

Section: Claim For the 30 Ev-neutrino And Its Disprovalmentioning

confidence: 93%

“…The magnetic field was adjusted to focus electrons of energy of 21.2 keV, exceeding the tritium endpoint energy. Nevertheless, the final result, published in 1987, remained substantially unchanged: V [117]. In the same work, "the model independent mass interval", 17 < eV was derived from the mass difference of the doublet 3 H -3 He.…”

Section: Claim For the 30 Ev-neutrino And Its Disprovalmentioning

confidence: 99%

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Constraints on the Active and Sterile Neutrino Masses from Beta-Ray Spectra: Past, Present and Future1

Dragoun¹,

Vénos²

2016

PHY

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Abstract:Although neutrinos are probably the most abundant fermions of the universe their mass is not yet known. Oscillation experiments have proven that at least one of the neutrino mass states has m i > 0.05 eV while various interpretations of cosmological observations yielded an upper limit for the sum of neutrino masses ∑m i < (0.14 -1.7) eV. The searches for the yet unobserved 0νββ decay result in an effective neutrino mass m ββ < (0.2 -0.7) eV. The analyses of measured tritium β-spectra provide an upper limit for the effective electron neutrino mass m(v e ) < 2 eV. In this review, we summarize the experience of two generations of β-ray spectroscopists who improved the upper limit of m(v e ) by three orders of magnitude. We describe important steps in the development of radioactive sources and electron spectrometers, and recapitulate the lessons from now-disproved claims for the neutrino mass of 30 eV and the 17 keV neutrino with an admixture larger than 0.03%. We also pay attention to new experimental approaches and searches for hypothetical sterile neutrinos.

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Section: Claim For the 30 Ev-neutrino And Its Disprovalmentioning

confidence: 93%

Section: Claim For the 30 Ev-neutrino And Its Disprovalmentioning

confidence: 99%

Constraints on the Active and Sterile Neutrino Masses from Beta-Ray Spectra: Past, Present and Future1

Dragoun¹,

Vénos²

2016

PHY

View full text Add to dashboard Cite

show abstract

“…(9) can still be applied, for each n, withfLvJ(R) replaced by the radial function of the continuous spectmmfL(R;E), and Eq. (9) now denotes the probability per unit of energy P,(E). The wavefunctions have been normalized to the Dirac delta function [ 191.…”

Section: Vibrational and Rotational Averaging Of The Transition Probamentioning

confidence: 99%