Assessment of molecular effects on neutrino mass measurements from tritium<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math>decay

Bodine, Laura; Parno, D. S.; Robertson, R. Â. G. Â. H.

doi:10.1103/physrevc.91.035505

Cited by 62 publications

(117 citation statements)

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“…After the β-decay of tritium in a DT molecule, the daughter molecule 3 HeD + can end up in an electronic ground state or excited state, each of which is broadened by rotational and vibrational excitations of the molecule [28]. As a consequence, this excitation energy reduces the available kinetic energy for the electron, and thus, the differential β-electron spectrum is a superposition of spectra, corresponding to all possible final states.…”

Section: Calculation Of the Integral Beta-decay Spectrummentioning

confidence: 99%

“…Therefore, it was decided to adopt the final-state distribution of the HT isotopologue calculated by Saenz et al [38]. The isotope effects, i. e. the influence of the broadening of the initial vibrational ground-state wavefunction and the recoil on the mean excitation energy and variance of the final-state distribution is discussed in [28,38,53]. With the conservative assumption of 1% uncertainty on the relative normalization between ground and excited states, 1% uncertainty on the variance of the ground-state distribution, and 3% uncertainty on the excited-state distribution the adopted final-state distribution for HT (instead of DT) is still found to be sufficiently accurate for the present purpose.…”

Section: Final-state Distributionmentioning

confidence: 99%

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First operation of the KATRIN experiment with tritium

et al. 2020

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The determination of the neutrino mass is one of the major challenges in astroparticle physics today. Direct neutrino mass experiments, based solely on the kinematics of β-decay, provide a largely model-independent probe to the neutrino mass scale. The Karlsruhe Tritium Neutrino (KATRIN) experiment is designed to directly measure the effective electron antineutrino mass with a sensitivity of 0.2 eV (90% CL). In this work we report on the first operation of KATRIN with tritium which took place in 2018. During this commissioning phase of the tritium circulation system, excellent agreement of the theoretical prediction with the recorded spectra was found and stable conditions over a time period of 13 days could be established. These results are an essential prerequisite for the subsequent neutrino mass measurements with KATRIN in 2019.

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Section: Calculation Of the Integral Beta-decay Spectrummentioning

confidence: 99%

Section: Final-state Distributionmentioning

confidence: 99%

First operation of the KATRIN experiment with tritium

et al. 2020

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“…As future experiments aim for a bound of ∼ 30 meV [60], there is realistic hope to set stronger constraints on E 0 in the future. Since the endpoint is washed out by rotational-vibrational excitations of the daughter molecules, this means, regarding any future study of the systematics, that all molecular effects will need to be known sufficiently precise as well [62]. Also plasma-effects in the WGTS [63] and the high-voltage stability [64] will most likely have a non-neglegible effect.…”

Section: Discussionmentioning

confidence: 99%

“…Future experiments aim for a bound of ∼ 30 meV [60]. However, molecular effects and nuclear recoil have to be taken into account, which can possibly weaken the constraint on the endpoint [62].…”

Section: Constrained Endpointmentioning

confidence: 99%

Statistical sensitivity on right-handed currents in presence of eV scale sterile neutrinos with KATRIN

Steinbrink

Glück

Heizmann

et al. 2017

J. Cosmol. Astropart. Phys.

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The KATRIN experiment aims to determine the absolute neutrino mass by measuring the endpoint region of the tritium β-spectrum. As a large-scale experiment with a sharp energy resolution, high source luminosity and low background it may also be capable of testing certain theories of neutrino interactions beyond the standard model (SM). An example of a non-SM interaction are right-handed currents mediated by righthanded W bosons in the left-right symmetric model (LRSM). In this extension of the SM, an additional SU(2) R symmetry in the high-energy limit is introduced, which naturally includes sterile neutrinos and predicts the seesaw mechanism. In tritium β decay, this leads to an additional term from interference between left-and right-handed interactions, which enhances or suppresses certain regions near the endpoint of the beta spectrum. In this work, the sensitivity of KATRIN to right-handed currents is estimated for the scenario of a light sterile neutrino with a mass of some eV. This analysis has been performed with a Bayesian analysis using Markov Chain Monte Carlo (MCMC). The simulations show that, in principle, KATRIN will be able to set sterile neutrino massdependent limits on the interference strength. The sensitivity is significantly increased if the Q value of the β decay can be sufficiently constrained. However, the sensitivity is not high enough to improve current upper limits from right-handed W boson searches at the LHC.

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“…On the other hand, calculations of and for β-decay of atoms in many-electron systems of complex molecules or for β-emitters imbedded into solids may also suffer from insufficient knowledge of the composition of the radioactive samples. Very recently, a detailed assessment of molecular effects on the determination of from tritium β-spectra has become available [85]. Since the discovery of neutrino oscillations, it is necessary also to consider the individual neutrino mass states in the analysis of the measured β-spectra using the formula (11) This is exemplified in Fig.…”

Section: Fig (5)mentioning

confidence: 99%

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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Assessment of molecular effects on neutrino mass measurements from tritiumβdecay

Abstract: 6The beta decay of molecular tritium currently provides the highest sensitivity in laboratory-based

Cited by 62 publications

References 100 publications

First operation of the KATRIN experiment with tritium

First operation of the KATRIN experiment with tritium

Statistical sensitivity on right-handed currents in presence of eV scale sterile neutrinos with KATRIN

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

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