Ultralow<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Q</mml:mi></mml:mrow></mml:math>values for neutrino mass measurements

Merle, Alexander

doi:10.1103/physrevc.81.045501

Cited by 16 publications

(12 citation statements)

References 19 publications

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“…With experiments based on 163 Ho it appears possible to reach, for the electron neutrino mass, the same sensitivity which tritium based experiments, as KATRIN [129,897] can achieve for the electron anti-neutrino mass. 163 Ho is considered the best candidate among all nuclides undergoing electron capture processes to be used in an experiment for the investigation of the neutrino mass because of its extremely low energy available to the decay, Q EC = 2.833 ± 0.030 stat ± 0.015 syst keV [926,927]. Such a low Q EC allows for a reasonable fraction of counts in the endpoint region of the spectrum to be analyzed for identifying effects due to a finite effective neutrino mass.…”

Section: Electron Capture Experiments (Author: L Gastaldo)mentioning

confidence: 99%

A White Paper on keV sterile neutrino Dark Matter

Adhikari

Agostini

et al. 2017

J. Cosmol. Astropart. Phys.

380

316

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Abstract. We present a comprehensive review of keV-scale sterile neutrino Dark Matter, collecting views and insights from all disciplines involved -cosmology, astrophysics, nuclear, and particle physics -in each case viewed from both theoretical and experimental/observational perspectives. After reviewing the role of active neutrinos in particle physics, astrophysics, and cosmology, we focus on sterile neutrinos in the context of the Dark Matter puzzle. Here, we first review the physics motivation for sterile neutrino Dark Matter, based on challenges and tensions in purely cold Dark Matter scenarios. We then round out the discussion by critically summarizing all known constraints on sterile neutrino Dark Matter arising from astrophysical observations, laboratory experiments, and theoretical considerations. In this context, we provide a balanced discourse on the possibly positive signal from X-ray observations. Another focus of the paper concerns the construction of particle physics models, aiming to explain how sterile neutrinos of keV-scale masses could arise in concrete settings beyond the Standard Model of elementary particle physics. The paper ends with an extensive review of current and future astrophysical and laboratory searches, highlighting new ideas and their experimental challenges, as well as future perspectives for the discovery of sterile neutrinos.

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Section: Electron Capture Experiments (Author: L Gastaldo)mentioning

confidence: 99%

A White Paper on keV sterile neutrino Dark Matter

Adhikari

Agostini

et al. 2017

J. Cosmol. Astropart. Phys.

380

316

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“…(5), a finite value of the neutrino mass appreciably influences the β-spectrum only in its uppermost narrow region comparable with There might be β-transitions to an excited state of the daughter nucleus exhibiting extremely low decay energy Q β and thus a high sensitivity to . Kopp and Merle [167] discussed several candidate isotopes undergoing β ± , bound state β, or electron-capture decay. The authors also showed that partial ionization of the parent atom could help tune Q β values to << 1 keV since every spectator atomic electron contributes to Q β with its energy gain or loss caused by the change of the nuclear charge during the β-decay.…”

Section: β-Transitions To An Excited State Of a Daughter Nucleusmentioning

confidence: 99%

“…(23). A change of the decay energy by ionization of the parent iridium atom [167]. The figure demonstrates the magnitude of changes but, due to a large uncertainty in the decay energy, it is only illustrative.…”

Section: β-Transitions To An Excited State Of a Daughter Nucleusmentioning

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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“…Ultra-low Q-value β-decays, in which the parent nucleus decays to an excited state in the daughter with a Q-value of less than 1 keV, provide a powerful tool to test the role of atomic interference effects in nuclear βdecay [1,2]. They can also potentially be used as new candidates for direct neutrino mass determination experiments [3][4][5][6]. In order for a potential ultra-low Q-value decay to be identified or ruled out, precise measurements of the ground-state to ground-state Q-value as well as the excited state energy levels of the daughter nucleus are necessary.…”

Section: Introductionmentioning

confidence: 99%

“…Since the discovery of the ultra-low Q-value β-decay of 115 In, other potential ultra-low Q-value decay branches were identified in 115 Cd [13], 135 Cs [14], and a number of other isotopes [5,6,15,16]. However, in all of the identified cases, more precise atomic mass data is required for the parent and/or daughter isotope.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the potential ultralow Q -value β -decay candidates Sr89 and Ba

et al. 2019

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Background: Ultra-low Q-value β-decays are interesting processes to study with potential applications to nuclear β-decay theory and neutrino physics. While a number of potential ultra-low Q-value β-decay candidates exist, improved mass measurements are necessary to determine which of these are energetically allowed.Purpose: To perform precise atomic mass measurements of 89 Y and 139 La. Use these new measurements along with the precisely known atomic masses of 89 Sr and 139 Ba and nuclear energy level data for 89 Y and 139 La to determine if there could be an ultra-low Q-value decay branch in the β-decay of 89 Sr → 89 Y or 139 Ba → 139 La.Method: High-precision Penning trap mass spectrometry was used to determine the atomic mass of 89 Y and 139 La, from which β-decay Q-values for 89 Sr and 139 Ba were obtained.Results: The 89 Sr → 89 Y and 139 Ba → 139 La β-decay Q-values were measured to be QSr = 1502.20(0.35) keV and QBa = 2308.37(0.68) keV. These results were compared to energies of excited states in 89 Y at 1507.4(0.1) keV, and in 139 La at 2310(19) keV and 2313(1) keV to determine Q-values of -5.20(0.37) keV for the potential ultra-low β-decay branch of 89 Sr and -1.6(19.0) keV and -4.6(1.2) keV for those of 139 Ba. Conclusion:The potential ultra-low Q-value decay branch of 89 Sr to the 89 Y (3/2 − , 1507.4 keV) state is energetically forbidden and has been ruled out. The potential ultra-low Q-value decay branch of 139 Ba to the 2313 keV state in 139 La with unknown J π has also been ruled out at the 4σ level, while more precise energy level data is needed for the 139 La (1/2 + , 2310 keV) state to determine if an ultra-low Q-value β-decay branch to this state is energetically allowed. * sandler@nscl.msu.edu 1 The energy of the 115 Sn (3/2 + ) state was recently measured more precisely to be 497.342 (3) keV [7].

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UltralowQvalues for neutrino mass measurements

Cited by 16 publications

References 19 publications

A White Paper on keV sterile neutrino Dark Matter

A White Paper on keV sterile neutrino Dark Matter

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

Investigation of the potential ultralow Q -value β -decay candidates Sr89 and Ba

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