Holmes

Alpert, Bradley K.; Balata, M.; Bennett, Douglas A.; Biasotti, M.; Boragno, C.; Brofferio, C.; Ceriale, V.; Corsini, D.; Day, Peter; Gerone, M. De; Dressler, R.; Faverzani, M.; Ferri, E.; Fowler, Joseph W.; Gatti, F.; Giachero, A.; Hays-Wehle, J. P.; Heinitz, S.; Hilton, G. C.; Köster, U.; Lusignoli, M.; Maino, M.; Mates, J. A. B.; Nisi, S.; Nizzolo, R.; Nucciotti, A.; Pessina, G.; Pizzigoni, G.; Puiu, A.; Ragazzi, S.; Reintsema, C. D.; Gomes, M. L.; Schmidt, D. R.; Schumann, D.; Sisti, M.; Swetz, Daniel S.; Terranova, F.; Ullom, Joel N.

doi:10.1140/epjc/s10052-015-3329-5

Cited by 144 publications

(64 citation statements)

References 37 publications

(39 reference statements)

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“…Since the description of the beta spectrum via the effective neutrino mass is still valid for KATRIN and Project 8, the posterior distributions of effective neutrino masses should be very suggestive for future experiments. Our results in this section can also be used for the electron-capture experiments ECHo [12], HOLMES [13] and NuMECS [14], if CPT is assumed to be conserved in the neutrino sector. For the similar analysis relevant for the effective neutrino masses in β and 0νββ decays, see Refs.…”

Section: Posterior Distributionsmentioning

confidence: 97%

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Effective neutrino masses in KATRIN and future tritium beta-decay experiments

2020

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Past and current direct neutrino mass experiments set limits on the so-called effective neutrino mass, which is an incoherent sum of neutrino masses and lepton mixing matrix elements. A classical form of the electron energy spectrum is often assumed. Alternative definitions of effective masses exist, and an exact relativistic spectrum is calculable. We quantitatively compare the validity of those different approximations as function of energy resolution and exposure in view of tritium beta decays in the KATRIN, Project 8 and PTOLEMY experiments. Furthermore, adopting the Bayesian approach, we present the posterior distributions of the effective neutrino masses by including current experimental information from neutrino oscillations, beta decay, neutrinoless double-beta decay and cosmological observations. Both linear and logarithmic priors for the smallest neutrino mass are assumed. *

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Section: Posterior Distributionsmentioning

confidence: 97%

“…In this work, we focus only on tritium beta-decay experiments. Similar analyses of the effective neutrino mass can be performed for the electron-capture decays of holmium, namely, e − + 163 Ho → ν e + 163 Dy, which are and will be investigated in the ECHo[12] and HOLMES[13], NuMECS[14] experiments.…”

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confidence: 98%

Effective neutrino masses in KATRIN and future tritium beta-decay experiments

2020

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“…We consider in particular the first two planned phases of the ECHo project, ECHo-1k and ECHo-1M [94,95]. Other 163 Ho experimental projects are HOLMES [96], which has a program to investigate small neutrino masses competitive with the ECHo program, and NuMECS [97], which at least for the moment is only aiming at a precise measurement of the 163 Ho decay spectrum.…”

Section: Jhep06(2016)061mentioning

confidence: 99%

Light sterile neutrino sensitivity of 163Ho experiments

Gastaldo

Giunti

Zavanin

2016

J. High Energ. Phys.

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Abstract:We explore the sensitivity of 163 Ho electron capture experiments to neutrino masses in the standard framework of three-neutrino mixing and in the framework of 3+1 neutrino mixing with a sterile neutrino which mixes with the three standard active neutrinos, as indicated by the anomalies found in short-baseline neutrino oscillations experiments. We calculate the sensitivity to neutrino masses and mixing for different values of the energy resolution of the detectors, of the unresolved pileup fraction and of the total statistics of events, considering the expected values of these parameters in the two planned stages of the ECHo project (ECHo-1k and ECHo-1M). We show that an extension of the ECHo-1M experiment with the possibility to collect 10 16 events will be competitive with the KATRIN experiment. This statistics will allow to explore part of the 3+1 mixing parameter space indicated by the global analysis of short-baseline neutrino oscillation experiments. In order to cover all the allowed region, a statistics of about 10 17 events will be needed.

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“…A different class of experiments motivating these designs are neutrino endpoint spectrometers such as HOLMES [6]. This experiment will measure the energy spectrum of electron capture decays of 163 Ho embedded directly in the detector.…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductance Engineering for High-Speed TES Microcalorimeters

et al. 2016

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Many current and future applications for superconducting transition-edge sensor (TES) microcalorimeters require significantly faster pulse response than is currently available. X-ray spectroscopy experiments at next-generation synchrotron light sources need to successfully capture very large fluxes of photons, while detectors at free-electron laser facilities need pulse response fast enough to match repetition rates of the source. Additionally, neutrino endpoint experiments such as HOLMES need enormous statistics, yet are extremely sensitive to pile-up effects that can distort spectra. These issues can be mitigated only by fast rising and falling edges. To address these needs, we have designed high-speed TES detectors with novel geometric enhancements to increase the thermal conductance of pixels suspended on silicon nitride membranes. This paper shows that the thermal conductivity can be precisely engineered to values spanning over an order of magnitude to achieve fast thermal relaxation times tailored to the relevant applications. Using these pixel prototypes, we demonstrate decay time constants faster than 100 μs, while still maintaining spectral resolution of 3 eV FWHM at 1.5 keV. This paper also discusses the trade-offs inherent in reducing the pixel time constant, such as increased bias current leading to degradation in energy resolution, and potential modifications to improve performance.

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Holmes

Cited by 144 publications

References 37 publications

Effective neutrino masses in KATRIN and future tritium beta-decay experiments

Effective neutrino masses in KATRIN and future tritium beta-decay experiments

Light sterile neutrino sensitivity of 163Ho experiments

Thermal Conductance Engineering for High-Speed TES Microcalorimeters

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