New limits from the Milano neutrino mass experiment with thermal microcalorimeters

Sisti, M.; Arnaboldi, C.; Brofferio, C.; Ceruti, G.; Cremonesi, O.; Fiorini, E.; Giuliani, A.; Margesin, B.; Mårtensson, L.; Nucciotti, A.; Pavan, M.; Pessina, G.; Pirro, S.; Previtali, E.; Soma, L.; Zen, M.

doi:10.1016/j.nima.2003.11.273

Cited by 83 publications

(40 citation statements)

References 6 publications

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“…The MIBETA experiment with AgReO microcalorimeters [19, 20] observed a flat background of about count/eV/day/detector between 0 and about 5 keV. Geant4 Monte Carlo simulations show that – thanks to the combined effect of smaller volume and larger of the bismuth absorbers –, the contribution to the counting rate below 10 keV for incident s of any energy between 10 keV and 3 MeV is lower in HOLMES than in MIBETA.…”

Section: Sensitivitymentioning

confidence: 99%

“…Several investigations have been carried out on microcalorimeters for a calorimetric neutrino mass measurement with Re. About 10 years ago, two small scale pilot experiments were carried out with thermal detectors containing Re: the MANU [17, 18] and MIBETA [19, 20] experiments. Both experiments collected a statistics of about decays, yielding a limit on of about 15 eV at 90 % CL.…”

Section: Introductionmentioning

confidence: 99%

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Holmes

et al. 2015

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The European Research Council has recently funded HOLMES, a new experiment to directly measure the neutrino mass. HOLMES will perform a calorimetric measurement of the energy released in the decay of Ho. The calorimetric measurement eliminates systematic uncertainties arising from the use of external beta sources, as in experiments with beta spectrometers. This measurement was proposed in 1982 by A. De Rujula and M. Lusignoli, but only recently the detector technological progress allowed to design a sensitive experiment. HOLMES will deploy a large array of low temperature microcalorimeters with implanted Ho nuclei. The resulting mass sensitivity will be as low as 0.4 eV. HOLMES will be an important step forward in the direct neutrino mass measurement with a calorimetric approach as an alternative to spectrometry. It will also establish the potential of this approach to extend the sensitivity down to 0.1 eV. We outline here the project with its technical challenges and perspectives.

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Section: Sensitivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Holmes

et al. 2015

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“…In case of the latter, the Mainz and Troitsk experiments for 3 H beta decay yielded the upper limits of electron antineutrino mass at 2.3 eV [11] and 2.05 eV [12], respectively, while the KATRIN experiment is expected to have a sensitivity down to 0.2 eV [13]. The 187 Re beta-decay bolometric experiments resulted in upper limits for neutrino mass of 26 eV [14] and 15 eV [15]. The 163 Ho (electron capture) neutrino experiments yielded higher upper limits of 225 eV [16] and 490 eV [17] and efforts are in progress to lower these limits in the ECHO experiment [6].…”

Section: Introductionmentioning

confidence: 99%

Integral Equations in Neutrino Mass Searches from Beta Decay

Semkow¹,

Li²

2019

JAMP

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A new mathematical method for elucidating neutrino mass from beta decay is studied. It is based upon the solutions of transformed Fredholm and Volterra integral equations. In principle, theoretical beta-particle spectra can consist of several neutrino-mass eigenvalues. Integration of the theoretical beta spectrum with a normalized instrumental response function results in the Fredholm integral equation of the first kind. This equation is transformed in such a way that the solution of it is a superposition of the Heaviside step-functions, one for each neutrino mass eigenvalue. A series expansion leading to matrix linear equations is then derived to solve the transformed Fredholm equation. Another approach is derived when the theoretical beta spectrum is obtained by a separate deconvolution of the observed spectrum. It is then proven that the transformed Fredholm equation reduces to the Abel integral equation. The Abel equation has a general integral solution, which is proven in this work by using a specific function for the beta spectrum. As an example, a numerical solution of the Abel integral equation is also provided, which has a fractional sensitivity of about 10 -3 for subtle neutrino eigenvalue searches, and can distinguish from experimental beta-spectrum discrepancies, such as shape and energy nonlinearities.

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“…[3][4][5][6] Microcalorimeters are now a mature and effective technology for radiation detection and are been used in several fields. Although a neutrino calorimetric experiment is not affected by the many systematic uncertainties that plagued electrostatic spectrometers in the past, the very nature of the experiment requires that all decays are being measured, not only those with energy near the end-point.…”

Section: Introductionmentioning

confidence: 99%

“…To maximize the useful experimental statistics, a calorimetric experiment thus requires an isotope with very low end-point energy, hence 187 Re, with end-point energy of about 2.5 keV, is chosen. [3][4][5][6] Electron capture (EC) decays with low Q-values could be used as an alternative to single beta decay for the direct determination of the effective electron neutrino mass. The most appealing suggestion considers a calorimetric experiment 7 and the EC decay of 163 Ho to 163 Dy is the decay with the lowest known Q-value.…”

Section: Introductionmentioning

confidence: 99%

Thermal properties of holmium-implanted gold films for a neutrino mass experiment with cryogenic microcalorimeters

Prasai

Alves

Bagliani

et al. 2013

Review of Scientific Instruments

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In a microcalorimetric neutrino mass experiment using the radioactive decay of (163)Ho, the radioactive material must be fully embedded in the microcalorimeter absorber. One option that is being investigated is to implant the radioactive isotope into a gold absorber, as gold is successfully used in other applications. However, knowing the thermal properties at the working temperature of microcalorimeters is critical for choosing the absorber material and for optimizing the detector performance. In particular, it is paramount to understand if implanting the radioactive material in gold changes its heat capacity. We used a bolometric technique to measure the heat capacity of gold films, implanted with various concentrations of holmium and erbium (a byproduct of the (163)Ho fabrication), in the temperature range 70 mK-300 mK. Our results show that the specific heat capacity of the gold films is not affected by the implant, making this a viable option for a future microcalorimeter holmium experiment.

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New limits from the Milano neutrino mass experiment with thermal microcalorimeters

Cited by 83 publications

References 6 publications

Holmes

Holmes

Integral Equations in Neutrino Mass Searches from Beta Decay

Thermal properties of holmium-implanted gold films for a neutrino mass experiment with cryogenic microcalorimeters

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