HOLMES is a new experiment to directly measure the neutrino mass with a sensitivity as low as 0.4 eV. HOLMES will perform a calorimetric measurement of the energy released in the electron capture decay of 163Ho. HOLMES will deploy a large array of low temperature microcalorimeters with implanted 163Ho nuclei. HOLMES baseline detector is an array of 1000 microcalorimeters each with an implanted 163Ho activity of about 300 Bq, an energy resolution FWHM of about 1 eV at the spectrum end-point (Q≈2.5 keV), and a time resolution of about 1 μs. Matching these performances requires a careful optimization of all components, from the microcalorimeters to the signal processing algorithms. We outline here the project technical challenges and the present status of the development.
Nucciotti, A., Alpert, B., Becker, D., Bennett, D., Biasotti, M., Brofferio, C., et al. (2016). Status of the HOLMES detector development. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT, 824, 182-183 [10.1016/j.nima.2015.09.066].
Status of the HOLMES detector development
NUCCIOTTI, ANGELO ENRICO LODOVICO
Primo
;BROFFERIO, CHIARA;DAY, PETER KENNETH;FAVERZANI, MARCO;FERRI, ELENA;GIACHERO, ANDREA;MAINO, MATTEO;PESSINA, GIANLUIGI EZIO;PUIU, PAUL ANDREI;RAGAZZI, STEFANO;SISTI, MONICA;TERRANOVA, FRANCESCO;
2016
Abstract
HOLMES is a new experiment to directly measure the neutrino mass with a sensitivity as low as 0.4 eV. HOLMES will perform a calorimetric measurement of the energy released in the electron capture decay of 163Ho. HOLMES will deploy a large array of low temperature microcalorimeters with implanted 163Ho nuclei. HOLMES baseline detector is an array of 1000 microcalorimeters each with an implanted 163Ho activity of about 300 Bq, an energy resolution FWHM of about 1 eV at the spectrum end-point (Q≈2.5 keV), and a time resolution of about 1 μs. Matching these performances requires a careful optimization of all components, from the microcalorimeters to the signal processing algorithms. We outline here the project technical challenges and the present status of the development.
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