PoS - Proceedings of Science
Volume 402 - The 22nd International Workshop on Neutrinos from Accelerators (NuFact2021) - All Sessions
Status of the HOLMES experiment: commissioning of the ion implanter
G. Gallucci*, A. Bevilacqua, M. Biasotti, M. Borghesi, N. Cerboni, G. Ceruti, G. De Bodin De Galembert, M. De Gerone, M. Faverzani, M. Fedkevych, E. Ferri, F. Gatti, A. Giachero, E.A. Maugeri, P. Manfrinetti, A. Nucciotti, L. Parodi, G. Pessina, D. Schumann and F. Siccardi
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Published on: March 31, 2022
The measurement of ν masses is an opening issue in particle physics. The study of the end point of beta decay is the best experimental way to provide a model indipendent mea- surement. The HOLMES experiment aims at directly measurment of the neutrino mass with a calorimetric approach studying the 163Ho electron-capture decay . The very low Q-value (2.8 keV),the half-life (4570 y) and the proximity of the end-point to resonance M1 make the 163Ho decay a very good choice but there are two critical steps. The first step is em- bending of the source inside the criogenic microcalorimeters so that the energy released in the decay process is entirely contained, except for the fraction taken away by the neutrino. The second one is the rejection of 166Ho radioactive isotope that could produce fake signal in the region of interest. For this two reasons a dedicated implanter with a sputter ion source, an acceleration section (until 50 keV) and a magnetic dipole has been design and devel- oped. The implanter calibration and performances have been evaluated using 63Cu/65Cu and 197Au beams. Different holmium coumponds are being tested to find the best efficiency in the sputter process. This work will show the stauts of the machine development and commisiong.
DOI: https://doi.org/10.22323/1.402.0161
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