Abstract
The microcalorimeter array for a rhenium experiment (MARE) project aims at the direct and calorimetric measurement of the electron neutrino mass with sub-eV sensitivity. The design is based on large arrays of thermal detectors to study the beta decay of \(^{187}\)Re and the electron capture of \(^{163}\)Ho. One of the activities of the project, MARE 1 in Milan, has started in Milan using one array of 6 \(\times \) 6 silicon implanted thermistors equipped with AgReO\(_4\) absorbers. The purposes of MARE 1 in Milan are to achieve a sensitivity on the neutrino mass of a few eV and to investigate the systematics of \(^{187}\)Re neutrino mass measurements, focusing on those caused by the beta environmental fine structure and the beta spectrum theoretical shape. In parallel, the MARE collaboration is performing an R&D work for producing absorbers embedded with radioactive metal \(^{163}\)Ho. We report here the status of MARE using Re as beta source and the preliminary results obtained with \(^{163}\)Ho.
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Notes
The Al and Ti microbridges which electrically connect the detectors to the JFET are low thermal conductance wires produced by Memsrad/FBK in Trento, Italy. They consist of silicon chips with metal traces evaporated on free-standing, serpentine polymide. The serpentine is 20 \(\upmu \)m wide and about 5 mm long. The microbridge production is based on photolitographic technique and it takes place in several steps.
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Acknowledgments
These activities are supported by Fondazione Cariplo through the project Development of Microresonator Detectors for Neutrino Physics (Grant 2010-2351). The MARE-Ho work was partially supported by the Marie Curie Actions (FP7-PEOPLE-2007-2-2-ERG) and FCT-Portugal programs (Project PTDC-FIS-116719-2010).
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Ferri, E., Bagliani, D., Biassotti, M. et al. Preliminary Results of the MARE Experiment. J Low Temp Phys 176, 885–890 (2014). https://doi.org/10.1007/s10909-013-1026-z
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DOI: https://doi.org/10.1007/s10909-013-1026-z