Dr. Marisa Pedretti Profile

Dr. Marisa Pedretti

at Univ degli Studi dell'Insubria

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Publications (4)

Proceedings Article | 24 September 2007 Paper

Surface sensitivity in large mass bolometers: discrimination of the origin of events

C. Salvioni, O. Cremonesi, L. Foggetta, A. Giachero, A. Giuliani, P. Gorla, C. Nones, M. Pavan, M. Pedretti, S. Sangiorgio

Proceedings Volume 6706, 67061I (2007) https://doi.org/10.1117/12.740300

KEYWORDS: Sensors, Bolometers, Single sideband modulation, Particles, Silicon, Crystals, Surface plasmons, Physics, Phonons, Spatial resolution

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Proceedings Article | 21 October 2004 Paper

Innovations in low-temperature calorimeters: surface sensitive bolometers for background rejection and capacitive bolometers for higher energy resolution

Samuele Sangiorgio, Marco Barucci, Luca Foggetta, Andrea Giuliani, Giancarlo Jug, Claudia Nones, Edoardo Pasca, Marisa Pedretti, Gianluigi Pessina, Lara Risegari, Emiliano Olivieri, Guglielmo Ventura

Proceedings Volume 5540, (2004) https://doi.org/10.1117/12.579846

KEYWORDS: Sensors, Bolometers, Germanium, Capacitors, Particles, Crystals, Dielectrics, Composites, Silicon, Phonons

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Proceedings Article | 20 January 2004 Paper

Large mass bolometers for neutrinoless double beta decay detection: model and last results

Marisa Pedretti, Marco Barucci, Andrea Giuliani, Edoardo Pasca, Lara Risegari, Emiliano Olivieri, Guglielmo Ventura

Proceedings Volume 5198, (2004) https://doi.org/10.1117/12.505231

KEYWORDS: Sensors, Bolometers, Crystals, Phonons, Thermal modeling, Particles, Temperature metrology, Electroluminescence, Tellurium, Gold

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Milano collaboration has been developing for many years large mass bolometers for particle detection, and in particular for the study of neutrinoless double beta decay of ¹³⁰Te. The active components of the detectors are large mass (340 g and 790 g) TeO₂ crystals, while Neutron Transmutation Doped Ge thermistors are used as phonon sensors. These devices work at low temperatures, about 5-10 mK. The mechanical and thermal connections of the detector to the thermal bath are made with PTFE pieces that hold the crystal on copper frames. Gold wires are used as electric connections. We have developed a complete thermal model for the bolometers and "ad hoc" measurements of the thermal parameters involved were performed in the Florence cryogenic laboratory. These studies have permitted to simulate the static and dynamic behaviours of the detectors. A satisfactory agreement between simulated and the experimental response has been obtained as far as the static behaviour is concerned, while the dynamic behaviour is not yet fully understood. These preliminary results however will enable us to design new detector structures in order to improve the signal-to-noise ratio and the reproducibility. Given the good performances of these devices (excellent energy resolutions were obtained, of the order of 2 keV at 911 keV and of 5 keV at 2615 keV), this technique is particularly suitable to detectors for gamma ray spectroscopy. Encouraged by this results, the Milano-Como group has joined a large international collaboration for the realization of CUORE (Cryogenic Underground Observatory for Rare Events), seraching for Dark Matter and neutrinoless Double Beta Decay, a crucial phenomenon for neutrino physics. The Cuoricino detector, a small scale test of CUORE detector, is an array of 62 large mass bolometers like those already described, and it is now in operation in the Gran Sasso undergrand laboratory (Italy). It is the largest array of bolometric detectors ever constructed.

Proceedings Article | 18 December 2001 Paper

Low-temperature high-Z gamma-detectors with very high energy resolution

Carlos Pobes, Chiara Brofferio, Carlo Bucci, Oliviero Cremonesi, Ettore Fiorini, Andrea Giuliani, Angelo Nucciotti, Maura Pavan, Marisa Pedretti, Gianluigi Pessina, Stefano Pirro, Ezio Previtali, Monica Sisti, Marco Vanzini, Luigi Zanotti

Proceedings Volume 4507, (2001) https://doi.org/10.1117/12.450760

KEYWORDS: Crystals, Sensors, Tellurium, Calibration, Polonium, Electronics, Gamma radiation, Thallium, Bolometers, Particles

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