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

doi:10.1117/12.450760

18 December 2001 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

Author Affiliations +

Proceedings Volume 4507, Hard X-Ray and Gamma-Ray Detector Physics III; (2001) https://doi.org/10.1117/12.450760
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

High-Z low-temperature calorimeters are developed by an Italian collaboration (Milano-Como-Gran Sasso Underground Laboratories) in order to search for rare nuclear events and Dark Matter massive candidates. They exhibit an excellent energy resolution, close to that of Ge-diodes, but a much higher efficiency. Different high-Z materials were initially employed . A many-years optimisation work on tellurium oxide (TeO2) lead to impressive results: devices with total masses around 750 g present FWHM energy resolutions on gamma-ray peaks ranging from 1 KeV (close to the 5 KeV energy threshold) to 2.6 KeV at 2615 KeV (208Tl gamma line). A 3.2 KeV FWHM energy resolution was obtained at 5.4 MeV (210Po alpha line), which is by far the best one ever achieved with any alpha detector. These devices, operated at about 10 mK, consist of a TeO2 single crystal thermally coupled to a 50 mg Neutron Transmutation Doped (NTD) Ge crystal working as a temperature sensor. Special care was devoted to methods for response linearization and temporal stabilisation. Devices based on the same principle and specifically optimised could find applications in several fields like gamma-ray astrophysics, nuclear physics searches, environmental monitoring and radiation metrology.

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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, and Luigi Zanotti "Low-temperature high-Z gamma-detectors with very high energy resolution", Proc. SPIE 4507, Hard X-Ray and Gamma-Ray Detector Physics III, (18 December 2001); https://doi.org/10.1117/12.450760

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KEYWORDS

Crystals

Sensors

Calibration

Tellurium

Electronics

Polonium

Bolometers

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