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Proceedings Paper

Low-temperature high-Z gamma-detectors with very high energy resolution
Author(s): 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
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Paper 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.

Paper Details

Date Published: 18 December 2001
PDF: 8 pages
Proc. SPIE 4507, Hard X-Ray and Gamma-Ray Detector Physics III, (18 December 2001); doi: 10.1117/12.450760
Show Author Affiliations
Carlos Pobes, Univ. degli Studi di Milano and INFN (Italy)
Chiara Brofferio, Univ. degli Studi di Milano and INFN (Italy)
Carlo Bucci, INFN (Italy)
Oliviero Cremonesi, INFN (Italy)
Ettore Fiorini, Univ. degli Studi di Milano and INFN (Italy)
Andrea Giuliani, Univ. degli Studi dell'Insubria (Italy)
Angelo Nucciotti, INFN (Italy)
Maura Pavan, Univ. degli Studi di Milano and INFN (Italy)
Marisa Pedretti, INFN and Univ. degli Studi dell'Insubria (Italy)
Gianluigi Pessina, INFN (Italy)
Stefano Pirro, Univ. degli Studi di Milano and INFN (Italy)
Ezio Previtali, INFN (Italy)
Monica Sisti, INFN (Italy)
Marco Vanzini, Univ. degli Studi di Milano and INFN (Italy)
Luigi Zanotti, Univ. degli Studi di Milano and INFN (Italy)

Published in SPIE Proceedings Vol. 4507:
Hard X-Ray and Gamma-Ray Detector Physics III
Ralph B. James, Editor(s)

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