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Proceedings Paper

Surface sensitivity in large mass bolometers: discrimination of the origin of events
Author(s): C. Salvioni; O. Cremonesi; L. Foggetta; A. Giachero; A. Giuliani; P. Gorla; C. Nones; M. Pavan; M. Pedretti; S. Sangiorgio
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Paper Abstract

During the last decades, low temperature detectors have undergone a considerable growth and are now widely acknowledged as useful instruments in many fundamental physics experiments. In this field, the phonon mediated particle detectors known as bolometers are remarkable and are successfully used in various branches of physics research for their good sensitivity, energy resolution and flexibility in the choice of the constituting materials. Bolometers have proved to be powerful devices for radiation detection; in particular, they are able to detect Gamma-rays with resolutions comparable to those obtained with the best Ge diodes. They are also suited for applications in the area of nuclear and particle physics, like the study of rare events or dark matter. Although an effective technique, the use of bolometers in the specific field of the search for neutrinoless double beta decay is affected by the lack of spatial resolution. This results in the expected signal of this rare decay hidden under an indistinguishable background due to possible surface radioactive contaminations in the materials facing the detectors. An approach to this problem is to make bolometers surface sensitive by applying ultra-pure crystalline foils on the main detector through direct thermal contact and by operating them as active shields. In this contribution we present for the first time surface sensitivity achieved with large mass TeO2 bolometers (~800 g) operated underground at ~10 mK, dedicated to the detection of neutrinoless double beta decay of 130Te. Our encouraging measurements suggest that this could be a viable method for the discrimination of background events.

Paper Details

Date Published: 24 September 2007
PDF: 10 pages
Proc. SPIE 6706, Hard X-Ray and Gamma-Ray Detector Physics IX, 67061I (24 September 2007); doi: 10.1117/12.740300
Show Author Affiliations
C. Salvioni, Univ. dell'Insubria (Italy)
O. Cremonesi, Univ. di Milano-Bicocca (Italy)
L. Foggetta, Istituto Nazionale di Fisica Nucleare (Italy)
A. Giachero, Lab. Nazionali del Gran Sasso, INFN (Italy)
Univ. di Genova (Italy)
A. Giuliani, Univ. dell'Insubria (Italy)
P. Gorla, Lab. Nazionali del Gran Sasso, INFN (Italy)
C. Nones, Univ. di Milano-Bicocca (Italy)
CSNSM, CNRS, Univ. Paris XI (France)
M. Pavan, Univ. di Milano-Bicocca (Italy)
M. Pedretti, Istituto Nazionale di Fisica Nucleare (Italy)
S. Sangiorgio, Univ. dell'Insubria (Italy)

Published in SPIE Proceedings Vol. 6706:
Hard X-Ray and Gamma-Ray Detector Physics IX
Ralph B. James; Arnold Burger; Larry A. Franks, Editor(s)

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