Physics Letters B (Apr 2017)
Enriched TeO2 bolometers with active particle discrimination: Towards the CUPID experiment
- D.R. Artusa,
- F.T. Avignone, III,
- J.W. Beeman,
- I. Dafinei,
- L. Dumoulin,
- Z. Ge,
- A. Giuliani,
- C. Gotti,
- P. de Marcillac,
- S. Marnieros,
- S. Nagorny,
- S. Nisi,
- C. Nones,
- E.B. Norman,
- V. Novati,
- E. Olivieri,
- D. Orlandi,
- L. Pagnanini,
- L. Pattavina,
- G. Pessina,
- S. Pirro,
- D.V. Poda,
- C. Rusconi,
- K. Schäffner,
- N.D. Scielzo,
- Y. Zhu
Affiliations
- D.R. Artusa
- INFN – Laboratori Nazionali del Gran Sasso, I-67010, Assergi, Italy
- F.T. Avignone, III
- Dept. of Physics and Astronomy, University of South Carolina, SC 29208, Columbia, USA
- J.W. Beeman
- Materials Science Division, Lawrence Berkeley National Laboratory, CA 94720, Berkeley, USA
- I. Dafinei
- INFN – Sezione di Roma, I-00185, Roma, Italy
- L. Dumoulin
- CSNSM, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405, Orsay, France
- Z. Ge
- Shanghai Institute of Ceramics – Chinese Academy of Sciences, Jiading district, 201800, Shanghai, PR China
- A. Giuliani
- CSNSM, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405, Orsay, France
- C. Gotti
- INFN – Sezione di Milano Bicocca, I-20126, Milano, Italy
- P. de Marcillac
- CSNSM, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405, Orsay, France
- S. Marnieros
- CSNSM, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405, Orsay, France
- S. Nagorny
- INFN – Gran Sasso Science Institute, I-67100, L'Aquila, Italy
- S. Nisi
- INFN – Laboratori Nazionali del Gran Sasso, I-67010, Assergi, Italy
- C. Nones
- CEA Saclay, DSM/IRFU, 91191 Gif-sur-Yvette Cedex, France
- E.B. Norman
- Dept. of Nuclear Engineering, University of California, CA 94720, Berkeley, USA
- V. Novati
- CSNSM, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405, Orsay, France
- E. Olivieri
- CSNSM, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405, Orsay, France
- D. Orlandi
- INFN – Laboratori Nazionali del Gran Sasso, I-67010, Assergi, Italy
- L. Pagnanini
- INFN – Gran Sasso Science Institute, I-67100, L'Aquila, Italy
- L. Pattavina
- INFN – Laboratori Nazionali del Gran Sasso, I-67010, Assergi, Italy
- G. Pessina
- INFN – Sezione di Milano Bicocca, I-20126, Milano, Italy
- S. Pirro
- INFN – Laboratori Nazionali del Gran Sasso, I-67010, Assergi, Italy
- D.V. Poda
- CSNSM, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405, Orsay, France
- C. Rusconi
- INFN – Sezione di Milano Bicocca, I-20126, Milano, Italy
- K. Schäffner
- INFN – Gran Sasso Science Institute, I-67100, L'Aquila, Italy
- N.D. Scielzo
- Lawrence Livermore National Laboratory – Nuclear and Chemical Sciences Division, CA 94550, Livermore, USA
- Y. Zhu
- Shanghai Institute of Ceramics – Chinese Academy of Sciences, Jiading district, 201800, Shanghai, PR China
- DOI
- https://doi.org/10.1016/j.physletb.2017.02.011
- Journal volume & issue
-
Vol. 767,
no. C
pp. 321 – 329
Abstract
We present the performances of two 92% enriched 130TeO2 crystals operated as thermal bolometers in view of a next generation experiment to search for neutrinoless double beta decay of 130Te. The crystals, 435 g each, show an energy resolution, evaluated at the 2615 keV γ-line of 208Tl, of 6.5 and 4.3 keV FWHM. The only observable internal radioactive contamination arises from 238U (15 and 8 μBq/kg, respectively). The internal activity of the most problematic nuclei for neutrinoless double beta decay, 226Ra and 228Th, are both evaluated as <3.1 μBq/kg for one crystal and <2.3 μBq/kg for the second. Thanks to the readout of the weak Cherenkov light emitted by β/γ particles by means of Neganov–Luke bolometric light detectors we were able to perform an event-by-event identification of β/γ events with a 95% acceptance level, while establishing a rejection factor of 98.21% and 99.99% for α particles.
Keywords
