First results of the experiment to search for 2β decay of 106Cd with 106CdWO4 crystal scintillator in coincidence with four crystals HPGe detector

V.I. Tretyak; P. Belli; R. Bernabei; V.B. Brudanin; F. Cappella; V. Caracciolo; R. Cerulli; D.M. Chernyak; F.A. Danevich; S. D’Angelo; A. Incicchitti; M. Laubenstein; V.M. Mokina; D.V. Poda; O.G. Polischuk; R.B. Podviyanuk; I.A. Tupitsyna

doi:10.1051/epjconf/20136501004

Proceedings

Open Access

EPJ Web of Conferences 65, 01004 (2014)
https://doi.org/10.1051/epjconf/20136501004

First results of the experiment to search for 2β decay of ¹⁰⁶Cd with ¹⁰⁶CdWO₄ crystal scintillator in coincidence with four crystals HPGe detector

V.I. Tretyak¹^a, P. Belli², R. Bernabei²^,3, V.B. Brudanin⁴, F. Cappella⁵^,6, V. Caracciolo⁷, R. Cerulli⁷, D.M. Chernyak¹, F.A. Danevich¹, S. D’Angelo²^,3, A. Incicchitti⁵, M. Laubenstein⁷, V.M. Mokina¹, D.V. Poda¹, O.G. Polischuk¹^,6, R.B. Podviyanuk¹ and I.A. Tupitsyna⁸

¹ Institute for Nuclear Research, MSP 03680 Kyiv, Ukraine
² Dipartimento di Fisica, Università di Roma “Tor Vergata”, I-00133 Rome, Italy
³ INFN sezione Roma “Tor Vergata” I-00133 Rome, Italy
⁴ Joint Institute for Nuclear Research, 141980 Dubna, Russia
⁵ Dipartimento di Fisica, Università di Roma “La Sapienza”, I-00185 Rome, Italy
⁶ INFN, sezione di Roma, I-00185 Rome, Italy
⁷ INFN, Laboratori Nazionali del Gran Sasso, I-67100 Assergi (AQ), Italy
⁸ Institute of Scintillation Materials, 61001 Kharkiv, Ukraine

^a e-mail: tretyak@kinr.kiev.ua

Published online: 10 January 2014

Abstract

An experiment to search for double beta processes in ¹⁰⁶Cd by using cadmium tungstate crystal scintillator enriched in ¹⁰⁶Cd (¹⁰⁶CdWO₄) in coincidence with the four crystals HPGe detector GeMulti is in progress at the STELLA facility of the Gran Sasso underground laboratory of INFN (Italy). The ¹⁰⁶CdWO₄ scintillator is viewed by a low-background photomultiplier tube through a lead tungstate crystal light-guide produced from deeply purified archaeological lead to suppress γ quanta from the photomultiplier tube. Here we report the first results of the experiment after 3233 hours of the data taking. A few new improved limits on double beta processes in ¹⁰⁶Cd are obtained, in particular T_1/2^2νεβ+ ≥ 8.4 × 10²⁰ yr at 90% C.L.

© Owned by the authors, published by EDP Sciences, 2014

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