Search for double-βdecay processes in106Cd with the help of a106CdWO

P. Belli

¹

,

R. Bernabei

²

,

R. S. Boiko

³

et al.

Abstract

A search for double β processes in 106 Cd was carried out at the Gran Sasso National Laboratories of the INFN (Italy) with the help of a 106 CdWO 4 crystal scintillator (215 g) enriched in 106 Cd up to 66%. After 6590 h of data taking, new improved half-life limits on the double β decay processes in 106 Cd were established at the level of 10 19 -10 21 yr; in particular, T 2νεβ +

First test of an enriched $$^{116}$$ 116 CdWO $$_4$$ 4 scintillating bolometer for neutrinoless double-beta-decay searches

“…Recently, high-quality radiopure CdWO 4 crystal scintillators were developed from deeply-purified cadmium samples enriched in the isotopes 106 Cd [29] and 116 Cd [30] with the help of the low-thermal-gradient Czochralski crystal-growth technique [31]. These enriched scintillators are currently and succesfully used in the 0ν2β decay experiments with 106 Cd [32,33] and 116 Cd [34,35]. Important advantages of the low-thermal-gradient Czochralski method are a high yield of the crystal boules (≈ 87%) and an acceptable low level of irrecoverable losses of enriched cadmium (≈ 2%).…”

New limits on 2β processes in106Cd

“…Contributions of possible radioactive sources to the collected spectra were simulated with the EGS4 code [25]. The list includes, in particular, radioactive contaminations of the 106 CdWO 4 crystal scintillator [21], external γ quanta from the PMT and materials of the set-up, and also 2β2ν decay of 116 Cd present in the 106 CdWO 4 crystal on the level of 1.5% [22]. Fit of the 106 CdWO 4 anticoincidence spectrum by the background model, and its main components are shown in Fig.…”

“…In recent searches for 2β decay of 106 Cd, 32 planar HPGe detectors and 16 thin 106 Cd metallic foils between them were used in the TGV-2 experiment [19], and array of CdZnTe room temperature semiconductors was used in the COBRA studies [20]. At the first stage of our investigations [21], 106 CdWO 4 crystal enriched in 106 Cd to 66% with mass of 216 g was used as a scintillating detector. At the second stage, described here, it is operated in low background setup together with four HPGe detectors enhancing sensitivity to some 2β processes with emission of γ quanta.…”

Uncertainties in nuclear transition matrix elements forβ+β+andɛβ+modes of neutrinoless positron double-Rath1, Chandra2, Chaturvedi3 et al. 2013Phys. Rev. C110100View full textAdd to dashboardCite

“…Subsequently, detailed theoretical studies on the resonant enhancement of (εε) 0ν mode have also been performed [8,9]. In the mean time, experimental studies on resonance enhancement of (εε) 0ν mode in 74 Ge [10,11], 96 Ru [12], 106 Cd [13,14], 112 Sn [15][16][17][18][19], 136 Ce [20], and 180 W [21] isotopes have already been carried out and the study of this (εε) 0ν mode is emerging as an interesting possibility for the investigation of (ββ) 0ν decay.…”