In this work, we present the first complex study of CsZrCl (CZC) scintillating crystals in terms of their chemical purity, crystal radiopurity, scintillating performance and pulse-shape discrimination ability. An ICP-MS measurement exhibits a high purity of the CZC material (overall impurity level less than 10 g/g). The CZC crystals show a very low content of radionuclides from U/Th natural decay chains. For K and Cs only limits at the level few mBq/kg were set after more than 650 h of measurement with a high purity germanium (HPGe) detector. Nevertheless, they contained cosmogenic Cs with an activity of about 50 mBq/kg. The measurements with two CZC crystals (11 and 24 g) as scintillating detectors over 456.5 d in the low-background DAMA/CRYS facility, deep underground at LNGS, supported a substantial radiopurity of these crystals leading to a counting rate of 0.17 (kgkeVyr) at the of Zr (3.35 MeV). These detectors show a high particle-discrimination ability for and particles. Limits on the half-lives of the double beta decays (DBD) of Zr and of Zr with and without neutrinos emission were also set at the level – yr (90 C.L.). The detailed analyses of the internal background components will also be useful for further developments of CsZrCl low-background scintillating detectors and for the optimization of the experimental conditions.

Belli, P., Bernabei, R., Cappella, F., Caracciolo, V., Cerulli, R., Incicchitti, A., et al. (2023). Development of low-background Cs2ZrCl6 detectors to study rare decays in Zr isotopes. THE EUROPEAN PHYSICAL JOURNAL. A, HADRONS AND NUCLEI, 59 [10.1140/epja/s10050-023-01090-9].

Development of low-background Cs2ZrCl6 detectors to study rare decays in Zr isotopes

Bernabei R
;
Caracciolo V;Leoncini A;Merlo V;
2023-07-01

Abstract

In this work, we present the first complex study of CsZrCl (CZC) scintillating crystals in terms of their chemical purity, crystal radiopurity, scintillating performance and pulse-shape discrimination ability. An ICP-MS measurement exhibits a high purity of the CZC material (overall impurity level less than 10 g/g). The CZC crystals show a very low content of radionuclides from U/Th natural decay chains. For K and Cs only limits at the level few mBq/kg were set after more than 650 h of measurement with a high purity germanium (HPGe) detector. Nevertheless, they contained cosmogenic Cs with an activity of about 50 mBq/kg. The measurements with two CZC crystals (11 and 24 g) as scintillating detectors over 456.5 d in the low-background DAMA/CRYS facility, deep underground at LNGS, supported a substantial radiopurity of these crystals leading to a counting rate of 0.17 (kgkeVyr) at the of Zr (3.35 MeV). These detectors show a high particle-discrimination ability for and particles. Limits on the half-lives of the double beta decays (DBD) of Zr and of Zr with and without neutrinos emission were also set at the level – yr (90 C.L.). The detailed analyses of the internal background components will also be useful for further developments of CsZrCl low-background scintillating detectors and for the optimization of the experimental conditions.
lug-2023
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/04
English
Con Impact Factor ISI
CsZrCl (CZC) scintillating crystals; low background techniques
Belli, P., Bernabei, R., Cappella, F., Caracciolo, V., Cerulli, R., Incicchitti, A., et al. (2023). Development of low-background Cs2ZrCl6 detectors to study rare decays in Zr isotopes. THE EUROPEAN PHYSICAL JOURNAL. A, HADRONS AND NUCLEI, 59 [10.1140/epja/s10050-023-01090-9].
Belli, P; Bernabei, R; Cappella, F; Caracciolo, V; Cerulli, R; Incicchitti, A; Laubenstein, M; Leoncini, A; Merlo, V; Nagorny, Ss; Nahorna, Vv; Nisi, S; Wang, P
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/334583
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