| Autor: |
Belli, P., Bernabei, R., Cappella, F., Caracciolo, V., Cerulli, R., Incicchitti, A., Laubenstein, M., Leoncini, A., Merlo, V., Nagorny, S. S., Nahorna, V. V., Nisi, S., Wang, P. |
| Předmět: |
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| Zdroj: |
European Physical Journal A -- Hadrons & Nuclei; Jul2023, Vol. 59 Issue 7, p1-13, 13p |
| Abstrakt: |
In this work, we present the first complex study of Cs 2 ZrCl 6 (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 μ g/g). The CZC crystals show a very low content of radionuclides from U/Th natural decay chains. For 40 K and 137 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 134 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 - 0.11 + 0.13 (kg · keV · yr) - 1 at the Q 2 β of 96 Zr (3.35 MeV). These detectors show a high particle-discrimination ability for β (γ) and α particles. Limits on the half-lives of the double beta decays (DBD) of 96 Zr and of 94 Zr with and without neutrinos emission were also set at the level T 1 / 2 ∼ 10 17 – 10 20 yr (90 % C.L.). The detailed analyses of the internal background components will also be useful for further developments of Cs 2 ZrCl 6 low-background scintillating detectors and for the optimization of the experimental conditions. [ABSTRACT FROM AUTHOR] |
| Databáze: |
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