Assessment of Cs<sub>2</sub>HfCl<sub>6</sub> crystal applicability as low-temperature scintillating bolometers by their thermodynamic characteristics

Kuznetsov, S. V.; Nagorny, S.S.; Nahorna, V. V.; Pynenkov, A. A.; Nischev, K.N.; Попов, П. А.; Kandel, Ramjee; Wang, Pengli; Poda, D.V.; Dumoulin, L.; Giuliani, A.; Khalife, H.; Nones, C.; Olivieri, E.; Stenning, Gavin B. G.; Zolotarova, A.

doi:10.1039/d1tc06166f

Cited by 2 publications

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“…Despite the excellent performance of ZnWO 4 also as Transition Edge Sensor (TES)-carriers [39] developed and used in the R&D program of the CRESST experiment and its high radiopurity [40], there are no reported long-term low-background cryogenic measurements with a large volume ZnWO 4 crystal acting as a scintillating bolometer. However, excellent results with a 1 cm 3 ZnWO 4 scintillating bolometer have been recently achieved [41]. As it was shown with many other crystals [42], a simultaneous record of a scintillation pulse and a phonon signal allows for an effective particle identification leading to a significant background reduction.…”

Section: Jinst 18 P06026mentioning

confidence: 97%

ZnO-based scintillating bolometers: new prospects to study double beta decay of ⁶⁴Zn

Armatol

Dumoulin

et al. 2023

J. Inst.

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The first detailed study on the performance of a ZnO-based cryogenic scintillating bolometer as a detector to search for rare processes in zinc isotopes was carried out. A 7.2 g ZnO low-temperature detector, containing more than 80% of zinc in its mass, exhibits good energy resolution of baseline noise 1.0–2.7 keV FWHM at various working temperatures resulting in a low-energy threshold for the experiment, 2.0–6.0 keV. The light yield for β/γ events was measured as 1.5(3) keV/MeV, while it varies for α particles in the range of 0.2–3.0 keV/MeV. The detector demonstrates an effective identification of β/γ events from α events using time-properties of only heat signals. The radiopurity of the ZnO crystal was evaluated using the Inductively Coupled Plasma Mass Spectrometry, an ultra-low-background High Purity Ge γ-spectrometer, and bolometric measurements. Only limits were set at the level of 𝒪(1–100) mBq/kg on activities of 40K, 137Cs and daughter nuclides from the U/Th natural decay chains. The total internal α-activity was measured as 22(2) mBq/kg, with a major contribution caused by 6(1) mBq/kg of 232Th and 12(2) mBq/kg of 234U. Limits on double beta decay (DBD) processes in ^64Zn and 70Zn isotopes were set on the level of 𝒪(1017–1018) yr for various decay modes, profiting from 271 h of acquired background data in the above-ground lab. This study shows a good potential for ZnO-based scintillating bolometers to search for DBD processes of Zn isotopes, especially in 64Zn, with the most prominent spectral features at ∼ 10–20 keV, like the two-neutrino double electron capture. A 10 kg-scale experiment can reach the experimental sensitivity at the level of 𝒪(1024) yr.

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Section: Jinst 18 P06026mentioning

confidence: 97%

ZnO-based scintillating bolometers: new prospects to study double beta decay of ⁶⁴Zn

Armatol

Dumoulin

et al. 2023

J. Inst.

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“…The main scintillation properties of such crystals are listed in Table 4. In general, an other promising approach is also a crystal that can work as scintillating bolometers to study the decays to the ground state of daughter nuclei [49]. HP-Ge, instead, is a promising choice for the investigations of decay to excited levels of daughter nuclei thanks the excellent energy resolution.…”

Section: Perspectives and Conclusionmentioning

confidence: 99%

Investigation on Rare Nuclear Processes in Hf Nuclides

et al. 2022

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In this work, a review of recent studies concerning rare nuclear processes in Hf isotopes is presented. In particular, the investigations using HP-Ge spectrometry and Hf-based crystal scintillators are focused; the potentiality and the results of the “source = detector” approach are underlined. In addition, a short introduction concerning the impact of such kind of research in the context of astroparticle and nuclear physics is pointed out. In particular, the study of α decay and double beta decay of 174Hf, 176Hf, 177Hf, 178Hf, 179Hf, 180Hf isotopes either to the ground state or to the lower bounded levels have been discussed. The observation of α decay of 174Hf isotope to the ground state with a T1/2=7.0(1.2)×1016 y is reported and discussed. No decay was detected for α decay of 174Hf isotope at the first excited level of daughter and of 176Hf, 177Hf, 178Hf, 179Hf, 180Hf isotopes either to the ground state or to the lower bounded levels. The T1/2 lower limits for these decays are at the level of 1016–1020 y. Nevertheless, the T1/2 lower limits for the transitions of 176Hf→172Yb (0+→0+) and 177Hf→173Yb (7/2−→5/2−) are near to the theoretical predictions, giving hope to their observation in the near future. All the other experimental limits (∼1016–1020 y) are absolutely far from the theoretical expectations. The experiments investigating the 2ϵ and ϵβ+ processes in 174Hf are also reported; the obtained half-life limits are set at the level of 1016–1018 y. Moreover, we estimate the T1/2 of 2ν2ϵ of 174Hf decay at the level of (0.3–6) × 1021 y (at now the related measured lower limit is 7.1×1016 y).

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Assessment of Cs₂HfCl₆ crystal applicability as low-temperature scintillating bolometers by their thermodynamic characteristics

Abstract: The first studies of some thermodynamic properties in a wide temperature range (5-300) K of the Cs2HfCl6 (CHC) scintillating crystal has been performed. The CHC crystal exhibits a high thermal...

Cited by 2 publications

References 54 publications

ZnO-based scintillating bolometers: new prospects to study double beta decay of ⁶⁴Zn

ZnO-based scintillating bolometers: new prospects to study double beta decay of ⁶⁴Zn

Investigation on Rare Nuclear Processes in Hf Nuclides

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Assessment of Cs2HfCl6 crystal applicability as low-temperature scintillating bolometers by their thermodynamic characteristics

Abstract: The first studies of some thermodynamic properties in a wide temperature range (5-300) K of the Cs2HfCl6 (CHC) scintillating crystal has been performed. The CHC crystal exhibits a high thermal...

Cited by 2 publications

References 54 publications

ZnO-based scintillating bolometers: new prospects to study double beta decay of 64Zn

ZnO-based scintillating bolometers: new prospects to study double beta decay of 64Zn

Investigation on Rare Nuclear Processes in Hf Nuclides

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Assessment of Cs₂HfCl₆ crystal applicability as low-temperature scintillating bolometers by their thermodynamic characteristics

ZnO-based scintillating bolometers: new prospects to study double beta decay of ⁶⁴Zn

ZnO-based scintillating bolometers: new prospects to study double beta decay of ⁶⁴Zn