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1. Searching for beyond the Standard Model physics using the improved description of 100Mo $$2\nu \beta \beta $$ 2 ν β β decay spectral shape with CUPID-Mo

Author

C. Augier, A. S. Barabash, F. Bellini, G. Benato, M. Beretta, L. Bergé, J. Billard, Yu. A. Borovlev, L. Cardani, N. Casali, A. Cazes, E. Celi, M. Chapellier, D. Chiesa, I. Dafinei, F. A. Danevich, M. De Jesus, T. Dixon, L. Dumoulin, K. Eitel, F. Ferri, B. K. Fujikawa, J. Gascon, L. Gironi, A. Giuliani, V. D. Grigorieva, M. Gros, D. L. Helis, H. Z. Huang, R. Huang, L. Imbert, A. Juillard, H. Khalife, M. Kleifges, V. V. Kobychev, Yu. G. Kolomensky, S. I. Konovalov, J. Kotila, P. Loaiza, L. Ma, E. P. Makarov, P. de Marcillac, R. Mariam, L. Marini, S. Marnieros, X. F. Navick, C. Nones, E. B. Norman, E. Olivieri, J. L. Ouellet, L. Pagnanini, L. Pattavina, B. Paul, M. Pavan, H. Peng, G. Pessina, S. Pirro, D. V. Poda, O. G. Polischuk, S. Pozzi, E. Previtali, Th. Redon, A. Rojas, S. Rozov, V. Sanglard, J. A. Scarpaci, B. Schmidt, Y. Shen, V. N. Shlegel, F. Šimkovic, V. Singh, C. Tomei, V. I. Tretyak, V. I. Umatov, L. Vagneron, M. Velázquez, B. Ware, B. Welliver, L. Winslow, M. Xue, E. Yakushev, M. Zarytskyy, and A. S. Zolotarova

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract The current experiments searching for neutrinoless double- $$\beta $$ β ( $$0\nu \beta \beta $$ 0 ν β β ) decay also collect large statistics of Standard Model allowed two-neutrino double- $$\beta $$ β ( $$2\nu \beta \beta $$ 2 ν β β ) decay events. These can be used to search for Beyond Standard Model (BSM) physics via $$2\nu \beta \beta $$ 2 ν β β decay spectral distortions. 100Mo has a natural advantage due to its relatively short half-life, allowing higher $$2\nu \beta \beta $$ 2 ν β β decay statistics at equal exposures compared to the other isotopes. We demonstrate the potential of the dual read-out bolometric technique exploiting a 100Mo exposure of 1.47 kg $$\times $$ × years, acquired in the CUPID-Mo experiment at the Modane underground laboratory (France). We set limits on $$0\nu \beta \beta $$ 0 ν β β decays with the emission of one or more Majorons, on $$2\nu \beta \beta $$ 2 ν β β decay with Lorentz violation, and $$2\nu \beta \beta $$ 2 ν β β decay with a sterile neutrino emission. In this analysis, we investigate the systematic uncertainty induced by modeling the $$2\nu \beta \beta $$ 2 ν β β decay spectral shape parameterized through an improved model, an effect never considered before. This work motivates searches for BSM processes in the upcoming CUPID experiment, which will collect the largest amount of $$2\nu \beta \beta $$ 2 ν β β decay events among the next-generation experiments.

Published
2024
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2. Radioassay of the materials for AMoRE-II experiment

Author

A. Agrawal, V. V. Alenkov, P. Aryal, H. Bae, J. Beyer, B. Bhandari, R. S. Boiko, K. Boonin, O. Buzanov, C. R. Byeon, N. Chanthima, M. K. Cheoun, J. S. Choe, S. Choi, S. Choudhury, J. S. Chung, F. A. Danevich, M. Djamal, D. Drung, C. Enss, A. Fleischmann, A. M. Gangapshev, L. Gastaldo, Y. M. Gavrilyuk, A. M. Gezhaev, O. Gileva, V. D. Grigorieva, V. I. Gurentsov, C. Ha, D. H. Ha, E. J. Ha, D. H. Hwang, E. J. Jeon, J. A. Jeon, H. S. Jo, J. Kaewkhao, C. S. Kang, W. G. Kang, V. V. Kazalov, S. Kempf, A. Khan, S. Khan, D. Y. Kim, G. W. Kim, H. B. Kim, H. J. Kim, H. L. Kim, H. S. Kim, M. B. Kim, S. C. Kim, S. K. Kim, S. R. Kim, W. T. Kim, Y. D. Kim, Y. H. Kim, K. Kirdsiri, Y. J. Ko, V. V. Kobychev, V. Kornoukhov, V. V. Kuzminov, D. H. Kwon, C. H. Lee, D. Y. Lee, E. K. Lee, H. J. Lee, H. S. Lee, J. Lee, J. Y. Lee, K. B. Lee, M. H. Lee, M. K. Lee, S. W. Lee, Y. C. Lee, D. S. Leonard, H. S. Lim, B. Mailyan, E. P. Makarov, P. Nyanda, Y. Oh, S. L. Olsen, S. I. Panasenko, H. K. Park, H. S. Park, K. S. Park, S. Y. Park, O. G. Polischuk, H. Prihtiadi, S. Ra, S. S. Ratkevich, G. Rooh, M. B. Sari, J. Seo, K. M. Seo, B. Sharma, K. A. Shin, V. N. Shlegel, K. Siyeon, J. So, N. V. Sokur, J. K. Son, J. W. Song, N. Srisittipokakun, V. I. Tretyak, R. Wirawan, K. R. Woo, H. J. Yeon, Y. S. Yoon, and Q. Yue

Subjects
double beta decay, radiopurity, radioassay, ICP-MS, HPGe, Physics, QC1-999
Abstract

The AMoRE-II experiment will search for the 0νββ decay of 100Mo nuclei using molybdate crystal scintillators, operating at milli-Kelvin (mK) temperatures, with a total of 80 kg of 100Mo. The background goal for the experiment is 10–4 counts/keV/kg/year in the region of interest around the 0νββ decay Q-value of 3,034 keV. To achieve this level, the rate of background signals arising from emissions produced by decays of radioactive impurities in the detector and shielding materials must be strictly controlled. To do this, concentrations of such impurities are measured and are controlled through materials selection and purification. In this paper, we describe the design and the construction materials used to build the AMoRE-II detector and shielding system, including active and passive shielding, the cryostat, and the detector holders and instrumentation, and we report on measurements of radioactive impurities within candidate and selected materials.

Published
2024
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3. The background model of the CUPID-Mo $$0\nu \beta \beta $$ 0 ν β β experiment

Author

C. Augier, A. S. Barabash, F. Bellini, G. Benato, M. Beretta, L. Bergé, J. Billard, Yu. A. Borovlev, L. Cardani, N. Casali, A. Cazes, E. Celi, M. Chapellier, D. Chiesa, I. Dafinei, F. A. Danevich, M. De Jesus, P. de Marcillac, T. Dixon, L. Dumoulin, K. Eitel, F. Ferri, B. K. Fujikawa, J. Gascon, L. Gironi, A. Giuliani, V. D. Grigorieva, M. Gros, D. L. Helis, H. Z. Huang, R. Huang, L. Imbert, J. Johnston, A. Juillard, H. Khalife, M. Kleifges, V. V. Kobychev, Yu. G. Kolomensky, S. I. Konovalov, J. Kotila, P. Loaiza, L. Ma, E. P. Makarov, R. Mariam, L. Marini, S. Marnieros, X.-F. Navick, C. Nones, E. B. Norman, E. Olivieri, J. L. Ouellet, L. Pagnanini, L. Pattavina, B. Paul, M. Pavan, H. Peng, G. Pessina, S. Pirro, D. V. Poda, O. G. Polischuk, S. Pozzi, E. Previtali, Th. Redon, A. Rojas, S. Rozov, V. Sanglard, J. A. Scarpaci, B. Schmidt, Y. Shen, V. N. Shlegel, V. Singh, C. Tomei, V. I. Tretyak, V. I. Umatov, L. Vagneron, M. Velázquez, B. Welliver, L. Winslow, M. Xue, E. Yakushev, M. Zarytskyy, and A. S. Zolotarova

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract CUPID-Mo, located in the Laboratoire Souterrain de Modane (France), was a demonstrator for the next generation $$0\nu \beta \beta $$ 0 ν β β decay experiment, CUPID. It consisted of an array of 20 enriched Li $$_{2}$$ 2 $$^{100}$$ 100 MoO $$_4$$ 4 bolometers and 20 Ge light detectors and has demonstrated that the technology of scintillating bolometers with particle identification capabilities is mature. Furthermore, CUPID-Mo can inform and validate the background prediction for CUPID. In this paper, we present a detailed model of the CUPID-Mo backgrounds. This model is able to describe well the features of the experimental data and enables studies of the $$2\nu \beta \beta $$ 2 ν β β decay and other processes with high precision. We also measure the radio-purity of the Li $$_{2}$$ 2 $$^{100}$$ 100 MoO $$_4$$ 4 crystals which are found to be sufficient for the CUPID goals. Finally, we also obtain a background index in the region of interest of 3.7 $$^{+0.9}_{-0.8}$$ - 0.8 + 0.9 (stat) $$^{+1.5}_{-0.7}$$ - 0.7 + 1.5 (syst) $$\times ~10 ^{-3}$$ × 10 - 3 counts/ $$\Delta E_{\text {FWHM}}/\text {mol}_{\text {iso}}/\text {year},$$ Δ E FWHM / mol iso / year , the lowest in a bolometric $$0\nu \beta \beta $$ 0 ν β β decay experiment.

Published
2023
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4. Final results on the $$0\nu \beta \beta $$ 0 ν β β decay half-life limit of $$^{100}$$ 100 Mo from the CUPID-Mo experiment

Author

C. Augier, A. S. Barabash, F. Bellini, G. Benato, M. Beretta, L. Bergé, J. Billard, Yu. A. Borovlev, L. Cardani, N. Casali, A. Cazes, M. Chapellier, D. Chiesa, I. Dafinei, F. A. Danevich, M. De Jesus, P. de Marcillac, T. Dixon, L. Dumoulin, K. Eitel, F. Ferri, B. K. Fujikawa, J. Gascon, L. Gironi, A. Giuliani, V. D. Grigorieva, M. Gros, D. L. Helis, H. Z. Huang, R. Huang, L. Imbert, J. Johnston, A. Juillard, H. Khalife, M. Kleifges, V. V. Kobychev, Yu. G. Kolomensky, S. I. Konovalov, P. Loaiza, L. Ma, E. P. Makarov, R. Mariam, L. Marini, S. Marnieros, X.-F. Navick, C. Nones, E. B. Norman, E. Olivieri, J. L. Ouellet, L. Pagnanini, L. Pattavina, B. Paul, M. Pavan, H. Peng, G. Pessina, S. Pirro, D. V. Poda, O. G. Polischuk, S. Pozzi, E. Previtali, Th. Redon, A. Rojas, S. Rozov, V. Sanglard, J. A. Scarpaci, B. Schmidt, Y. Shen, V. N. Shlegel, V. Singh, C. Tomei, V. I. Tretyak, V. I. Umatov, L. Vagneron, M. Velázquez, B. Welliver, L. Winslow, M. Xue, E. Yakushev, M. Zarytskyy, and A. S. Zolotarova

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract The CUPID-Mo experiment to search for 0 $$\nu \beta \beta $$ ν β β decay in $$^{100}$$ 100 Mo has been recently completed after about 1.5 years of operation at Laboratoire Souterrain de Modane (France). It served as a demonstrator for CUPID, a next generation 0 $$\nu \beta \beta $$ ν β β decay experiment. CUPID-Mo was comprised of 20 enriched $$\hbox {Li}_{{2}}$$ Li 2 $$^{100}$$ 100 $$\hbox {MoO}_4$$ MoO 4 scintillating calorimeters, each with a mass of $$\sim 0.2$$ ∼ 0.2 kg, operated at $$\sim 20$$ ∼ 20 mK. We present here the final analysis with the full exposure of CUPID-Mo ( $$^{100}$$ 100 Mo exposure of 1.47 $$\hbox {kg} \times \hbox {year}$$ kg × year ) used to search for lepton number violation via 0 $$\nu \beta \beta $$ ν β β decay. We report on various analysis improvements since the previous result on a subset of data, reprocessing all data with these new techniques. We observe zero events in the region of interest and set a new limit on the $$^{100}$$ 100 Mo 0 $$\nu \beta \beta $$ ν β β decay half-life of $$T_{1/2}^{0\nu }$$ T 1 / 2 0 ν $$> {1.8}\times 10^{24}$$ > 1.8 × 10 24 year (stat. + syst.) at 90% CI. Under the light Majorana neutrino exchange mechanism this corresponds to an effective Majorana neutrino mass of $$\left$$ m β β $$

Published
2022
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5. Precise measurement of $$2\nu \beta \beta $$ 2νββ decay of $$^{100}$$ 100 Mo with the CUPID-Mo detection technology

Author

E. Armengaud, C. Augier, A. S. Barabash, F. Bellini, G. Benato, A. Benoît, M. Beretta, L. Bergé, J. Billard, Yu. A. Borovlev, Ch. Bourgeois, M. Briere, V. Brudanin, P. Camus, L. Cardani, N. Casali, A. Cazes, M. Chapellier, F. Charlieux, M. de Combarieu, I. Dafinei, F. A. Danevich, M. De Jesus, L. Dumoulin, K. Eitel, E. Elkhoury, F. Ferri, B. K. Fujikawa, J. Gascon, L. Gironi, A. Giuliani, V. D. Grigorieva, M. Gros, E. Guerard, D. L. Helis, H. Z. Huang, R. Huang, J. Johnston, A. Juillard, H. Khalife, M. Kleifges, V. V. Kobychev, Yu. G. Kolomensky, S. I. Konovalov, A. Leder, J. Kotila, P. Loaiza, L. Ma, E. P. Makarov, P. de Marcillac, L. Marini, S. Marnieros, D. Misiak, X.-F. Navick, C. Nones, V. Novati, E. Olivieri, J. L. Ouellet, L. Pagnanini, P. Pari, L. Pattavina, B. Paul, M. Pavan, H. Peng, G. Pessina, S. Pirro, D. V. Poda, O. G. Polischuk, E. Previtali, Th. Redon, S. Rozov, C. Rusconi, V. Sanglard, K. Schäffner, B. Schmidt, Y. Shen, V. N. Shlegel, B. Siebenborn, V. Singh, C. Tomei, V. I. Tretyak, V. I. Umatov, L. Vagneron, M. Velázquez, M. Weber, B. Welliver, L. Winslow, M. Xue, E. Yakushev, and A. S. Zolotarova

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract We report the measurement of the two-neutrino double-beta ($$2\nu \beta \beta $$ 2νββ ) decay of $$^{100}$$ 100 Mo to the ground state of $$^{100}$$ 100 Ru using lithium molybdate ($$\hbox {Li}_2^{\;\;100}\hbox {MoO}_4$$ Li2100MoO4 ) scintillating bolometers. The detectors were developed for the CUPID-Mo program and operated at the EDELWEISS-III low background facility in the Modane underground laboratory (France). From a total exposure of 42.235 kg$$\times $$ × day, the half-life of $$^{100}$$ 100 Mo is determined to be $$T_{1/2}^{2\nu }=[7.12^{+0.18}_{-0.14}\,\mathrm {(stat.)}\pm 0.10\,\mathrm {(syst.)}]\times 10^{18}$$ T1/22ν=[7.12-0.14+0.18(stat.)±0.10(syst.)]×1018 years. This is the most accurate determination of the $$2\nu \beta \beta $$ 2νββ half-life of $$^{100}$$ 100 Mo to date.

Published
2020
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6. The CUPID-Mo experiment for neutrinoless double-beta decay: performance and prospects

Author

E. Armengaud, C. Augier, A. S. Barabash, F. Bellini, G. Benato, A. Benoît, M. Beretta, L. Bergé, J. Billard, Yu. A. Borovlev, Ch. Bourgeois, M. Briere, V. B. Brudanin, P. Camus, L. Cardani, N. Casali, A. Cazes, M. Chapellier, F. Charlieux, M. de Combarieu, I. Dafinei, F. A. Danevich, M. De Jesus, L. Dumoulin, K. Eitel, E. Elkhoury, F. Ferri, B. K. Fujikawa, J. Gascon, L. Gironi, A. Giuliani, V. D. Grigorieva, M. Gros, E. Guerard, D. L. Helis, H. Z. Huang, R. Huang, J. Johnston, A. Juillard, H. Khalife, M. Kleifges, V. V. Kobychev, Yu. G. Kolomensky, S. I. Konovalov, A. Leder, P. Loaiza, L. Ma, E. P. Makarov, P. de Marcillac, L. Marini, S. Marnieros, D. Misiak, X. -F. Navick, C. Nones, V. Novati, E. Olivieri, J. L. Ouellet, L. Pagnanini, P. Pari, L. Pattavina, B. Paul, M. Pavan, H. Peng, G. Pessina, S. Pirro, D. V. Poda, O. G. Polischuk, E. Previtali, Th. Redon, S. Rozov, C. Rusconi, V. Sanglard, K. Schäffner, B. Schmidt, Y. Shen, V. N. Shlegel, B. Siebenborn, V. Singh, S. Sorbino, C. Tomei, V. I. Tretyak, V. I. Umatov, L. Vagneron, M. Velázquez, M. Weber, B. Welliver, L. Winslow, M. Xue, E. Yakushev, and A. S. Zolotarova

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract CUPID-Mo is a bolometric experiment to search for neutrinoless double-beta decay ($$0\nu \beta \beta $$ 0νββ ) of $$^{100}\hbox {Mo}$$ 100Mo . In this article, we detail the CUPID-Mo detector concept, assembly and installation in the Modane underground laboratory, providing results from the first datasets. The CUPID-Mo detector consists of an array of 20 $$^{100}\hbox {Mo}$$ 100Mo -enriched 0.2 kg $$\hbox {Li}_2\hbox {MoO}_4$$ Li2MoO4 crystals operated as scintillating bolometers at $$\sim 20\hbox { mK}$$ ∼20mK . The $$\hbox {Li}_2\hbox {MoO}_4$$ Li2MoO4 crystals are complemented by 20 thin Ge optical bolometers to reject $$\alpha $$ α events by the simultaneous detection of heat and scintillation light. We observe a good detector uniformity and an excellent energy resolution of 5.3 keV (6.5 keV) FWHM at 2615 keV, in calibration (physics) data. Light collection ensures the rejection of $$\alpha $$ α particles at a level much higher than 99.9% – with equally high acceptance for $$\gamma $$ γ /$$\beta $$ β events – in the region of interest for $$^{100}\hbox {Mo}$$ 100Mo $$0\nu \beta \beta $$ 0νββ . We present limits on the crystals’ radiopurity: $$\le 3~\mu \hbox {Bq/kg}$$ ≤3μBq/kg of $$^{226}\hbox {Ra}$$ 226Ra and $$\le 2~\mu \hbox {Bq/kg}$$ ≤2μBq/kg of $$^{232}\hbox {Th}$$ 232Th . We discuss the science reach of CUPID-Mo, which can set the most stringent half-life limit on the $$^{100}\hbox {Mo}$$ 100Mo $$0\nu \beta \beta $$ 0νββ decay in half-a-year’s livetime. The achieved results show that CUPID-Mo is a successful demonstrator of the technology developed by the LUMINEU project and subsequently selected for the CUPID experiment, a proposed follow-up of CUORE, the currently running first tonne-scale bolometric $$0\nu \beta \beta $$ 0νββ experiment.

Published
2020
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7. The $$\hbox {Na}_2\hbox {W}_2\hbox {O}_7$$ Na2W2O7 crystal: a crystal scintillator for dark matter search experiment

Author

Indra Raj Pandey, H. J. Kim, H. S. Lee, Y. D. Kim, M. H. Lee, V. D. Grigorieva, and V. N. Shlegel

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract A single crystal of $$\hbox {Na}_2\hbox {W}_2\hbox {O}_7$$ Na2W2O7 (NWO) was grown by a low-thermal-gradient Czochralski technique (LTG-CZ). The scintillation properties of the crystal were evaluated for the first time as a potential material for dark matter search experiments. The luminescence and scintillation characteristics of the crystal were studied at room temperature and low temperatures by using a light-emitting diode (LED) and a $${}^{90}\hbox {Sr}$$ 90Sr beta source. The luminescence and scintillation light yield at 10 K were significantly higher than those at room temperature. The crystal showed higher light yield at 10 K than a CaMoO$$_4$$ 4 (CMO) crystal. The decay time of the crystal was investigated at temperatures between 10 and 300 K. The sensitivity to spin-independent weakly interacting massive particle-nucleon interactions based on 10 kg (2 months) and 50 kg (12 months) data for the NWO crystal detectors was estimated by a simulated experiment using the standard halo model. The luminescence, scintillation, and sensitivity results revealed that the NWO crystal is a promising candidate for a dark matter search experiment in the near future.

Published
2018
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8. Development of $$^{100}\hbox {Mo}$$ 100 Mo -containing scintillating bolometers for a high-sensitivity neutrinoless double-beta decay search

Author

E. Armengaud, C. Augier, A. S. Barabash, J. W. Beeman, T. B. Bekker, F. Bellini, A. Benoît, L. Bergé, T. Bergmann, J. Billard, R. S. Boiko, A. Broniatowski, V. Brudanin, P. Camus, S. Capelli, L. Cardani, N. Casali, A. Cazes, M. Chapellier, F. Charlieux, D. M. Chernyak, M. de Combarieu, N. Coron, F. A. Danevich, I. Dafinei, M. De Jesus, L. Devoyon, S. Di Domizio, L. Dumoulin, K. Eitel, C. Enss, F. Ferroni, A. Fleischmann, N. Foerster, J. Gascon, L. Gastaldo, L. Gironi, A. Giuliani, V. D. Grigorieva, M. Gros, L. Hehn, S. Hervé, V. Humbert, N. V. Ivannikova, I. M. Ivanov, Y. Jin, A. Juillard, M. Kleifges, V. V. Kobychev, S. I. Konovalov, F. Koskas, V. Kozlov, H. Kraus, V. A. Kudryavtsev, M. Laubenstein, H. Le Sueur, M. Loidl, P. Magnier, E. P. Makarov, M. Mancuso, P. de Marcillac, S. Marnieros, C. Marrache-Kikuchi, S. Nagorny, X-F. Navick, M. O. Nikolaichuk, C. Nones, V. Novati, E. Olivieri, L. Pagnanini, P. Pari, L. Pattavina, M. Pavan, B. Paul, Y. Penichot, G. Pessina, G. Piperno, S. Pirro, O. Plantevin, D. V. Poda, E. Queguiner, T. Redon, M. Rodrigues, S. Rozov, C. Rusconi, V. Sanglard, K. Schäffner, S. Scorza, V. N. Shlegel, B. Siebenborn, O. Strazzer, D. Tcherniakhovski, C. Tomei, V. I. Tretyak, V. I. Umatov, L. Vagneron, Ya. V. Vasiliev, M. Velázquez, M. Vignati, M. Weber, E. Yakushev, and A. S. Zolotarova

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract This paper reports on the development of a technology involving $$^{100}\hbox {Mo}$$ 100 Mo -enriched scintillating bolometers, compatible with the goals of CUPID, a proposed next-generation bolometric experiment to search for neutrinoless double-beta decay. Large mass ( $$\sim 1~\hbox {kg}$$ ∼ 1 kg ), high optical quality, radiopure $$^{100}\hbox {Mo}$$ 100 Mo -containing zinc and lithium molybdate crystals have been produced and used to develop high performance single detector modules based on 0.2–0.4 kg scintillating bolometers. In particular, the energy resolution of the lithium molybdate detectors near the Q-value of the double-beta transition of $$^{100}\hbox {Mo}$$ 100 Mo (3034 keV) is 4–6 keV FWHM. The rejection of the $$\alpha $$ α -induced dominant background above 2.6 MeV is better than $$8\sigma $$ 8 σ . Less than $$10~\upmu \hbox {Bq/kg}$$ 10 μ Bq/kg activity of $$^{232}\hbox {Th}\, (^{228}\hbox {Th})$$ 232 Th ( 228 Th ) and $$^{226}\hbox {Ra}$$ 226 Ra in the crystals is ensured by boule recrystallization. The potential of $$^{100}\hbox {Mo}$$ 100 Mo -enriched scintillating bolometers to perform high sensitivity double-beta decay searches has been demonstrated with only $$10~\hbox {kg}\times \hbox {d}$$ 10 kg × d exposure: the two neutrino double-beta decay half-life of $$^{100}\hbox {Mo}$$ 100 Mo has been measured with the up-to-date highest accuracy as $$T_{1/2}$$ T 1 / 2 = [6.90 ± 0.15(stat.) ± 0.37(syst.)] $$\times ~10^{18}~\hbox {years}$$ × 10 18 years . Both crystallization and detector technologies favor lithium molybdate, which has been selected for the ongoing construction of the CUPID-0/Mo demonstrator, containing several kg of $$^{100}\hbox {Mo}$$ 100 Mo .

Published
2017
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9. Final results on the $$0\nu \beta \beta $$ decay half-life limit of $$^{100}$$Mo from the CUPID-Mo experiment

Author

C. Augier, A. S. Barabash, F. Bellini, G. Benato, M. Beretta, L. Bergé, J. Billard, Yu. A. Borovlev, L. Cardani, N. Casali, A. Cazes, M. Chapellier, D. Chiesa, I. Dafinei, F. A. Danevich, M. De Jesus, P. de Marcillac, T. Dixon, L. Dumoulin, K. Eitel, F. Ferri, B. K. Fujikawa, J. Gascon, L. Gironi, A. Giuliani, V. D. Grigorieva, M. Gros, D. L. Helis, H. Z. Huang, R. Huang, L. Imbert, J. Johnston, A. Juillard, H. Khalife, M. Kleifges, V. V. Kobychev, Yu. G. Kolomensky, S. I. Konovalov, P. Loaiza, L. Ma, E. P. Makarov, R. Mariam, L. Marini, S. Marnieros, X.-F. Navick, C. Nones, E. B. Norman, E. Olivieri, J. L. Ouellet, L. Pagnanini, L. Pattavina, B. Paul, M. Pavan, H. Peng, G. Pessina, S. Pirro, D. V. Poda, O. G. Polischuk, S. Pozzi, E. Previtali, Th. Redon, A. Rojas, S. Rozov, V. Sanglard, J. A. Scarpaci, B. Schmidt, Y. Shen, V. N. Shlegel, V. Singh, C. Tomei, V. I. Tretyak, V. I. Umatov, L. Vagneron, M. Velázquez, B. Welliver, L. Winslow, M. Xue, E. Yakushev, M. Zarytskyy, A. S. Zolotarova, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire Souterrain de Modane (LSM - UMR 6417), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Science et Ingénierie des Matériaux et Procédés (SIMaP), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Augier, C, Barabash, A, Bellini, F, Benato, G, Beretta, M, Berge, L, Billard, J, Borovlev, Y, Cardani, L, Casali, N, Cazes, A, Chapellier, M, Chiesa, D, Dafinei, I, Danevich, F, De Jesus, M, de Marcillac, P, Dixon, T, Dumoulin, L, Eitel, K, Ferri, F, Fujikawa, B, Gascon, J, Gironi, L, Giuliani, A, Grigorieva, V, Gros, M, Helis, D, Huang, H, Huang, R, Imbert, L, Johnston, J, Juillard, A, Khalife, H, Kleifges, M, Kobychev, V, Kolomensky, Y, Konovalov, S, Loaiza, P, Ma, L, Makarov, E, Mariam, R, Marini, L, Marnieros, S, Navick, X, Nones, C, Norman, E, Olivieri, E, Ouellet, J, Pagnanini, L, Pattavina, L, Paul, B, Pavan, M, Peng, H, Pessina, G, Pirro, S, Poda, D, Polischuk, O, Pozzi, S, Previtali, E, Redon, T, Rojas, A, Rozov, S, Sanglard, V, Scarpaci, J, Schmidt, B, Shen, Y, Shlegel, V, Singh, V, Tomei, C, Tretyak, V, Umatov, V, Vagneron, L, Velazquez, M, Welliver, B, Winslow, L, Xue, M, Yakushev, E, Zarytskyy, M, and Zolotarova, A

Subjects
radiopurity, Physics - Instrumentation and Detectors, Physics and Astronomy (miscellaneous), Double-beta decay, energy spectrum, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], angular momentum, thermal, X-ray, cryogenic detector, enriched materials, muon, cryogenic detectors, calorimeter, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], scintillating calorimeter, scintillator, 100Mo, Lithium molybdate, high performance, particle identification, low background, dimension: 2, 100 Mo, Majorana neutrino, Engineering (miscellaneous), lepton number: violation, Nuclear Experiment, scintillation counter, background, neutrino: Majorana: mass, nucleus, temperature, neutrino: exchange, lithium, gamma ray, efficiency, neutrino: Majorana, numerical calculations: Monte Carlo, double beta decay, neutrino
Abstract

The CUPID-Mo experiment to search for 0$$\nu \beta \beta $$ ν β β decay in $$^{100}$$ 100 Mo has been recently completed after about 1.5 years of operation at Laboratoire Souterrain de Modane (France). It served as a demonstrator for CUPID, a next generation 0$$\nu \beta \beta $$ ν β β decay experiment. CUPID-Mo was comprised of 20 enriched $$\hbox {Li}_{{2}}$$ Li 2 $$^{100}$$ 100 $$\hbox {MoO}_4$$ MoO 4 scintillating calorimeters, each with a mass of $$\sim 0.2$$ ∼ 0.2 kg, operated at $$\sim 20$$ ∼ 20 mK. We present here the final analysis with the full exposure of CUPID-Mo ($$^{100}$$ 100 Mo exposure of 1.47 $$\hbox {kg} \times \hbox {year}$$ kg × year ) used to search for lepton number violation via 0$$\nu \beta \beta $$ ν β β decay. We report on various analysis improvements since the previous result on a subset of data, reprocessing all data with these new techniques. We observe zero events in the region of interest and set a new limit on the $$^{100}$$ 100 Mo 0$$\nu \beta \beta $$ ν β β decay half-life of $$T_{1/2}^{0\nu }$$ T 1 / 2 0 ν $$> {1.8}\times 10^{24}$$ > 1.8 × 10 24 year (stat. + syst.) at 90% CI. Under the light Majorana neutrino exchange mechanism this corresponds to an effective Majorana neutrino mass of $$\left$$ m β β $$ < ( 0.28 - 0.49 ) eV, dependent upon the nuclear matrix element utilized.

Published
2022

10. Precise measurement of $2\nu\beta\beta$ decay of $^{100}$Mo with the CUPID-Mo detection technology

Author

Matthias Kleifges, S. Marnieros, A. S. Barabash, J. Kotila, Ezio Previtali, E. Guerard, B. Welliver, Lindley Winslow, P. de Marcillac, Claudia Tomei, A. S. Zolotarova, L. Marini, R. G. Huang, O. G. Polischuk, D. Misiak, Th. Redon, J. Billard, L. Cardani, Stefano Pirro, Federico Ferri, Yao Shen, J. Johnston, M. Pavan, P. Camus, V. Novati, B. K. Fujikawa, M. de Combarieu, L. Pattavina, Alain Benoit, B. Siebenborn, Yu. A. Borovlev, F. Charlieux, H. Z. Huang, S. V. Rozov, B. Paul, E. Armengaud, E. P. Makarov, L. Ma, Vasundhara Singh, F.A. Danevich, M. Briere, P. Loaiza, B. Schmidt, E. Elkhoury, M. De Jesus, A. Giuliani, V. I. Umatov, D. L. Helis, S. I. Konovalov, C. Rusconi, M. Gros, C. Nones, L. Dumoulin, V.N. Shlegel, K. Eitel, H. Khalife, Marc Weber, X. F. Navick, Francesca Bellini, G. Pessina, A. Leder, D.V. Poda, V.I. Tretyak, M. Beretta, P. Pari, L. Pagnanini, Yu G. Kolomensky, Ioan Dafinei, Jonathan Ouellet, C. Augier, Giovanni Benato, K. Schäffner, V. Sanglard, A. Juillard, Matias Velázquez, V. V. Kobychev, L. Vagneron, L. Bergé, E. Yakushev, L. Gironi, E. Olivieri, J. Gascon, A. Cazes, Ch. Bourgeois, V.B. Brudanin, M. Chapellier, N. Casali, M. Xue, V. D. Grigorieva, Haiping Peng, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Néel (NEEL), Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Institut Rayonnement Matière de Saclay (IRAMIS), Science et Ingénierie des Matériaux et Procédés (SIMaP), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Armengaud, E, Augier, C, Barabash, A, Bellini, F, Benato, G, Benoit, A, Beretta, M, Berge, L, Billard, J, Borovlev, Y, Bourgeois, C, Briere, M, Brudanin, V, Camus, P, Cardani, L, Casali, N, Cazes, A, Chapellier, M, Charlieux, F, de Combarieu, M, Dafinei, I, Danevich, F, De Jesus, M, Dumoulin, L, Eitel, K, Elkhoury, E, Ferri, F, Fujikawa, B, Gascon, J, Gironi, L, Giuliani, A, Grigorieva, V, Gros, M, Guerard, E, Helis, D, Huang, H, Huang, R, Johnston, J, Juillard, A, Khalife, H, Kleifges, M, Kobychev, V, Kolomensky, Y, Konovalov, S, Leder, A, Kotila, J, Loaiza, P, Ma, L, Makarov, E, de Marcillac, P, Marini, L, Marnieros, S, Misiak, D, Navick, X, Nones, C, Novati, V, Olivieri, E, Ouellet, J, Pagnanini, L, Pari, P, Pattavina, L, Paul, B, Pavan, M, Peng, H, Pessina, G, Pirro, S, Poda, D, Polischuk, O, Previtali, E, Redon, T, Rozov, S, Rusconi, C, Sanglard, V, Schaffner, K, Schmidt, B, Shen, Y, Shlegel, V, Siebenborn, B, Singh, V, Tomei, C, Tretyak, V, Umatov, V, Vagneron, L, Velazquez, M, Weber, M, Welliver, B, Winslow, L, Xue, M, Yakushev, E, Zolotarova, A, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National Polytechnique de Grenoble (INPG)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Hélium : du fondamental aux applications (NEEL - HELFA), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), and Cryogénie (NEEL - Cryo)

Subjects
Lithium molybdate, Physics - Instrumentation and Detectors, Physics and Astronomy (miscellaneous), Analytical chemistry, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, 01 natural sciences, Atomic, chemistry.chemical_compound, Particle and Plasma Physics, two-neutrino double-beta decay, scintillating bolometers, 0103 physical sciences, ddc:530, Beta (velocity), Nuclear, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Nuclear Experiment, Engineering (miscellaneous), physics.ins-det, S076H2N, Physics, Quantum Physics, 010308 nuclear & particles physics, Molecular, Beta decay, Nuclear & Particles Physics, 3. Good health, chemistry, double beta decays, bolometers, Underground laboratory, Ground state
Abstract

We report the measurement of the two-neutrino double-beta ($2\nu\beta\beta$) decay of $^{100}$Mo to the ground state of $^{100}$Ru using lithium molybdate (\crystal) scintillating bolometers. The detectors were developed for the CUPID-Mo program and operated at the EDELWEISS-III low background facility in the Modane underground laboratory. From a total exposure of $42.235$ kg$\times$d, the half-life of $^{100}$Mo is determined to be $T_{1/2}^{2\nu}=[7.12^{+0.18}_{-0.14}\,\mathrm{(stat.)}\pm0.10\,\mathrm{(syst.)}]\times10^{18}$ years. This is the most accurate determination of the $2\nu\beta\beta$ half-life of $^{100}$Mo to date. We also confirm, with the statistical significance of $>3\sigma$, that the single-state dominance model of the $2\nu\beta\beta$ decay of $^{100}$Mo is favored over the high-state dominance model., Comment: 11 pages, 6 figures, 4 tables

Published
2020

11. First data from the CUPID-Mo neutrinoless double beta decay experiment

Author

K. Schäffner, N. Casali, Matthias Kleifges, M. De Jesus, S. Marnieros, S. V. Rozov, Alexandre Benoit, V. Singh, J. Gascon, Haiping Peng, P. Camus, Federico Ferri, R. G. Huang, C. Rusconi, M. de Combarieu, C. Augier, M. Gros, A. Cazes, P. Pari, L. Pagnanini, Yu G. Kolomensky, L. Dumoulin, A. S. Barabash, E. Olivieri, V. Sanglard, V. Novati, Marc Weber, A. Juillard, B. Paul, Matias Velázquez, V. V. Kobychev, L. Vagneron, Ezio Previtali, L. Bergé, O. G. Polischuk, M. Xue, B. K. Fujikawa, X.-F. Navick, K. Eitel, H. Khalife, V.N. Shlegel, B. Welliver, D. L. Helis, F. Charlieux, H. Z. Huang, D. Misiak, Ioan Dafinei, E. P. Makarov, V. D. Grigorieva, L. Cardani, Stefano Pirro, Giovanni Benato, E. Elkhoury, Francesca Bellini, P. de Marcillac, E. Yakushev, L. Gironi, Jonathan Ouellet, A. Giuliani, S. I. Konovalov, L. Pattavina, Ch. Bourgeois, V.B. Brudanin, M. Chapellier, M. Beretta, Lindley Winslow, Th. Redon, J. Billard, M. Pavan, L. Marini, Yao Shen, J. Johnston, A. Leder, Yu. A. Borovlev, E. Armengaud, E. Guerard, L. Ma, Claudia Tomei, F.A. Danevich, P. Loaiza, V. I. Umatov, S. Sorbino, A. S. Zolotarova, G. Pessina, B. Siebenborn, M. Briere, B. Schmidt, C. Nones, D.V. Poda, and V.I. Tretyak

Subjects
Physics, History, Particle physics, Scintillation, Physics - Instrumentation and Detectors, Light detection, Bolometer, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), High Energy Physics - Experiment, Computer Science Applications, Education, law.invention, High Energy Physics - Experiment (hep-ex), Full width at half maximum, CUORE, law, Double beta decay, Background suppression, ddc:530, Sensitivity (control systems), Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

The CUPID-Mo experiment is searching for neutrinoless double beta decay in $^{100}$Mo, evaluating the technology of cryogenic scintillating Li$_{2}^{100}$MoO$_4$ detectors for CUPID (CUORE Upgrade with Particle ID). CUPID-Mo detectors feature background suppression using a dual-readout scheme with Li$_{2}$MoO$_4$ crystals complemented by Ge bolometers for light detection. The detection of both heat and scintillation light signals allows the efficient discrimination of $\alpha$ from $\gamma$&$\beta$ events. In this proceedings, we discuss results from the first 2 months of data taking in spring 2019. In addition to an excellent bolometric performance of 6.7$\,$keV (FWHM) at 2615$\,$keV and an $\alpha$ separation of better than 99.9\% for all detectors, we report on bulk radiopurity for Th and U. Finally, we interpret the accumulated physics data in terms of a limit of $T_{1/2}^{0\nu}\,> 3\times10^{23}\,$yr for $^{100}$Mo and discuss the sensitivity of CUPID-Mo until the expected end of physics data taking in early 2020., Comment: Proceedings for TAUP 2019, submitted to IOP Journal of Physics: Conference Series

Published
2020
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12. Thermodynamic properties of single crystals based on lithium tungstate by reaction and DSC calorimetry

Author

N I Matskevich, V N Shlegel, D A Samoshkin, S V Stankus, A N Semerikova, V D Grigorieva, V P Zaitsev, V A Kuznetsov, S A Ponomareva, and A Yu Novikov

Subjects
History, Computer Science Applications, Education
Abstract

For the first time, single crystals of undoped lithium tungstate and lithium tungstate doped by 1.25% molybdenum were grown by the low-temperature-gradient Czochralski technique. The standard formation enthalpies, lattices enthalpies, stabilization energies, and the heat capacity were determined in the temperature range of 320-997 K. The lattice enthalpy dependence on Mo content was constructed.

Published
2021

13. The low temperature heat capacity of Li2Mo0.05W0.95O4

Author

A E Musikhin, M A Bespyatov, T M Kuzin, V D Grigorieva, and V N Shlegel

Subjects
History, Computer Science Applications, Education
Abstract

The heat capacity of a lithium tungstate single crystal doped by 5% molybdenum Li2Mo0.05W0.95O4 in the range of 78.5–302.8 K was measured by the adiabatic method. No anomalous behavior of heat capacity was found. The heat capacity function was obtained in the range of 0–303 K by extrapolating to zero temperature and fitting experimental points. Thermodynamic functions of entropy, enthalpy increment and Gibbs free energy at 298.15 K were calculated using the obtained data.

Published
2021

14. Development of $$^{100}\hbox {Mo}$$ 100 Mo -containing scintillating bolometers for a high-sensitivity neutrinoless double-beta decay search

Author

C. Augier, T. Bergmann, V. Sanglard, S. Di Domizio, M. Vignati, B. Paul, L. Hehn, X. F. Navick, J. W. Beeman, A. Giuliani, E. Queguiner, J. Billard, Andreas Fleischmann, Matthias Laubenstein, H. le Sueur, L. Cardani, L. Dumoulin, L. Devoyon, L. Pattavina, J. Gascon, A. S. Zolotarova, Stefano Pirro, V. Kozlov, L. Gastaldo, A. Cazes, T. Redon, Francesca Bellini, E. Yakushev, G. Piperno, O. Strazzer, Y. Penichot, I.M. Ivanov, S. Scorza, P. Pari, L. Pagnanini, V. D. Grigorieva, Noël Coron, A. Juillard, Matias Velázquez, F. Koskas, Claire A. Marrache-Kikuchi, P. Camus, V.N. Shlegel, K. Eitel, M. de Combarieu, S. V. Rozov, V. V. Kobychev, L. Vagneron, L. Bergé, Vl.I. Tretyak, Matias Rodrigues, R. S. Boiko, V. A. Kudryavtsev, E. Armengaud, F. Ferroni, A. Broniatowski, M. Pavan, Yong Jin, A. S. Barabash, N. Foerster, D. Tcherniakhovski, Alain Benoit, O. Plantevin, N.V. Ivannikova, Martin Loidl, P. de Marcillac, K. Schäffner, Matthias Kleifges, S. Marnieros, P. Magnier, C. Rusconi, M. Gros, C. Nones, D.V. Poda, D. M. Chernyak, B. Siebenborn, M. O. Nikolaichuk, Claudia Tomei, F.A. Danevich, Ya.V. Vasiliev, M. Mancuso, V. I. Umatov, S.I. Konovalov, Christian Enss, E. Olivieri, V. Humbert, S. Hervé, Marc Weber, N. Casali, V.B. Brudanin, M. Chapellier, L. Gironi, I. Dafinei, H. Kraus, G. Pessina, T.B. Bekker, E. P. Makarov, S. Nagorny, M. De Jesus, Silvia Capelli, V. Novati, and F. Charlieux

Subjects
Physics, Lithium molybdate, Recrystallization (geology), Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Bolometer, lcsh:Astrophysics, 01 natural sciences, law.invention, Nuclear physics, Full width at half maximum, chemistry.chemical_compound, chemistry, law, Double beta decay, 0103 physical sciences, lcsh:QB460-466, lcsh:QC770-798, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Sensitivity (control systems), Neutrino, 010306 general physics, Engineering (miscellaneous), Energy (signal processing)
Abstract

This paper reports on the development of a technology involving $$^{100}\hbox {Mo}$$ 100 Mo -enriched scintillating bolometers, compatible with the goals of CUPID, a proposed next-generation bolometric experiment to search for neutrinoless double-beta decay. Large mass ( $$\sim 1~\hbox {kg}$$ ∼ 1 kg ), high optical quality, radiopure $$^{100}\hbox {Mo}$$ 100 Mo -containing zinc and lithium molybdate crystals have been produced and used to develop high performance single detector modules based on 0.2–0.4 kg scintillating bolometers. In particular, the energy resolution of the lithium molybdate detectors near the Q-value of the double-beta transition of $$^{100}\hbox {Mo}$$ 100 Mo (3034 keV) is 4–6 keV FWHM. The rejection of the $$\alpha $$ α -induced dominant background above 2.6 MeV is better than $$8\sigma $$ 8 σ . Less than $$10~\upmu \hbox {Bq/kg}$$ 10 μ Bq/kg activity of $$^{232}\hbox {Th}\, (^{228}\hbox {Th})$$ 232 Th ( 228 Th ) and $$^{226}\hbox {Ra}$$ 226 Ra in the crystals is ensured by boule recrystallization. The potential of $$^{100}\hbox {Mo}$$ 100 Mo -enriched scintillating bolometers to perform high sensitivity double-beta decay searches has been demonstrated with only $$10~\hbox {kg}\times \hbox {d}$$ 10 kg × d exposure: the two neutrino double-beta decay half-life of $$^{100}\hbox {Mo}$$ 100 Mo has been measured with the up-to-date highest accuracy as $$T_{1/2}$$ T 1 / 2 = [6.90 ± 0.15(stat.) ± 0.37(syst.)] $$\times ~10^{18}~\hbox {years}$$ × 10 18 years . Both crystallization and detector technologies favor lithium molybdate, which has been selected for the ongoing construction of the CUPID-0/Mo demonstrator, containing several kg of $$^{100}\hbox {Mo}$$ 100 Mo .

Published
2017

15. Features of thermodynamic properties of single crystals on the basis of lithium tungstate: «thermodynamics – structure – functional characteristics» correlations

Author

V. A. Kuznetsov, N. I. Matskevich, V.N. Shlegel, S. V. Stankus, V. D. Grigorieva, and D. A. Samoshkin

Subjects
History, chemistry.chemical_compound, Materials science, Basis (linear algebra), chemistry, Physics::Instrumentation and Detectors, Lithium tungstate, Structure (category theory), Thermodynamics, Computer Science Applications, Education
Abstract

On the basis of obtained experimental data, the features of thermodynamic properties for lithium tungstate single crystals doped by molybdenum have been revealed. Correlations between enthalpies and structural parameters have been found. The relation between lattice energies and scintillation characteristics has been revealed.

Published
2020

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