Enriched Crystal Scintillators for 2β Experiments

Polischuk, O. G.

doi:10.3390/physics3010009

Cited by 4 publications

(2 citation statements)

References 97 publications

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“…In particular, 40 K can be found as a result of an initial contamination of the powder used to grow the crystals [31]. Some anthropogenic radionuclides due to fall out can also be found in enriched crystals [55], thus, we have included the bulk contaminations 87 Rb and 90 Sr+ 90 Y, which are pure 𝛽-emitters. 99 Mo was produced by activation during a neutron calibration with an AmBe source.…”

Section: Background Sources Listmentioning

confidence: 99%

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

et al. 2022

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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 $$\left<m_{\beta \beta }\right>$$ m β β $$<~{(0.28{-}0.49)} $$ < ( 0.28 - 0.49 ) eV, dependent upon the nuclear matrix element utilized.

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Section: Background Sources Listmentioning

confidence: 99%

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

et al. 2022

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“…Moreover, low background crystal scintillators are being used for a long time in rare α and β decays (see e.g., [78]). Hoverer, a very wide choice of scintillators is available for DBD experiments, such as CdWO 4 (due to 106 Cd, 108 Cd, 114 Cd, 116 Cd, 180 W, 186 W), CaMoO 4 (due to 100 Mo), and their enrichments (such as 106 Cd, 116 Cd and 100 Mo) [31,[79][80][81][82][83][84] [51][52][53]58,[91][92][93][94][95][96][97][98][99][100][101][102][103][104]. Moreover, as other example, rare-earth-doped scintillators (CaF 2 (Eu), LaCl 3 (Ce), etc.)…”

Section: Figurementioning

confidence: 99%

Status and Perspectives of 2ϵ, ϵβ+ and 2β+ Decays

2021

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This paper reviews the main experimental techniques and the most significant results in the searches for the 2ϵ, ϵβ+ and 2β+ decay modes. Efforts related to the study of these decay modes are important, since they can potentially offer complementary information with respect to the cases of 2β− decays, which allow a better constraint of models for the nuclear structure calculations. Some positive results that have been claimed will be mentioned, and some new perspectives will be addressed shortly.

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The background model of the CUPID-Mo $$0\nu \beta \beta $$ experiment

Collaboration¹,

Augier³

et al. 2023

Eur. Phys. J. C

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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.

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Enriched Crystal Scintillators for 2β Experiments

Cited by 4 publications

References 97 publications

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

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

Status and Perspectives of 2ϵ, ϵβ+ and 2β+ Decays

The background model of the CUPID-Mo $$0\nu \beta \beta $$ experiment

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