Low Radioactivity Techniques (LRT2022)

Preparation of the precursors for AMoRE-II crystals synthesis

Jun 15, 2022, 5:30 PM

15m

EEP 252 (South Dakota Mines)

Oral Presentation Purification Techniques for Solids LRT 2022 - presentations

Speaker

Olga Gileva (Center for Underground Physics at Institute of Basic Science, Daejeon, KOREA)

Description

Advanced Mo-based Rare process Experiment (AMoRE) is a series of experiments for the neutrinoless double beta decay of 100Mo using molybdate-based crystals, such as ${}^{40}$Ca${}^{100}$MoO${}_4$, Li${}_2$${}^{100}$MoO${}_4$, or Na${}_2$${}^{100}$Mo${}_2$O${}_7$. AMoRE phase-II aims to reach the internal background level below 5 $\times$ ${10}^{-6}$ ckky (count/kg/keV/year) in ROI using ~200 kg of bolometric crystals, which means levels for radioactive contaminants thorium, uranium, and radium are supposed to be below several $\mu$Bq/kg. For such a “zero-background” experiment, preparation of the initial materials used for crystal production is crucial. Molybdenum trioxide powder enriched with Mo-100 isotope (>99.6% enrichment, JSC ECP, Russia), ${}^{40}$CaCO${}_3$ powder depleted in ${}^{48}$Ca (FSUE Electrochimpribor, Russia), lithium and sodium carbonates (99.999% purity grade, off-the-shelf products) are main precursors used for the AMoRE-II crystal synthesis. This work will describe the purification, mass-production, and recycling of those precursors to perform such a high-scale experiment.

Presentation materials

LRT2022_AMoRE_purification_GilevaOlga_final.pdf