Preparation of low-radioactive high-purity enriched 100MoO3 powder for AMoRE-II experiment

Frontiers in Physics

Physics

Kevin Insik Hahn¹  JunSeok Choe²  Go Woon Kim²  Woon Gu Kang²  Su-Yeon Park²  Olga Gileva²  Eun Kyung Lee²  Yena Kim²  Hyojin Yeon²  KeonAh Shin²  Douglas S. Leonard²  Moo Hyun Lee³  Yeongduk Kim³  HyangKyu Park⁴  Hong Joo Kim⁵  Vitaly Milyutin⁶ 

[1] Center for Exotic Nuclear Studies, Institute for Basic Science (IBS), Daejeon, Republic of Korea;IBS School, University of Science and Technology (UST), Daejeon, Republic of Korea;Center for Underground Physics, Institute for Basic Science (IBS), Daejeon, Republic of Korea;Center for Underground Physics, Institute for Basic Science (IBS), Daejeon, Republic of Korea;IBS School, University of Science and Technology (UST), Daejeon, Republic of Korea;Department of Accelerator Science, Korea University, Sejong, Republic of Korea;Department of Physics, Kyungpook National University, Daegu, Republic of Korea;Froumkin’s Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences (IPCE RAS), Moscow, Russia;

关键词: MoO;    ultra-low radioactivity;    purification;    AMoRE-II;    ICP-MS;    HPGe array;   

DOI  :  10.3389/fphy.2023.1142136

 received in 2023-01-11, accepted in 2023-03-06,  发布年份 2023

来源: Frontiers

【 摘 要 】

This paper describes preparing radiopure molybdenum trioxide powder enriched with Mo-100 isotope for the AMoRE-II experiment. AMoRE-II, the second phase of the AMoRE experiments, will search for the neutrinoless double-beta decay (0νDBD) of the 100Mo isotope using over 100 kg of 100Mo embedded in 200 kg of ultra-pure Li2100MoO4 bolometric crystals. Efficient purification technology was developed and adapted to purify 100MoO3 powder with a 5 kg per month production capacity. Based on the ICP-MS analysis of purified powder, the 232Th and 238U were reduced to <9.4 μBq/kg and <50 μBq/kg, respectively. The concentrations of potassium, transition metals, and heavy metals were lower than 1 ppm. HPGe counting confirmed the reduction of progenies from the 232Th and 238U decay chains, reporting upper limits of <27 μBq/kg for 228Ac and <16 μBq/kg for 228Th. The 226Ra activity was acceptable at 110 ± 30 μBq/kg. In the last 3 years, 100 kg of pure 100MoO3 powder was produced. The production yield for the final purified product was above 90%, while irrecoverable losses were under 1.5%, and all by-products could be recycled further.

【 授权许可】

Unknown   
Copyright © 2023 Yeon, Choe, Gileva, Hahn, Kang, Kim, Kim, Kim, Kim, Lee, Lee, Leonard, Milyutin, Park, Park and Shin.