Hydrogen reduction of enriched germanium dioxide and zone-refining for the LEGEND experiment

Hydrogen reduction of enriched germanium dioxide and zone-refining for the LEGEND experiment
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LEGEND 实验中富集二氧化锗的氢还原和区域精炼

DOI:
10.1088/1748-0221/15/12/p12010
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发表时间:
2020
影响因子:
1.3
通讯作者:
Sumathi, R.R.
Sumathi, R.R.
中科院分区:
工程技术4区
文献类型:
--
作者:
Gradwohl, K.-P.;Moras, O.;Janicskó-Csáthy, J.;Schönert, S.;Sumathi, R.R.

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目前正在建设中的LEGEND实验将操作一个大型锗探测器阵列,以搜索76 Ge的无中微子双β衰变。在本文中,我们报告的过程中的氢还原的二氧化锗富集在76锗的努力,以制造探测器的LEGEND实验的一部分发展。通过动力学未反应的收缩模型,并测试了一批天然GeO 2的过程进行了优化。我们完成了一批23公斤同位素富集锗的还原,平均收率为99.85%。随后,通过区域精炼将锗纯化至本征纯度,并且实现了99.05%的锗总收率。使用一个中间的地下存储,平均宇宙成因暴露156小时的积累。特别注意避免和回收过程中的损失。
The LEGEND experiment, now under construction, will operate a large array of germanium detectors for the search of neutrinoless double-beta decay of 76 Ge. In this paper we report on the process development for the hydrogen reduction of germanium dioxide enriched in 76 Ge as part of the effort to manufacture detectors for the LEGEND experiment. The process was optimized via a kinetic un-reacted shrinking model and tested with a batch of natural GeO 2. We completed the reduction of a batch of 23 kg isotopically enriched germanium with an average yield of 99.85%. Subsequently, the germanium was purified to intrinsic purity by zone-refining and an overall germanium yield of 99.05% was achieved. Using an intermediate underground storage, an average cosmogenic exposure of 156 h was accumulated. Special care was taken to avoid and recycle losses during the process.
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