Determination of Mo- and Ca-isotope ratios in Ca100MoO4 crystal for AMoRE-I experiment

S. Karki, P. Aryal, H. J. Kim, Y. D. Kim, H. K. Park

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Abstract

The first phase of the AMoRE (Advanced Mo-based Rare process Experiment) is to search for neutrinoless double-beta decay of 100Mo with calcium molybdate (Ca100MoO4) crystals enriched in 100Mo and depleted in 48Ca using a cryogenic technique at Yangyang underground laboratory in Korea. It is important to know 100Mo- and 48Ca-isotope ratios in Ca100MoO4 crystal to estimate half-life of 100Mo decays and to 2νββ background from 48Ca. We employed the ICP-MS (Inductive Coupled Plasma Mass Spectrometer) to measure 100Mo- and 48Ca-isotope ratios in Ca100MoO4 crystal. The measured results for 100Mo- and 48Ca-isotope ratios in the crystal are (94.6±2.8)% and (0.00211±0.00006)%, respectively, where errors are included both statistical and systematic uncertainties.

Keywords

  • Detectors
  • Isotope
  • Neutrinoless double beta decay
  • Underground experiment

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