Determination of Mo- and Ca-isotope ratios in ^{Ca 100} _{MoO 4} crystal for AMoRE-I experiment

다국어 초록 (Multilingual Abstract)

<P><B>Abstract</B></P> <P>The first phase of the AMoRE (Advanced Mo-based Rare process Experiment) is to search for neutrinoless double-beta decay of <SUP>100</SUP>Mo with calcium molybdate ( <SUP> Ca 100 </SUP> <SUB> MoO 4 </SUB> ) crystals enriched in <SUP>100</SUP>Mo and depleted in <SUP>48</SUP>Ca using a cryogenic technique at Yangyang underground laboratory in Korea. It is important to know <SUP>100</SUP>Mo- and <SUP>48</SUP>Ca-isotope ratios in <SUP> Ca 100 </SUP> <SUB> MoO 4 </SUB> crystal to estimate half-life of <SUP>100</SUP>Mo decays and to 2 ν β β background from <SUP>48</SUP>Ca. We employed the ICP-MS (Inductive Coupled Plasma Mass Spectrometer) to measure <SUP>100</SUP>Mo- and <SUP>48</SUP>Ca-isotope ratios in <SUP> Ca 100 </SUP> <SUB> MoO 4 </SUB> crystal. The measured results for <SUP>100</SUP>Mo- and <SUP>48</SUP>Ca-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.</P>