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Alenkov, V. V.,Buzanov, O. A.,Khanbekov, N.,Kim, S. K.,Kim, H. J.,Kornoukhov, V. N.,Kraus, H.,Mikhailik, V. B. WILEY‐VCH Verlag 2011 Crystal research and technology Vol.46 No.12
<P><B>Abstract</B></P><P>Calcium molybdate is considered as a very promising scintillator material for experimental studies of rare processes. This paper reports on the production and characterization of a <SUP>40</SUP>Ca<SUP>100</SUP>MoO<SUB>4</SUB> scintillator. Using the Czochralski technique, a crystal of high optical quality with total mass 0.55 kg, 42 mm diameter (minimum) and 53 mm 1ength of the cylindrical section was produced from isotopically enriched raw materials, containing 96.1% of <SUP>100</SUP>Mo and 99.964% of <SUP>40</SUP>Ca. To satisfy the requirement of low intrinsic radioactivity the purity of the materials was monitored at different stages of the production process and it is shown that the concentration of <SUP>238</SUP>U and <SUP>232</SUP>Th in the final crystal does not exceed 0.05 ppb. The scintillation properties of <SUP>40</SUP>Ca<SUP>100</SUP>MoO<SUB>4</SUB> were measured over the 8 – 300 K temperature range and it is found that the light yield of the <SUP>40</SUP>Ca<SUP>100</SUP>MoO<SUB>4</SUB> crystal is very similar to that of the CaMoO<SUB>4</SUB> reference scintillator. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)</P>
Lee, S.J.,Choi, J.H.,Danevich, F.A.,Jang, Y.S.,Kang, W.G.,Khanbekov, N.,Kim, H.J.,Kim, I.H.,Kim, S.C.,Kim, S.K.,Kim, Y.D.,Kim, Y.H.,Kobychev, V.V.,Kornoukhov, V.N.,Lee, J.I.,Lee, J.S.,Lee, K.B.,Lee, M North-Holland ; Elsevier Science Ltd 2011 Astroparticle physics Vol.34 No.9
The search for neutrinoless double beta decay (0νββ) is a key experiment for evaluating the mass of the neutrino and for determining the Majorana/Dirac nature of neutrinos. A scintillating CaMoO<SUB>4</SUB> crystal is a good material for use in investigating 0νββ with cryogenic detectors. The high transition energy (Q=3034keV) and nearly 10% natural abundance of <SUP>100</SUP>Mo, together with the scintillating property of the crystal, provide favorable conditions to search for 0νββ of <SUP>100</SUP>Mo. We report a prototype experiment operating at low temperatures using a CaMoO<SUB>4</SUB> crystal as a particle absorber. Prior to testing of isotopically-enriched <SUP>40</SUP>Ca<SUP>100</SUP>MoO<SUB>4</SUB> crystals, a CaMoO<SUB>4</SUB> crystal with Mo of natural isotopic composition was tested. Using a metallic magnetic calorimeter as a temperature sensor, we achieved high energy resolutions for alpha particles and low-energy gamma rays. This experiment shows the feasibility of scaling up the crystal size to perform a high sensitivity search for 0νββ decay of <SUP>100</SUP>Mo.