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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>
Kim, H J,Annenkov, A N,Boiko, R S,Buzanov, O A,Chernyak, D M,Cho, J H,Danevich, F A,Dossovitsky, A E,Rooh, Gul,Kang, U K,Kim, M J,Kim, S C,Kim, S K,Kim, Y D,Kobychev, V V,Kornoukhov, V N,Kosmyna, M B IEEE 2010 IEEE transactions on nuclear science Vol.57 No.3
<P>Search for neutrino-less double beta decay of <SUP>100</SUP>Mo is proposed using active method with Ca <SUP>100</SUP>MoO<SUB>4</SUB> scintillation crystals which show the brightest scintillation light among variety of inorganic scintillation materials containing Mo. Study of X-ray luminescence and scintillation properties such as energy response, number of photoelectrons/keV, absolute light yield, decay time, pulse shape discrimination and radioactive contamination of CaMoO<SUB>4</SUB> crystals grown by the Czochralski method with different conditions are presented. Further R&D of resolution optimization, crystal quality improvement and background reduction are underway. Significant improvement of sensitivity to neutrino-less double beta decay can be achieved by using 10 Mo enriched Ca <SUP>100</SUP>MoO<SUB>4</SUB> crystals with good energy resolution and low background. Further reduction of background induced by 48 Ca two neutrino double beta decay can be achieved by using <SUP>48</SUP>Ca depletion. We are planning to install several kilograms of Ca <SUP>100</SUP>MoO<SUB>4</SUB> crystals depleted in <SUP>48</SUP>Ca at underground laboratory for the neutrino-less double beta decay experiment in the near future.</P>
So, J. H.,Kim, H. J.,Alenkov, V. V.,Annenkov, A. N.,Bhang, H.,Boiko, R. S.,Buzanov, O. A.,Chernyak, D. M.,Choi, J. H.,Choi, S.,Danevich, F. A.,Efendiev, K. V.,Gangapshev, A. M.,Gavryluk, Y. M.,Gezhaev IEEE 2012 IEEE transactions on nuclear science Vol.59 No.5
<P>Scintillation properties and radioactive contamination of calcium molybdate scintillating crystals depleted in <SUP>48</SUP>Ca and enriched in <SUP>100</SUP>Mo (<SUP>40</SUP>Ca<SUP>100</SUP>MoO<SUB>4</SUB> ) have been studied to prepare a <SUP>100</SUP>Mo-based neutrinoless double beta decay experiment. The prospects of a neutrinoless double beta decay experiment using <SUP>40</SUP>Ca<SUP>100</SUP>MoO<SUB>4</SUB> crystals are discussed.</P>
Lee, J. Y.,Alenkov, V.,Ali, L.,Beyer, J.,Bibi, R.,Boiko, R. S.,Boonin, K.,Buzanov, O.,Chanthima, N.,Cheoun, M. K.,Chernyak, D. M.,Choi, J.,Choi, S.,Danevich, F. A.,Djamal, M.,Drung, D.,Enss, C.,Fleisc IEEE 2016 IEEE transactions on nuclear science Vol.63 No.2
<P>A calcium molybdate (CaMoO4) crystal scintillator, with molybdenum enriched in Mo-100 and calcium depleted in Ca-48 ((CaMoO4)-Ca-40-Mo-100), was developed by the Advanced Molybdenum based Rare process Experiment (AMoRE) collaboration to search for a neutrinoless double beta (0 nu beta beta) decay of Mo-100. We are planning to use about 10 kg of (CaMoO4)-Ca-40-Mo-100 crystals as cryogenic bolometers for the first phase of the experiment (AMoRE-I) at the Yang Yang underground laboratory (Y2L) in Korea. This experiment calls for an extremely low level of radioactive contamination in detectors, particularly by thorium, uranium, and radium decay chains. We measured scintillation properties and radioactive contamination of CaMoO4 and (CaMoO4)-Ca-40-Mo-100 crystals at the Y2L. We also estimated the acceptable level of internal radioactive background using Monte Carlo simulation for the AMoRE-I.</P>