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Thermal Model and Optimization of a Large Crystal Detector Using a Metallic Magnetic Calorimeter
Kim, G. B.,Choi, S.,Jang, Y. S.,Kim, H. J.,Kim, Y. H.,Kobychev, V. V.,Lee, H. J.,Lee, J. H.,Lee, J. Y.,Lee, M. K.,Lee, S. J.,Yoon, W. S. Springer-Verlag 2014 Journal of low temperature physics Vol.176 No.5
Simulations of background sources in AMoRE-I experiment
Luqman, A.,Ha, D.H.,Lee, J.J.,Jeon, E.J.,Jo, H.S.,Kim, H.J.,Kim, Y.D.,Kim, Y.H.,Kobychev, V.V.,Lee, H.S.,Park, H.K.,Siyeon, K.,So, J.H.,Tretyak, V.I.,Yoon, Y.S. Elsevier 2017 Nuclear instruments & methods in physics research. Vol.855 No.-
<P><B>Abstract</B></P> <P>The first phase of the Advanced Mo-based Rare process Experiment (AMoRE-I), an experimental search for neutrinoless double beta decay ( 0 ν β β ) of <SUP>100</SUP>Mo in calcium molybdate ( <SUP> 40 </SUP> Ca<SUP>100</SUP>MoO<SUB>4</SUB>) crystal using cryogenic detection techniques, is in preparation at the YangYang underground laboratory (Y2L) in Korea. A GEANT4 based Monte Carlo simulation was performed for the first-phase AMoRE detector and shield configuration. Background sources such as <SUP>238</SUP>U, <SUP>232</SUP>Th, <SUP>235</SUP>U, and <SUP>210</SUP>Pb from inside the crystals, surrounding materials, outer shielding walls of the Y2L cavity were simulated. The estimated background rate in the region of interest was estimated to be < 1.5 × <SUP> 10 − 3 </SUP> counts/keV/kg/yr (ckky). The effects of random coincidences between backgrounds and two-neutrino double beta decays of <SUP>100</SUP>Mo as a potential background source were estimated to be < 2.3 × <SUP> 10 − 4 </SUP> ckky.</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>
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.