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Kim, G. B.,Choi, S.,Danevich, F. A.,Fleischmann, A.,Kang, C. S.,Kim, H. J.,Kim, S. R.,Kim, Y. D.,Kim, Y. H.,Kornoukhov, V. A.,Lee, H. J.,Lee, J. H.,Lee, M. K.,Lee, S. J.,So, J. H.,Yoon, W. S. Hindawi Limited 2015 Advances in high energy physics Vol.2015 No.-
<P>We report the development of a CaMoO4crystal low temperature detector for the AMoRE neutrinoless double beta decay(0νββ)search experiment. The prototype detector cell was composed of a 216 g CaMoO4crystal and a metallic magnetic calorimeter. An overground measurement demonstrated FWHM resolution of 6–11 keV for full absorption gamma peaks. Pulse shape discrimination was clearly demonstrated in the phonon signals, and 7.6 σof discrimination power was found for theαandβ/γseparation. The phonon signals showed rise-times of about 1 ms. It is expected that the relatively fast rise-time will increase the rejection efficiency of two-neutrino double beta decay pile-up events which can be one of the major background sources in0νββsearches.</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.
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, 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>
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>