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Lobanov D.N.,RAS Institute for Physics of Microstructures | Novikov A.V.,RAS Institute for Physics of Microstructures | Yunin P.A.,RAS Institute for Physics of Microstructures | Skorohodov E.V.,RAS Institute for Physics of Microstructures | And 7 more authors.
Semiconductors | Year: 2016

In this publication, the results of development of the technology of the epitaxial growth of GaN on single-crystal langasite substrates La3Ga5SiO14 (0001) by the plasma-assisted molecular-beam epitaxy (PA MBE) method are reported. An investigation of the effect of the growth temperature at the initial stage of deposition on the crystal quality and morphology of the obtained GaN layer is performed. It is demonstrated that the optimal temperature for deposition of the initial GaN layer onto the langasite substrate is about ~520°C. A decrease in the growth temperature to this value allows the suppression of oxygen diffusion from langasite into the growing layer and a decrease in the dislocation density in the main GaN layer upon its subsequent high-temperature deposition (~700°C). Further lowering of the growth temperature of the nucleation layer leads to sharp degradation of the GaN/LGS layer crystal quality. As a result of the performed research, an epitaxial GaN/LGS layer with a dislocation density of ~1011 cm–2 and low surface roughness (<2 nm) is obtained. © 2016, Pleiades Publishing, Ltd.


Lee J.Y.,Kyungpook National University | Alenkov V.,JSC FOMOS Materials | Ali L.,Kyungpook National University | Beyer J.,Physikalisch - Technische Bundesanstalt | And 87 more authors.
IEEE Transactions on Nuclear Science | Year: 2016

A calcium molybdate (CaMoO4) crystal scintillator, with molybdenum enriched in 100Mo and calcium depleted in 48Ca (40Ca100MoO4), was developed by the Advanced Molybdenum based Rare process Experiment (AMoRE) collaboration to search for a neutrinoless double beta (0ν β β) decay of 100Mo. We are planning to use about 10 kg of 40Ca100MoO4 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 40Ca100MoO4 crystals at the Y2L. We also estimated the acceptable level of internal radioactive background using Monte Carlo simulation for the AMoRE-I. © 2016 IEEE.


Alenkov V.V.,JSC FOMOS Materials | Buzanov O.A.,JSC FOMOS Materials | Khanbekov N.,Institute of Theoretical and Experimental Physics | Kim S.K.,Seoul National University | And 5 more authors.
Crystal Research and Technology | Year: 2011

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 40Ca100MoO4 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 100Mo and 99.964% of 40Ca. 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 238U and 232Th in the final crystal does not exceed 0.05 ppb. The scintillation properties of 40Ca 100MoO4 were measured over the 8 - 300 K temperature range and it is found that the light yield of the 40Ca 100MoO4 crystal is very similar to that of the CaMoO 4 reference scintillator. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Kim H.J.,Kyungpook National University | Annenkov A.N.,Moscow Institute of Steel And Alloys | Boiko R.S.,Institute for Nuclear Research of Ukraine | Buzanov O.A.,JSC Fomos Materials | And 26 more authors.
IEEE Transactions on Nuclear Science | Year: 2010

Search for neutrino-less double beta decay of 100Mo is proposed using active method with Ca 100MoO4 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 CaMoO4 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 100Mo enriched Ca 100MoO4 crystals with good energy resolution and low background. Further reduction of background induced by 48Ca two neutrino double beta decay can be achieved by using 48Ca depletion. We are planning to install several kilograms of Ca100MoO4 crystals depleted in 48Ca at underground laboratory for the neutrino-less double beta decay experiment in the near future. © 2010 IEEE.


So J.H.,Kyungpook National University | Kim H.J.,Kyungpook National University | Alenkov V.V.,JSC FOMOS Materials | Annenkov A.N.,Moscow Institute of Steel And Alloys | And 48 more authors.
IEEE Transactions on Nuclear Science | Year: 2012

Scintillation properties and radioactive contamination of calcium molybdate scintillating crystals depleted in 48 Ca and enriched in 100 Mo ( 40 Ca 100 MoO 4 ) have been studied to prepare a 100Mo-based neutrinoless double beta decay experiment. The prospects of a neutrinoless double beta decay experiment using 40Ca 100 MoO 4 crystals are discussed. © 2012 IEEE.


So J.H.,Kyungpook National University | Kim H.J.,Kyungpook National University | Alenkov V.V.,JSC FOMOS Materials | Annenkov A.N.,Moscow Institute of Steel And Alloys | And 52 more authors.
IEEE Nuclear Science Symposium Conference Record | Year: 2012

The resent observations of neutrino oscillations are conclusive evidence that the neutrino has a non-zero mass, and provides motivation for neutrinoless double beta decay (0ν DBD) searches. Searches for 0ν DBD are challenging experimental approaches aimed at establishing the neutrino's nature (Dirac or Majorana) and absolute mass scale [1-3]. © 2012 IEEE.

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