Publications (15)11.37 Total impact
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Article: Astrophysical and cosmological problems of invisible mass and dark energy in the Universe
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ABSTRACT: The Workshop on results of the Project Kosmomikrofizyka-2 (Astroparticle Physics) of the National Academy of Sciences (NAS) of Ukraine "Astrophysical and cosmological problems of invisible mass and dark energy in the Universe" was held on November 21-22, 2012 in the Institute for Nuclear Research, Kyiv, Ukraine (http://lpd.kinr.kiev.ua/kmf12). This Project was carried out during three years (2010-2012) by scientists from various universities and institutes of the National Academy of Sciences of Ukraine; it was a logical continuation of the previous scientific program of the NAS of Ukraine "Researches of structure and composition of the Universe, hidden mass and dark energy (Kosmomikrofizyka)" in 2007-2009. These programs were devoted to theoretical and experimental investigations in astronomy, astrophysics, cosmology, physics of atomic nuclei and particle physics, which are related with the problems of dark matter and dark energy in the Universe.04/2013; -
Article: CdWO4 crystal scintillators from enriched isotopes for double beta decayexperiments
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ABSTRACT: Cadmium tungstate crystal scintillators enriched in 106Cd and 116Cd were developed. The produced scintillators exhibit good optical and scintillation properties, and a low level of radioactive contamination. Experiments to search for double beta decay of 106Cd and 116Cd are in progress at the Gran Sasso National Laboratories of the INFN (Italy). Prospects to further improve the radiopurity of the detectors by recrystallization are discussed.Radiation Measurements 03/2013; · 1.18 Impact Factor -
Article: Searches for neutrinoless resonant double electron captures at LNGS
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ABSTRACT: Several experiments were performed during last years at underground (3600 m w.e.) Laboratori Nazionali del Gran Sasso (LNGS) of the INFN (Italy) to search for resonant 2$\varepsilon0\nu$ captures in 96Ru, 106Cd, 136Ce, 156Dy, 158Dy, 180W, 184Os, 190Pt with the help of HP Ge semiconductor detectors, and ZnWO4 and 106CdWO4 crystal scintillators. No evidence for r-2$\varepsilon0\nu$ decays was found, and only T_{1/2} limits were established in the range of 10^{14}-10^{21} yr.Journal of Physics Conference Series 07/2012; 375:042024. -
Article: The growth of ZnWO4 and CdWO4 single crystals from melt by the low thermal gradient Czochralski technique
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ABSTRACT: The features of growth of single crystals of cadmium and zinc tungstates by the low thermal gradient Czochralski technique have been investigated. The effect of change in the growth conditions on the crystal morphology and the capture of macroinclusions is studied. Crystals 45 mm in diameter and up to 150 mm long (cylindrical part) are obtained. Their optical and scintillation characteristics are measured.Crystallography Reports 04/2012; 54(4):689-691. · 0.47 Impact Factor -
Article: Search for double-β decay processes in 106Cd with the help of a 106CdWO4 crystal scintillator
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ABSTRACT: A search for double beta processes in Cd-106 was carried out at the Gran Sasso National Laboratories of the INFN (Italy) with the help of a (CdWO4)-Cd-106 crystal scintillator (215 g) enriched in Cd-106 up to 66%. After 6590 h of data taking, new improved half-life limits on the double beta decay processes in Cd-106 were established at the level of 10(19)-10(21) yr; in particular, T-1/2(2 nu epsilon beta) >= 2.1 x 10(20) yr, T-1/2(2 nu epsilon beta+) >= 4.3 x 10(20) yr, and T-1/2(0 nu 2 epsilon) >= 1.0 x 10(21) yr. The resonant neutrinoless double-electron captures to the 2718-, 2741-, and 2748-keV excited states of Pd-106 are restricted to T-1/2(0 nu 2K) >= 4.3 x 10(20) yr, T-1/2(0 nu KL1) >= 9.5 x 10(20) yr, and T-1/2(0 nu KL3) >= 4.3 x 10(20) yr, respectively (all limits at 90% confidence level). A possible resonant enhancement of the 0 nu 2 epsilon processes is estimated in the framework of the quasiparticle random phase approximation (QRPA) approach. Radioactive contamination of the (CdWO4)-Cd-106 crystal scintillator is reported.Physical Review C 04/2012; 85(4):044610. · 3.31 Impact Factor -
Conference Proceeding: Search for double beta decay of Cd-106 by using isotopically enriched (CdWO4)-Cd-106 crystal scintillator
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ABSTRACT: A search for double beta processes in Cd-106 was carried out at the Gran Sasso National Laboratories of the INFN (Italy) by using a CdWO4 crystal scintillator (mass of 215 g) enriched in Cd-106 up to 66%. After 6590 h of data taking, half-life limits on double beta processes in Cd-106 were set at level of 10(19) - 10(21) yr. A possible resonant enhancement of the 0 nu 2 epsilon processes has also been estimated in the framework of the QRPA approach.12TH INTERNATIONAL CONFERENCE ON TOPICS IN ASTROPARTICLE AND UNDERGROUND PHYSICS (TAUP 2011), PTS 1-6; 01/2012 -
Article: Potential of a next generation neutrinoless double beta decay experiment based on ZnMoO4 scintillating bolometers
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ABSTRACT: The search for neutrinoless double beta decay probes lepton number conservation with high sensitivity and investigates the neutrino nature and mass scale. Experiments presently in preparation will cover the quasi-degeneracy region of the neutrino mass pattern. Probing the so-called inverted hierarchy region requires improved sensitivities and next-generation experiments, based either on large expansions of the present searches or on new ideas. We examine here the potential of a novel technology relying on ZnMoO4 scintillating bolometers, which can provide an experiment with background close to zero in the ton x year exposure scale. The promising performance of a pilot detector is presented, both in terms of energy resolution and background control. A preliminary study of the sensitivities of future experiments shows that the inverted hierarchy region is within the reach of the technique here proposed. A realistic phased approach program towards a next-generation search is presented and briefly discussed.12/2011; -
Article: Low background detector with enriched 116CdWO4 crystal scintillators tosearch for double β decay of 116Cd
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ABSTRACT: A cadmium tungstate crystal boule enriched in $^{116}$Cd to 82% with mass of 1868 g was grown by the low-thermal-gradient Czochralski technique. The isotopic composition of cadmium and the trace contamination of the crystal were estimated by High Resolution Inductively Coupled Plasma Mass-Spectrometry. The crystal scintillators produced from the boule were subjected to characterization that included measurements of transmittance and energy resolution. A low background scintillation detector with two $^{116}$CdWO$_4$ crystal scintillators (586 g and 589 g) was developed. The detector was running over 1727 h deep underground at the Gran Sasso National Laboratories of the INFN (Italy), which allowed to estimate the radioactive contamination of the enriched crystal scintillators. The radiopurity of a third $^{116}$CdWO$_4$ sample (326 g) was tested with the help of ultra-low background high purity germanium $\gamma$ detector. Monte Carlo simulations of double $\beta$ processes in $^{116}$Cd were used to estimate the sensitivity of an experiment to search for double $\beta$ decay of $^{116}$Cd.Journal of Instrumentation 08/2011; 6(8):P08011. · 1.87 Impact Factor -
Article: Low background detector with enriched 116CdWO4 crystal scintillators to search for double β decay of 116Cd
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ABSTRACT: A cadmium tungstate crystal boule enriched in Cd-116 to 82% with mass of 1868 g was grown by the low-thermal-gradient Czochralski technique. The isotopic composition of cadmium and the trace contamination of the crystal were estimated by High Resolution Inductively Coupled Plasma Mass-Spectrometry. The crystal scintillators produced from the boule were subjected to characterization that included measurements of transmittance and energy resolution. A low background scintillation detector with two (CdWO4)-Cd-116 crystal scintillators (586 g and 589 g) was developed. The detector was running over 1727 h deep underground at the Gran Sasso National Laboratories of the INFN (Italy), which allowed to estimate the radioactive contamination of the enriched crystal scintillators. The radiopurity of a third (CdWO4)-Cd-116 sample (326 g) was tested with the help of ultra-low background high purity germanium gamma detector. Monte Carlo simulations of double beta processes in Cd-116 were used to estimate the sensitivity of an experiment to search for double beta decay of Cd-116.Journal of Instrumentation 08/2011; 6(8):P08011. · 1.87 Impact Factor -
Article: Radioactive contamination of ZnWO4 crystal scintillators
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ABSTRACT: The radioactive contamination of ZnWO4 crystal scintillators has been measured deep underground at the Gran Sasso National Laboratory (LNGS) of the INFN in Italy with a total exposure 3197 kg x h. Monte Carlo simulation, time-amplitude and pulse-shape analyses of the data have been applied to estimate the radioactive contamination of the ZnWO4 samples. One of the ZnWO4 crystals has also been tested by ultra-low background gamma spectrometry. The radioactive contaminations of the ZnWO4 samples do not exceed 0.002 -- 0.8 mBq/kg (depending on the radionuclide), the total alpha activity is in the range: 0.2 - 2 mBq/kg. Particular radioactivity, beta active 65Zn and alpha active 180W, has been detected. The effect of the re-crystallization on the radiopurity of the ZnWO4 crystal has been studied. The radioactive contamination of samples of the ceramic details of the set-ups used in the crystals growth has been checked by low background gamma spectrometry. A project scheme on further improvement of the radiopurity level of the ZnWO4 crystal scintillators is briefly addressed.Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 01/2011; 626–627:31–38. · 1.21 Impact Factor -
Article: Radiopurity of ZnWO4 crystal scintillators
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ABSTRACT: Recently ZnWO4 was proposed as perspective material for low-counting experiments to search for rare processes. Such experiments demand high radiopurity of ZnWO4 crystal scintillators. With this aim radioactive contamination of large volume (0.1–0.7 kg) ZnWO4 crystal scintillators were measured in the underground Laboratori Nazionali del Gran Sasso of the INFN at the depth of ≈ 3600 m water equivalent.Acta Physica Polonica Series a 01/2010; 117(23):139-142. · 0.44 Impact Factor -
Article: Radiopurity of ZnWO4 Crystal Scintillators
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ABSTRACT: Recently ZnWO4 was proposed as perspective material for low-counting experiments to search for rare processes. Such experiments demand high radiopurity of ZnWO4 crystal scintillators. With this aim radioactive contamination of large volume (0.1-0.7 kg) ZnWO4 crystal scintillators were measured in the under.-round Laboratori Nazionali del Gran Sasso of the INFN at the depth of approximate to 3600 m water equivalent.Acta Physica Polonica Series a 01/2010; 117:139-142. · 0.44 Impact Factor -
Conference Proceeding: First Results of the Experiment to Search for 2 beta Decay of Cd-106 with the Help of (CdWO4)-Cd-106 Crystal Scintillators
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ABSTRACT: An experiment to search for 2 beta processes in Cd-106 with the help of (CdWO4)-Cd-106 crystal scintillator (mass of 215 g), enriched in Cd-106 up to 66%, is in progress at the Gran Sasso National Laboratories of the INFN (Italy). After 1320 h of data taking, limits on double beta processes in Cd-106 have been established on the level of 10(19) - 10(20) yr, in particular (all the results at 90% C.L.): T-1/2(0 nu 2 epsilon) > 3.6 x 10(20) yr, T-1/2(2 nu epsilon beta(+)) > 7.2 x 10(19) yr, and T-1/2(2 nu 2 beta(+)) > 2.5 x 10(20) yr. Resonant O nu 2 epsilon processes have been restricted as T-1/2(O nu 2K) > 1.4 x 10(20) yr and T-1/2(O nu LK) > 3.2 x 10(20) yr. A possible resonant enhancement of the O nu 2 epsilon processes is estimated in the framework of the QRPA approach.EXOTIC NUCLEI AND NUCLEAR - PARTICLE ASTROPHYSICS III: FROM NUCLEI TO STARS; 01/2010 -
Article: Further study of CdWO4 crystal scintillators as detectors for high sensitivity double beta experiments: scintillation properties and pulse-shape discrimination
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ABSTRACT: Energy resolution, light yield, non-proportionality in the scintillation response, alpha/beta ratio, pulse shape for gamma rays and alpha particles were studied with CdWO4 crystal scintillators. Some indication for a difference in the emission spectra for gamma rays and alpha particles was observed. No dependence of CdWO4 pulse shape on emission spectrum wavelengths under laser, alpha particles and gamma ray excitation was observed. Dependence of scintillation pulse shape for gamma quanta and alpha particles and pulse-shape discrimination ability on temperature was measured in the range of 0-24 degrees.09/2006; -
Article: Chromium ion incorporation in the crystal structure of BGO
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ABSTRACT: Comprehensive investigations have been performed by EPR and optical spectroscopy for Bi3GeO4 crystals doped with chromium ions. It is demonstrated that the known optical absorption spectrum for chromium ions, specifically, the triplet in the region 600–900 nm has an analog in the EPR spectra — the center with electron spin S = 1. The spectrum is described by the spin-Hamiltonian with the parameters D = 550 G, E = 10 G, g xx = g yy = 1.915, g zz = 1.932. The EPR spectrum is dictated by Cr4+ incorporation at the germanium sites. Luminescence observed in the region 1.2–1.7 µm is also caused by transitions of Cr4+ with tetrahedral surroundings to germanium sites.Journal of Structural Chemistry 04/2005; 46(3):431-437. · 0.59 Impact Factor
Top co-authors
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Institutions
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2012
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University of Technology Munich
München, Bavaria, Germany
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2010
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Novosibirsk Institute of Organic Chemistry
Novosibirsk, Novosibirskaya Oblast', Russia -
Texas A&M University
College Station, TX, USA
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