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Papynov, E.K.,Belov, A.A.,Shichalin, O.O.,Buravlev, I. Yu,Azon, S.A.,Golub, A.V.,Gerasimenko, A.V.,Parotkina, Yu. А.,Zavjalov, A.P.,Tananaev, I.G.,Sergienko, V.I. Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.7
In the present study, an original spark plasma sintering-reactive synthesis (SPS-RS) method for minerallike ceramic materials based on SrAl<sub>2</sub>Si<sub>2</sub>O<sub>8</sub> feldspar-like skeleton structure was used for the first time, promising solid-state matrices for reliable immobilization of high-energy <sup>90</sup>Sr. The method is based on the "in-situ" reaction of a mixture of SrO, Al<sub>2</sub>O<sub>3</sub> and SiO<sub>2</sub> oxides when heated by a unipolar pulsed current under compacting pressure. The phase and elemental composition structure were studied. The dynamics of the consolidation of the reaction mixture of oxides was studied in the range of 900-1200 ℃. The study found the temperature of the high-speed (minutes) SPS-RS formation of single-phase SrAl<sub>2</sub>Si<sub>2</sub>O<sub>8</sub> composition ceramic in the absence of intermediate reaction products with a relative density of up to 99.2% and compressive strength up to 145 MPa and a strontium leaching rate of 10<sup>-4</sup>g/cm<sup>2</sup>·day.
First search for Lorentz andCPTviolation in double beta decay with EXO-200
Albert, J. B.,Barbeau, P. S.,Beck, D.,Belov, V.,Breidenbach, M.,Brunner, T.,Burenkov, A.,Cao, G. F.,Chambers, C.,Cleveland, B.,Coon, M.,Craycraft, A.,Daniels, T.,Danilov, M.,Daugherty, S. J.,Davis, C. American Physical Society 2016 Physical Review D Vol.93 No.7
<P>A search for Lorentz- and CPT-violating signals in the double beta decay spectrum of Xe-136 has been performed using an exposure of 100 kg . yr with the EXO-200 detector. No significant evidence of the spectral modification due to isotropic Lorentz -violation was found, and a two-sided limit of -2.65 x 10(-5) GeV < (a)(of),(,3r) < 7.60 x 10(-6) GeV (90% C.L.) is placed on the relevant coefficient within the Standard -Model Extension (SME). This is the first experimental study of the effect of the SME-defined oscillation -free and momentum-independent neutrino coupling operator on the double beta decay process.</P>
Search for2νββdecay ofXe136to the01+excited state ofBa136with the EXO-200 liquid xenon detector
Albert, J. B.,Auty, D. J.,Barbeau, P. S.,Beck, D.,Belov, V.,Breidenbach, M.,Brunner, T.,Burenkov, A.,Cao, G. F.,Chambers, C.,Chaves, J.,Cleveland, B.,Coon, M.,Craycraft, A.,Daniels, T.,Danilov, M.,Dau American Physical Society 2016 Physical Review C Vol.93 No.3
<P>EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless pp decay of Xe-136 to the ground state of Ba-136. We report here on a search for the two -neutrino pp decay of Xe-136 to the first 0+ excited state, 0(1)(+), of Ba-136 based on a 100 kg yr exposure of Xe-136. Using a specialized analysis employing a machine learning algorithm, we obtain a 90% CL half-life sensitivity of 1.7 x 10(24) yr. We find no statistically significant evidence for the 20P decay to the excited state resulting in a lower limit of Ti-1/2(7 nu) (0(+) -> 0(1)(+)) > 6.9 x10(23) yr at 90% CL. This observed limit is consistent with the estimated half-life of 2.5 x 10(25) yr.</P>
Spark plasma sintering of UO2 fuel composite with Gd2O3 integral fuel burnable absorber
Papynov E.K.,Shichalin O.O.,Belov A.A.,Portnyagin A.S.,Buravlev I.Yu,Mayorov V.Yu,Sukhorada A.E.,Gridasova E.A.,Nomerovskiy A.D.,Glavinskaya V.O.,Tananaev I.G.,Sergienko V.I. 한국원자력학회 2020 Nuclear Engineering and Technology Vol.52 No.8
The paper studies spark plasma sintering (SPS) of industrially used UO2-based fuel containing integral fuel burnable absorber (IFBA) of neutrons Gd2O3. Densification dynamics of pristine UO2 powder and the one added with 2 and 8 wt% of Gd2O3 under ultrasonication in liquid has been studied under SPS conditions at 1050, 1250, and 1450 C. Effect of sintering temperature on phase composition as well as on O/U stoichiometry has been investigated for UO2 SPS ceramics. Sintering of uranium dioxide added with Gd2O3 yields solid solution (U,Gd)O2, which is isostructural to UO2. SEM with EDX and metallography were implemented to analyze the microstructure of the obtained UO2 ceramics and composite UO2- Gd2O3 one, particularly, open porosity, defects, and Gd2O3 distribution were studied. Microhardness, compressive strength and density were shown to reduce after addition of Gd2O3. Obtained results prove the hypothesis on formation of stable pores in the system of UO2-Gd2O3 due to Kirkendall effect that reduces sintering efficiency. The paper expands fundamental knowledge on pros and cons of fuel fabrication with IFBA using SPS technology.
Trace radioactive impurities in final construction materials for EXO-200
Leonard, D.S.,Auty, D.J.,Didberidze, T.,Gornea, R.,Grinberg, P.,MacLellan, R.,Methven, B.,Piepke, A.,Vuilleumier, J.-L.,Albert, J.B.,Anton, G.,Badhrees, I.,Barbeau, P.S.,Bayerlein, R.,Beck, D.,Belov, Elsevier 2017 Nuclear instruments & methods in physics research. Vol.871 No.-
<P><B>Abstract</B></P> <P>We report results from a systematic measurement campaign conducted to identify low radioactivity materials for the construction of the EXO-200 double beta decay experiment. Partial results from this campaign have already been reported in a 2008 paper by the EXO collaboration. Here we release the remaining data, collected since 2007, to the public. The data reported were obtained using a variety of analytic techniques. The measurement sensitivities are among the best in the field. Construction of the EXO-200 detector has been concluded, and Phase-I data was taken from 2011 to 2014. The detector’s extremely low background implicitly verifies the measurements and the analysis assumptions made during construction and reported in this paper.</P>
ACTIVATION ANALYSIS OF ENVIRONMENTAL SAMPLES USING THE MT-25 MICROTRON OF THE FLNR
Maslov, O.D.,Belov, A.G.,Starodub, G.Ya.,Dmitriev, S.N. The Korean Society of Analytical Sciences 1995 분석과학 Vol.8 No.4
Instrumental neutron and gamma activation analysis of coal and combustion products, determination of platinum content in natural samples by radiochemical gamma activation analysis and high-sensitive track method of thorium determination has been studied with the use of the MT-25 microtron.The optimal conditions for complete elemental analysis of coal and combustion products, isolation and determination of platinum and thorium are recommended.
Sensitivity and discovery potential of the proposed nEXO experiment to neutrinoless double- β decay
Albert, J. B.,Anton, G.,Arnquist, I. J.,Badhrees, I.,Barbeau, P.,Beck, D.,Belov, V.,Bourque, F.,Brodsky, J. P.,Brown, E.,Brunner, T.,Burenkov, A.,Cao, G. F.,Cao, L.,Cen, W. R.,Chambers, C.,Charlebois, American Physical Society 2018 Physical Review C Vol.97 No.6
Search for nucleon decays with EXO-200
Albert, J. B.,Anton, G.,Badhrees, I.,Barbeau, P. S.,Bayerlein, R.,Beck, D.,Belov, V.,Breidenbach, M.,Brunner, T.,Cao, G. F.,Cen, W. R.,Chambers, C.,Cleveland, B.,Coon, M.,Craycraft, A.,Cree, W.,Daniel American Physical Society 2018 Physical Review D Vol.97 No.7
Search for Neutrinoless Double-Beta Decay with the Upgraded EXO-200 Detector
Albert, J. B.,Anton, G.,Badhrees, I.,Barbeau, P. S.,Bayerlein, R.,Beck, D.,Belov, V.,Breidenbach, M.,Brunner, T.,Cao, G. F.,Cen, W. R.,Chambers, C.,Cleveland, B.,Coon, M.,Craycraft, A.,Cree, W.,Daniel American Physical Society 2018 Physical Review Letters Vol.120 No.7