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Search Results: 1 - 10 of 87729 matches for " I. Ostrovskiy "
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Morphometrical Substantiation of Surgical Method Choice of Damage Correction of Chest Department of Spinal Column
E.A. Anisimova,V.N. Nikolenko,V.V. Ostrovskiy,A.I. Toma
Saratov Journal of Medical Scientific Research , 2009,
Abstract: The purpose is to reveal patterns of variability of thoracic vertebrae size characteristics for adequate selection of standard sizes and orientation of corrective hardware introduction. Materials include preparations of vertebrae of 60 skeletons from the collection of Department of Human Anatomy, Saratov State Medical University and 110 computer tomograms in adults without visible backbone pathology, 200 computer tomograms of backbone traumas from archives at Saratov Scientific Research Institute of Traumatology and Orthopedics. The analysis of results of surgical treatment of 288 patients with backbone damages have been carried out from 1995 till 2008. Since 2003 preoperative planning at 160 patients has been done taking into account anatomo-topographic vertebrae sizes. Optimum selection of ventral designs has been carried out taking into account the sizes of vertebral bodies (front, back, lateral heights, sagittal and frontal diameters of vertebral bodies). It is necessary to consider the sizes of back structures (thickness and height of arches, pediculo-regional length, height, width, corners of convergence and inclination of pedicles of vertebrae).
Solid state breakdown counter for magnetic monopole and other highly ionizing particles searches
Igor Ostrovskiy,James Pinfold
Physics , 2014,
Abstract: Solid state breakdown counters combine threshold properties of nuclear track detectors with the convenience of electronic event registration in real time. Here we discuss the principle of operation of the breakdown counters and their potential applicability to the existing (MoEDAL) and foreseen (CosmicMoEDAL) searches of magnetic monopoles and other highly ionizing rare particles. Avenues of R\&D that may lead to an increased appeal of the technology are also described
Characterization of Silicon Photomultipliers for nEXO
I. Ostrovskiy,F. Retiere,D. Auty,J. Dalmasson,T. Didberidze,R. DeVoe,G. Gratta,L. Huth,L. James,L. Lupin-Jimenez,N. Ohmert,A. Piepke
Physics , 2015, DOI: 10.1109/TNS.2015.2453932
Abstract: Silicon Photomultipliers (SiPMs) are attractive candidates for light detectors for next generation liquid xenon double-beta decay experiments, like nEXO. In this paper we discuss the requirements that the SiPMs must satisfy in order to be suitable for nEXO and similar experiments, describe the two test setups operated by the nEXO collaboration, and present the results of characterization of SiPMs from several vendors. In particular, we find that the photon detection efficiency at the peak of xenon scintillation light emission (175-178 nm) approaches the nEXO requirements for tested FBK and Hamamatsu devices. Additionally, the nEXO collaboration performed radioassay of several grams of bare FBK devices using neutron activation analysis, indicating levels of 40K, 232Th, and 238U of the order of <0.15, (6.9e10-4 - 1.3e10-2), and <0.11 mBq/kg, respectively.
RESEARCH OF THE TEAMWORK OF WATER AND AIR ENVIRONMENT IN THE CONSTRUCTION OF THE AEROHYDRAULIC WATER LIFT Исследование совместной работы водной и воздушной среды в конструкции аэрогидравлического водоподъемника
Kizyun Z. V.,Ostrovskiy N. V.
Polythematic Online Scientific Journal of Kuban State Agrarian University , 2013,
Abstract: In the article, we present the experimental model allowing defining physic and mechanical characteristics of the air at the aerohydraulic water lift. Data of the air compression with the hydraulic compression effect were obtained and compared with calculation sizes. Possibility and efficiency of use of water-air pressure system were estimated
A C-13(alpha,n)O-16 calibration source for KamLAND
David W. McKee,Jerome K. Busenitz,Igor Ostrovskiy
Physics , 2007, DOI: 10.1016/j.nima.2007.12.002
Abstract: We report on the construction and performance of a calibration source for KamLAND using the reaction C-13(alpha,n)O-16 with Po-210 as the alpha progenitor. The source provides a direct measurement of this background reaction in our detector, high energy calibration points for the detector energy scale, and data on quenching of the neutron visible energy in KamLAND scintillator. We also discuss the possibility of using the reaction C-13(alpha,n)O-16 as a source of tagged slow neutrons.
Experience of surgical treatment of unstable СII vertebral fractures
V.V. Ostrovskiy,V.G. Ninel,A.E. Shulga,A.A. Smoljkin
Saratov Journal of Medical Scientific Research , 2010,
Abstract: CII arch fractures are divided into groups according not to anatomical localization, but to the instability degree resulted from the trauma. Effendi et al classification became greatly widespread. |t is based on the same stability criteria, but it is simpler, intelligible and gives the plan of treatment. All the fractures according to this classification are divided into three types: the first one consists in stable fractures in which even in functional images there is no any rough deformation at the level of CII segment; the second one consists in damages with significant angular (more than 11°) or shift (more than 3,5 mm) deformations, that indirectly indicates damage of soft tissue structures, and first of all diskoligamentous complex. The services of the authors of the present classification are also that they were the first who had defined fracture-dislocation of CII arch, attributed it to the third type. Choice of surgical procedure in unstable CII-III vertebral fractures is ventral spondylosyndesis of CII-III carried out by submaxillary approach after the preliminary closed elimination of deformation of upper cervical part of spine. The differentiated approach to the implant choice with an allowance for morphometric data allows to receive adequate decompression of nervous - vascular structures and reliable stabilization of the damaged segment
Search for Neutrinoless Double-Beta Decay in $^{136}$Xe with EXO-200
M. Auger,D. J. Auty,P. S. Barbeau,E. Beauchamp,V. Belov,C. Benitez-Medina,M. Breidenbach,T. Brunner,A. Burenkov,B. Cleveland,S. Cook,T. Daniels,M. Danilov,C. G. Davis,S. Delaquis,R. deVoe,A. Dobi,M. J. Dolinski,A. Dolgolenko,M. Dunford,W. Fairbank Jr.,J. Farine,W. Feldmeier,P. Fierlinger,D. Franco,G. Giroux,R. Gornea,K. Graham,G. Gratta,C. Hall,K. Hall,C. Hargrove,S. Herrin,M. Hughes,A. Johnson,T. N. Johnson,A. Karelin,L. J. Kaufman,A. Kuchenkov,K. S. Kumar,D. S. Leonard,F. Leonard,D. Mackay,R. MacLellan,M. Marino,B. Mong,M. Montero Diez,A. R. Muller,R. Neilson,R. Nelson,A. Odian,I. Ostrovskiy,K. O'Sullivan,C. Ouellet,A. Piepke,A. Pocar,C. Y. Prescott,K. Pushkin,P. C. Rowson,J. J. Russell,A. Sabourov,D. Sinclair,S. Slutsky,V. Stekhanov,T. Tolba,D. Tosi,K. Twelker,P. Vogel,J. -L. Vuilleumier,A. Waite,T. Walton,M. Weber,U. Wichoski,J. Wodin,J. D. Wright,L. Yang,Y. -R. Yen,O. Ya. Zeldovich
Physics , 2012, DOI: 10.1103/PhysRevLett.109.032505
Abstract: We report on a search for neutrinoless double-beta decay of $^{136}$Xe with EXO-200. No signal is observed for an exposure of 32.5 kg-yr, with a background of ~1.5 x 10^{-3} /(kg yr keV) in the $\pm 1\sigma$ region of interest. This sets a lower limit on the half-life of the neutrinoless double-beta decay $T_{1/2}^{0\nu\beta\beta}$($^{136}$Xe) > 1.6 x 10$^{25}$ yr (90% CL), corresponding to effective Majorana masses of less than 140-380 meV, depending on the matrix element calculation.
Spectroscopy of Ba and Ba$^+$ deposits in solid xenon for barium tagging in nEXO
B. Mong,S. Cook,T. Walton,C. Chambers,A. Craycraft,C. Benitez-Medina,K. Hall,W. Fairbank Jr.,J. B. Albert,D. J. Auty,P. S. Barbeau,V. Basque,D. Beck,M. Breidenbach,T. Brunner,G. F. Cao,B. Cleveland,M. Coon,T. Daniels,S. J. Daugherty,R. DeVoe,T. Didberidze,J. Dilling,M. J. Dolinski,M. Dunford,L. Fabris,J. Farine,W. Feldmeier,P. Fierlinger,D. Fudenberg,G. Giroux,R. Gornea,K. Graham,G. Gratta,M. Heffner,M. Hughes,X. S. Jiang,T. N. Johnson,S. Johnston,A. Karelin,L. J. Kaufman,R. Killick,T. Koffas,S. Kravitz,R. Krucken,A. Kuchenkov,K. S. Kumar,D. S. Leonard,C. Licciardi,Y. H. Lin,J. Ling,R. MacLellan,M. G. Marino,D. Moore,A. Odian,I. Ostrovskiy,A. Piepke,A. Pocar,F. Retiere,P. C. Rowson,M. P. Rozo,A. Schubert,D. Sinclair,E. Smith,V. Stekhanov,M. Tarka,T. Tolba,K. Twelker,J. -L. Vuilleumier,J. Walton,M. Weber,L. J. Wen,U. Wichoski,L. Yang,Y. -R. Yen,Y. B. Zhao
Physics , 2014, DOI: 10.1103/PhysRevA.91.022505
Abstract: Progress on a method of barium tagging for the nEXO double beta decay experiment is reported. Absorption and emission spectra for deposits of barium atoms and ions in solid xenon matrices are presented. Excitation spectra for prominent emission lines, temperature dependence and bleaching of the fluorescence reveal the existence of different matrix sites. A regular series of sharp lines observed in Ba$^+$ deposits is identified with some type of barium hydride molecule. Lower limits for the fluorescence quantum efficiency of the principal Ba emission transition are reported. Under current conditions, an image of $\le10^4$ Ba atoms can be obtained. Prospects for imaging single Ba atoms in solid xenon are discussed.
Investigation of radioactivity-induced backgrounds in EXO-200
J. B. Albert,D. J. Auty,P. S. Barbeau,D. Beck,V. Belov,C. Benitez-Medina,M. Breidenbach,T. Brunner,A. Burenkov,G. F. Cao,C. Chambers,B. Cleveland,M. Coon,A. Craycraft,T. Daniels,M. Danilov,S. J. Daugherty,C. G. Davis,J. Davis,S. Delaquis,A. Der Mesrobian-Kabakian,R. DeVoe,T. Didberidze,A. Dolgolenko,M. J. Dolinski,M. Dunford,W. Fairbank Jr.,J. Farine,W. Feldmeier,P. Fierlinger,D. Fudenberg,G. Giroux,R. Gornea,K. Graham,G. Gratta,C. Hall,S. Herrin,M. Hughes,M. J. Jewell,X. S. Jiang,A. Johnson,T. N. Johnson,S. Johnston,A. Karelin,L. J. Kaufman,R. Killick,T. Koffas,S. Kravitz,A. Kuchenkov,K. S. Kumar,D. S. Leonard,C. Licciardi,Y. H. Lin,J. Ling,R. MacLellan,M. G. Marino,B. Mong,D. Moore,R. Nelson,A. Odian,I. Ostrovskiy,A. Piepke,A. Pocar,C. Y. Prescott,A. Rivas,P. C. Rowson,J. J. Russell,A. Schubert,D. Sinclair,E. Smith,V. Stekhanov,M. Tarka,T. Tolba,R. Tsang,K. Twelker,J. -L. Vuilleumier,A. Waite,J. Walton,T. Walton,M. Weber,L. J. Wen,U. Wichoski,J. Wood,L. Yang,Y. -R. Yen,O. Ya. Zeldovich
Physics , 2015, DOI: 10.1103/PhysRevC.92.015503}
Abstract: The search for neutrinoless double-beta decay (0{\nu}{\beta}{\beta}) requires extremely low background and a good understanding of their sources and their influence on the rate in the region of parameter space relevant to the 0{\nu}{\beta}{\beta} signal. We report on studies of various {\beta}- and {\gamma}-backgrounds in the liquid- xenon-based EXO-200 0{\nu}{\beta}{\beta} experiment. With this work we try to better understand the location and strength of specific background sources and compare the conclusions to radioassay results taken before and during detector construction. Finally, we discuss the implications of these studies for EXO-200 as well as for the next-generation, tonne-scale nEXO detector.
Search for Majorana neutrinos with the first two years of EXO-200 data
EXO-200 Collaboration,:,J. B. Albert,D. J. Auty,P. S. Barbeau,E. Beauchamp,D. Beck,V. Belov,C. Benitez-Medina,J. Bonatt,M. Breidenbach,T. Brunner,A. Burenkov,G. F. Cao,C. Chambers,J. Chaves,B. Cleveland,M. Coon,A. Craycraft,T. Daniels,M. Danilov,S. J. Daugherty,C. G. Davis,J. Davis,R. DeVoe,S. Delaquis,T. Didberidze,A. Dolgolenko,M. J. Dolinski,M. Dunford,W. Fairbank Jr.,J. Farine,W. Feldmeier,P. Fierlinger,D. Fudenberg,G. Giroux,R. Gornea,K. Graham,G. Gratta,C. Hall,S. Herrin,M. Hughes,M. J. Jewell,X. S. Jiang,A. Johnson,T. N. Johnson,S. Johnston,A. Karelin,L. J. Kaufman,R. Killick,T. Koffas,S. Kravitz,A. Kuchenkov,K. S. Kumar,D. S. Leonard,F. Leonard,C. Licciardi,Y. H. Lin,R. MacLellan,M. G. Marino,B. Mong,D. Moore,R. Nelson,A. Odian,I. Ostrovskiy,C. Ouellet,A. Piepke,A. Pocar,C. Y. Prescott,A. Rivas,P. C. Rowson,M. P. Rozo,J. J. Russell,A. Schubert,D. Sinclair,S. Slutsky,E. Smith,V. Stekhanov,M. Tarka,T. Tolba,D. Tosi,K. Twelker,P. Vogel,J. -L. Vuilleumier,A. Waite,J. Walton,T. Walton,M. Weber,L. J. Wen,U. Wichoski,J. D. Wright,L. Yang,Y. -R. Yen,O. Ya. Zeldovich,Y. B. Zhao
Physics , 2014, DOI: 10.1038/nature13432
Abstract: Many extensions of the Standard Model of particle physics suggest that neutrinos should be Majorana-type fermions, but this assumption is difficult to confirm. Observation of neutrinoless double-beta decay ($0\nu \beta \beta$), a spontaneous transition that may occur in several candidate nuclei, would verify the Majorana nature of the neutrino and constrain the absolute scale of the neutrino mass spectrum. Recent searches carried out with $^{76}$Ge (GERDA experiment) and $^{136}$Xe (KamLAND-Zen and EXO-200 experiments) have established the lifetime of this decay to be longer than $10^{25}$ yr, corresponding to a limit on the neutrino mass of 0.2-0.4 eV. Here we report new results from EXO-200 based on 100 kg$\cdot$yr of $^{136}$Xe exposure, representing an almost fourfold increase from our earlier published datasets. We have improved the detector resolution at the $^{136}$Xe double-beta-decay Q-value to $\sigma$/E = 1.53% and revised the data analysis. The obtained half-life sensitivity is $1.9\cdot10^{25}$ yr, an improvement by a factor of 2.7 compared to previous EXO-200 results. We find no statistically significant evidence for $0\nu \beta \beta$ decay and set a half-life limit of $1.1\cdot10^{25}$ yr at 90% CL. The high sensitivity holds promise for further running of the EXO-200 detector and future $0\nu \beta \beta$ decay searches with nEXO.
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