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Search Results: 1 - 10 of 297491 matches for " J. Janicsko Csathy "
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Electron/pion separation with an Emulsion Cloud Chamber by using a Neural Network
L. Arrabito,D. Autiero,C. Bozza,S. Buontempo,Y. Caffari,L. Consiglio,M. Cozzi,N. D'Ambrosio,G. De Lellis,M. De Serio,F. Di Capua,D. Di Ferdinando,N. Di Marco,A. Ereditato,L. S. Esposito,S. Gagnebin,G. Giacomelli,M. Giorgini,G. Grella,M. Hauger,M. Ieva,J. Janicsko Csathy,F. Juget,I. Kreslo,I. Laktineh,A. Longhin,G. Mandrioli,A. Marotta,J. Marteau,P. Migliozzi,P. Monacelli,U. Moser,M. T. Muciaccia,A. Pastore,L. Patrizii,C. Pistillo,M. Pozzato,G. Romano,G. Rosa,A. Russo,N. Savvinov,A. Schembri,L. Scotto Lavina,S. Simone,M. Sioli,C. Sirignano,G. Sirri,P. Strolin,V. Tioukov
Physics , 2007, DOI: 10.1088/1748-0221/2/02/P02001
Abstract: We have studied the performance of a new algorithm for electron/pion separation in an Emulsion Cloud Chamber (ECC) made of lead and nuclear emulsion films. The software for separation consists of two parts: a shower reconstruction algorithm and a Neural Network that assigns to each reconstructed shower the probability to be an electron or a pion. The performance has been studied for the ECC of the OPERA experiment [1]. The $e/\pi$ separation algorithm has been optimized by using a detailed Monte Carlo simulation of the ECC and tested on real data taken at CERN (pion beams) and at DESY (electron beams). The algorithm allows to achieve a 90% electron identification efficiency with a pion misidentification smaller than 1% for energies higher than 2 GeV.
Track reconstruction in the emulsion-lead target of the OPERA experiment using the ESS microscope
L. Arrabito,C. Bozza,S. Buontempo,L. Consiglio,M. Cozzi,N. D'Ambrosio,G. De Lellis,M. De Serio,F. Di Capua,D. Di Ferdinando,N. Di Marco,A. Ereditato,L. S. Esposito,R. A. Fini,G. Giacomelli,M. Giorgini,G. Grella,M. Ieva,J. Janicsko Csathy,F. Juget,I. Kreslo,I. Laktineh,K. Manai,G. Mandrioli,A. Marotta,P. Migliozzi,P. Monacelli,U. Moser,M. T. Muciaccia,A. Pastore,L. Patrizii,Y. Petukhov,C. Pistillo,M. Pozzato,G. Romano,G. Rosa,A. Russo,N. Savvinov,A. Schembri,L. Scotto Lavina,S. Simone,M. Sioli,C. Sirignano,G. Sirri,P. Strolin,V. Tioukov,T. Waelchli
Physics , 2007, DOI: 10.1088/1748-0221/2/05/P05004
Abstract: The OPERA experiment, designed to conclusively prove the existence of $\rm \nu_\mu \to \nu_\tau$ oscillations in the atmospheric sector, makes use of a massive lead-nuclear emulsion target to observe the appearance of $\rm \nu_\tau$'s in the CNGS $\rm \nu_\mu$ beam. The location and analysis of the neutrino interactions in quasi real-time required the development of fast computer-controlled microscopes able to reconstruct particle tracks with sub-micron precision and high efficiency at a speed of 20 cm^2 / h. This paper describes the performance in particle track reconstruction of the European Scanning System, a novel automatic microscope for the measurement of emulsion films developed for OPERA.
Production, characterization and operation of $^{76}$Ge enriched BEGe detectors in GERDA
M. Agostini,M. Allardt,E. Andreotti,A. M. Bakalyarov,M. Balata,I. Barabanov,N. Barros,L. Baudis,C. Bauer,N. Becerici-Schmidt,E. Bellotti,S. Belogurov,S. T. Belyaev,G. Benato,A. Bettini,L. Bezrukov,T. Bode,D. Borowicz,V. Brudanin,R. Brugnera,D. Budjas,A. Caldwel,C. Cattadori,A. Chernogorov,V. D'Andrea,E. V. Demidova,A. Domula,V. Egorov,R. Falkenstein,K. Freund,N. Frodyma,A. Gangapshev,A. Garfagnini,C. Gotti,P. Grabmayr,V. Gurentsov,K. Gusev,W. Hampel,A. Hegai,M. Heisel,S. Hemmer,G. Heusser,W. Hofmann,M. Hult,L. V. Inzhechik,L. Ioannucci,J. Janicsko Csathy,J. Jochum,M. Junker,V. Kazalov,T. Kihm,I. V. Kirpichnikov,A. Kirsch,A. Klimenko,K. T. Kn?pfle,O. Kochetov,V. N. Kornoukhov,V. V. Kuzminov,M. Laubenstein,A. Lazzaro,V. I. Lebedev,B. Lehnert,H. Y. Liao,M. Lindner,I. Lippi,A. Lubashevskiy,B. Lubsandorzhiev,G. Lutter,C. Macolino,B. Majorovits,W. Maneschg,M. Misiaszek,I. Nemchenok,S. Nisi,C. O'Shaughnessy,D. Palioselitis,L. Pandola,K. Pelczar,G. Pessina,A. Pullia,S. Riboldi,N. Rumyantseva,C. Sada,M. Salathe,C. Schmitt,J. Schreiner,O. Schulz,B. Schwingenheuer,S. Sch?nert,E. Shevchik,M. Shirchenko,H. Simgen,A. Smolnikov,L. Stanco,H. Strecker,C. A. Ur,L. Vanhoefer,A. A. Vasenko,K. von Sturm,V. Wagner,M. Walter,A. Wegmann,T. Wester,H. Wilsenach,M. Wojcik,E. Yanovich,P. Zavarise,I. Zhitnikov,S. V. Zhukov,D. Zinatulina,K. Zuber,G. Zuzel
Physics , 2014, DOI: 10.1140/epjc/s10052-014-3253-0
Abstract: The GERmanium Detector Array (GERDA) at the Gran Sasso Underground Laboratory (LNGS) searches for the neutrinoless double beta decay (0{\nu}{\beta}{\beta}) of $^{76}$Ge. Germanium detectors made of material with an enriched $^{76}$Ge fraction act simultaneously as sources and detectors for this decay. During Phase I of the experiment mainly refurbished semi-coaxial Ge detectors from former experiments were used. For the upcoming Phase II, 30 new $^{76}$Ge enriched detectors of broad energy germanium (BEGe)-type were produced. A subgroup of these detectors has already been deployed in GERDA during Phase I. The present paper reviews the complete production chain of these BEGe detectors including isotopic enrichment, purification, crystal growth and diode production. The efforts in optimizing the mass yield and in minimizing the exposure of the $^{76}$Ge enriched germanium to cosmic radiation during processing are described. Furthermore, characterization measurements in vacuum cryostats of the first subgroup of seven BEGe detectors and their long-term behavior in liquid argon are discussed. The detector performance fulfills the requirements needed for the physics goals of GERDA Phase~II.
Measurement of the half-life of the two-neutrino double beta decay of Ge-76 with the Gerda experiment
GERDA Collaboration,M. Agostini,M. Allardt,E. Andreotti,A. M. Bakalyarov,M. Balata,I. Barabanov,M. Barnabe Heider,N. Barros,L. Baudis,C. Bauer,N. Becerici-Schmidt,E. Bellotti,S. Belogurov,S. T. Belyaev,G. Benato,A. Bettini,L. Bezrukov,T. Bode,V. Brudanin,R. Brugnera,D. Budjas,A. Caldwell,C. Cattadori,A. Chernogorov,F. Cossavella,E. V. Demidova,A. Denisov,A. Domula,V. Egorov,R. Falkenstein,A. D. Ferella,K. Freund,F. Froborg,N. Frodyma,A. Gangapshev,A. Garfagnini,S. Gazzana,P. Grambayr,V. Gurentsov,K. Gusev,K. K. Guthikonda,W. Hampel,A. Hegai,M. Heisel,S. Hemmer,G. Heusser,W. Hofmann,M. Hult,L. V. Inzhechik,L. Ioannucci,J. Janicsko Csathy,J. Jochum,M. Junker,S. Kianovsky,I. V. Kirpichnikov,A. Kirsch,A. Klimenko,K. T. Knoepfle,O. Kochetov,V. N. Kornoukhov,V. Kusminov,M. Laubenstein,A. Lazzaro,V. I. Lebedev,B. Lehnert,H. Y. Liao,M. Lindner,I. Lippi,X. Liu,A. Lubashevskiy,B. Lubsandorzhiev,G. Lutter,A. A. Machado,B. Majorovits,W. Maneschg,I. Nemchenok,S. Nisi,C. O'Shaughnessy,L. Pandola,K. Pelczar,L. Peraro,A. Pullia,S. Riboldi,F. Ritter,C. Sada,M. Salathe,C. Schmitt,S. Schoenert,J. Schreiner,O. Schulz,B. Schwingenheuer,E. Shevchik,M. Shirchenko,H. Simgen,A. Smolnikov,L. Stanco,H. Strecker,M. Tarka,C. A. Ur,A. A. Vasenko,O. Volynets,K. von Sturm,M. Walter,A. Wegmann,M. Wojcik,E. Yanovich,P. Zavarise,I. Zhitnikov,S. V. Zhukov,D. Zinatulina,K. Zuber,G. Zuzel
Physics , 2012, DOI: 10.1088/0954-3899/40/3/035110
Abstract: The primary goal of the GERmanium Detector Array (Gerda) experiment at the Laboratori Nazionali del Gran Sasso of INFN is the search for the neutrinoless double beta decay of Ge-76. High-purity germanium detectors made from material enriched in Ge-76 are operated directly immersed in liquid argon, allowing for a substantial reduction of the background with respect to predecessor experiments. The first 5.04 kg yr of data collected in Phase I of the experiment have been analyzed to measure the half-life of the neutrino-accompanied double beta decay of Ge-76. The observed spectrum in the energy range between 600 and 1800 keV is dominated by the double beta decay of Ge-76. The half-life extracted from Gerda data is T(1/2) = (1.84 +0.14 -0.10) 10^{21} yr.
The background in the neutrinoless double beta decay experiment GERDA
The GERDA collaboration,M. Agostini,M. Allardt,E. Andreotti,A. M. Bakalyarov,M. Balata,I. Barabanov,M. Barnabe Heider,N. Barros,L. Baudis,C. Bauer,N. Becerici-Schmidt,E. Bellotti,S. Belogurov,S. T. Belyaev,G. Benato,A. Bettini,L. Bezrukov,T. Bode,V. Brudanin,R. Brugnera,D. Budjas,A. Caldwell,C. Cattadori,A. Chernogorov,F. Cossavella,E. V. Demidova,A. Domula,V. Egorov,R. Falkenstein,A. Ferella,K. Freund,N. Frodyma,A. Gangapshev,A. Garfagnini,C. Gotti,P. Grabmayr,V. Gurentsov,K. Gusev,K. K. Guthikonda,W. Hampel,A. Hegai,M. Heisel,S. Hemmer,G. Heusser,W. Hofmann,M. Hult,L. V. Inzhechik,L. Ioannucci,J. Janicsko Csathy,J. Jochum,M. Junker,T. Kihm,I. V. Kirpichnikov,A. Kirsch,A. Klimenko,K. T. Knoepfle,O. Kochetov,V. N. Kornoukhov,V. V. Kuzminov,M. Laubenstein,A. Lazzaro,V. I. Lebedev,B. Lehnert,H. Y. Liao,M. Lindner,I. Lippi,X. Liu,A. Lubashevskiy,B. Lubsandorzhiev,G. Lutter,C. Macolino,A. A. Machado,B. Majorovits,W. Maneschg,I. Nemchenok,S. Nisi,C. O'Shaughnessy,D. Palioselitis,L. Pandola,K. Pelczar,G. Pessina,A. Pullia,S. Riboldi,C. Sada,M. Salathe,C. Schmitt,J. Schreiner,O. Schulz,B. Schwingenheuer,S. Schoenert,E. Shevchik,M. Shirchenko,H. Simgen,A. Smolnikov,L. Stanco,H. Strecker,M. Tarka,C. A. Ur,A. A. Vasenko,O. Volynets,K. von Sturm,V. Wagner,M. Walter,A. Wegmann,T. Wester,M. Wojcik,E. Yanovich,P. Zavarise,I. Zhitnikov,S. V. Zhukov,D. Zinatulina,K. Zuber,G. Zuzel
Physics , 2013, DOI: 10.1140/epjc/s10052-014-2764-z
Abstract: The GERmanium Detector Array (GERDA) experiment at the Gran Sasso underground laboratory (LNGS) of INFN is searching for neutrinoless double beta decay of 76Ge. The signature of the signal is a monoenergetic peak at 2039 keV, the Q-value of the decay, Q_bb. To avoid bias in the signal search, the present analysis does not consider all those events, that fall in a 40 keV wide region centered around Q_bb. The main parameters needed for the neutrinoless double beta decay analysis are described. A background model was developed to describe the observed energy spectrum. The model contains several contributions, that are expected on the basis of material screening or that are established by the observation of characteristic structures in the energy spectrum. The model predicts a flat energy spectrum for the blinding window around Q_bb with a background index ranging from 17.6 to 23.8*10^{-3} counts/(keV kg yr). A part of the data not considered before has been used to test if the predictions of the background model are consistent. The observed number of events in this energy region is consistent with the background model. The background at Q-bb is dominated by close sources, mainly due to 42K, 214Bi, 228Th, 60Co and alpha emitting isotopes from the 226Ra decay chain. The individual fractions depend on the assumed locations of the contaminants. It is shown, that after removal of the known gamma peaks, the energy spectrum can be fitted in an energy range of 200 kev around Q_bb with a constant background. This gives a background index consistent with the full model and uncertainties of the same size.
Particle-hole Asymmetry of Fractional Quantum Hall States in the Second Landau Level of a Two-dimensional Hole System
A. Kumar,N. Samkharadze,M. J. Manfra,G. A. Csathy,L. N. Pfeiffer,K. W. West
Physics , 2010, DOI: 10.1103/PhysRevB.83.201305
Abstract: We report the first unambiguous observation of a fractional quantum Hall state in the Landau level of a two-dimensional hole sample at the filling factor $\nu=8/3$. We identified this state by a quantized Hall resistance and an activated temperature dependence of the longitudinal resistance and found an energy gap of 40 mK. To our surprise the particle-hole conjugate state at filling factor $\nu=7/3$ in our sample does not develop down to 6.9 mK. This observation is contrary to that in electron samples in which the 7/3 state is typically more stable than the 8/3 state. We present evidence that the asymmetry between the 7/3 and 8/3 states in our hole sample is due to Landau level mixing.
Integrated Electronic Transport and Thermometry at milliKelvin Temperatures and in Strong Magnetic Fields
N. Samkharadze,A. Kumar,M. J. Manfra,L. N. Pfeiffer,K. W. West,G. A. Csathy
Physics , 2011, DOI: 10.1063/1.3586766
Abstract: We fabricated a He-3 immersion cell for transport measurements of semiconductor nanostructures at ultra low temperatures and in strong magnetic fields. We have a new scheme of field-independent thermometry based on quartz tuning fork Helium-3 viscometry which monitors the local temperature of the sample's environment in real time. The operation and measurement circuitry of the quartz viscometer is described in detail. We provide evidence that the temperature of two-dimensional electron gas confined to a GaAs quantum well follows the temperature of the quartz viscometer down to 4mK.
A Transimpedance Amplifier for Remotely Located Quartz Tuning Forks
Ethan Kleinbaum,Gabor Csathy
Physics , 2012, DOI: 10.1063/1.4769271
Abstract: The cable capacitance in cryogenic and high vacuum applications of quartz tuning forks imposes severe constraints on the bandwidth and noise performance of the measurement. We present a single stage low noise transimpedance amplifier with a bandwidth exceeding 1 MHz and provide an in-depth analysis of the dependence of the amplifier parameters on the cable capacitance.
Vitamin D deficiency in undifferentiated connective tissue disease
Eva Zold, Peter Szodoray, Janos Gaal, János Kappelmayer, Laszlo Csathy, Edit Gyimesi, Margit Zeher, Gyula Szegedi, Edit Bodolay
Arthritis Research & Therapy , 2008, DOI: 10.1186/ar2533
Abstract: Plasma 25(OH)D3 levels in 161 UCTD patients were measured in both summer and winter periods. Autoantibody profiles (antinuclear antibody, anti-U1-ribonucleoprotein, anti-SSA, anti-SSB, anti-Jo1, anti-Scl70, anti-double-stranded DNA, anti-centromere, anti-cardiolipin, rheumatoid factor, and anti-cyclic citrullinated peptide) and clinical symptoms of the patients were assessed.Plasma levels of 25(OH)D3 in UCTD patients were significantly lower compared with controls in both summer and winter periods (UCTD summer: 33 ± 13.4 ng/mL versus control: 39.9 ± 11.7 ng/mL, P = 0.01; UCTD winter: 27.8 ± 12.48 ng/mL versus control: 37.8 ± 12.3 ng/mL, P = 0.0001). The presence of dermatological symptoms (photosensitivity, erythema, and chronic discoid rash) and pleuritis was associated with low levels of vitamin D. During the average follow-up period of 2.3 years, 35 out of 161 patients (21.7%) with UCTD further developed into well-established connective tissue disease (CTD). Patients who progressed into CTDs had lower vitamin D levels than those who remained in the UCTD stage (vitamin D levels: CTD: 14.7 ± 6.45 ng/mL versus UCTD: 33.0 ± 13.4 ng/mL, P = 0.0001).In patients with UCTD, a seasonal variance in levels of 25(OH)D3 was identified and showed that these levels were significantly lower than in controls during the corresponding seasons. Our results suggest that vitamin D deficiency in UCTD patients may play a role in the subsequent progression into well-defined CTDs.Environmental factors play an important role in the development and progression of systemic autoimmune diseases along with susceptible genetic and hormonal background. It has been suggested recently that vitamin D is an environmental factor that, by modulating the immune system, affects the prevalence of autoimmune syndromes. Thus, vitamin D deficiency may have a role in the pathogenesis of systemic autoimmune diseases.The classic and well-known function of vitamin D is to regulate mineral homeostasis and thus bo
Effect of strain on stripe phases in the Quantum Hall regime
Sunanda P. Koduvayur,Yuli Lyanda-Geller,Sergei Khlebnikov,Gabor Csathy,Michael J. Manfra,Loren N. Pfeiffer,Kenneth W. West,Leonid P. Rokhinson
Physics , 2010, DOI: 10.1103/PhysRevLett.106.016804
Abstract: Spontaneous breaking of rotational symmetry and preferential orientation of stripe phases in the quantum Hall regime has attracted considerable experimental and theoretical effort over the last decade. We demonstrate experimentally and theoretically that the direction of high and low resistance of the two-dimensional (2D) hole gas in the quantum Hall regime can be controlled by an external strain. Depending on the sign of the in-plane shear strain, the Hartree-Fock energy of holes or electrons is minimized when the charge density wave (CDW) is oriented along [110] or [1-10] directions. We suggest that shear strains due to internal electric fields in the growth direction are responsible for the observed orientation of CDW in pristine electron and hole samples.
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