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Search Results: 1 - 10 of 138813 matches for " K. Holeczek "
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Frequency dependence of the self-heating effect in polymer-based composites
A. Katunin,W. Hufenbach,P. Kostka,K. Holeczek
Journal of Achievements in Materials and Manufacturing Engineering , 2010,
Abstract: Purpose: The self-heating effect caused by viscous energy dissipation in polymer-based composite structures subjected to harmonic loads is considered to have a great influence on the residual life of the component. The purpose of the conducted investigations is the determination of the dynamic mechanical behaviour of a polymer-based composite material under different excitation frequencies and temperatures.Design/methodology/approach: The dynamic mechanical analysis was employed for measurements of temperature and frequency dependence of the complex rigidity parameters. Obtained loss rigidity curves for different load frequencies enable the determination of the glass-transition temperatures and finally frequency-dependence of the loss rigidity determined on the basis of the kinetic molecular theory and Williams-Landel-Ferry (WLF) hypothesis.Findings: The dependency between glass-transition temperature and excitation frequency has been investigated. The activation energy of the phase transition as well as the temperature dependence of the shift factor was calculated. The glass-transition temperature and constants of WLF equation enable the determination of temperature and frequency dependence of the loss rigidity according to the time-temperature superposition principle.Research limitations/implications: The ranges of temperatures were limited to 30-150 °C and excitation frequencies to 1-200 Hz, the behaviour of the composite material outside these ranges can be estimated based on the theoretical assumptions only. Obtained dependencies are correct only for linearly viscoelastic materials.Practical implications: Obtained dependencies can be useful for estimation of the mechanical and thermal degradation of polymer-based composites and can be subsequently applied for the determination of fatigue, crack growth and residual life of composite structures.Originality/value: The determination of temperature and frequency dependence of the loss rigidity gives an opportunity to obtain the self-heating temperature distribution of the polymer-based composite structures under harmonic loading.
Searching for New Physics in Future Neutrino Factory Experiments
Holeczek, J.;Kisiel, J.;Syska, J.;Zralek, M.
High Energy Physics - Phenomenology , 2007, DOI: 10.1140/epjc/s10052-007-0420-6
Abstract: An extension of the New Standard Model, by introducing a mixing of the low mass ``active'' neutrinos with heavy ones, or by any model with lepton flavor violation, is considered. This leads to non-orthogonal neutrino production and detection states and to modifications of neutrino oscillations in both, vacuum and matter. The possibility of the discovery of such effects in current and future neutrino oscillation experiments is discussed. First order approximation formulas for the flavor transition probabilities in constant density matter, for all experimentally available channels, are given. Numerical calculations of flavor transition probabilities for two sets of New Physics parameters describing a single ``effective'' heavy neutrino state, both satisfying present experimental constraints, have been performed. Two energy ranges and several baselines, assuming both the current ($\pm2\sigma$) and the expected in future ($\pm3%$) errors of the neutrino oscillation parameters are considered, keeping their present central values. It appears that the biggest potential of the discovery of the possible presence of any New Physics is pronounced in oscillation channels in which $\nu_{e}$, $\nu_{\bar{e}}$ are not involved at all, especially for two baselines, $L=3000 km$ and $L=7500 km$, which for other reasons are also called ``magic'' for future $Neutrino Factory$ experiments.
New Physics in Neutron Beta Decay
Jacek Holeczek,Michal Ochman,Elzbieta Stephan,Marek Zralek
Physics , 2013,
Abstract: Limits on parameters describing physics beyond the Standard Model are presented. The most general Lorentz invariant effective Hamiltonian at the quark-lepton level involving vector, scalar and tensor operators has been used. The fits have been done using the most precise and up to date experimental data for correlation coefficients measured in free neutron beta decay as well as the Fierz term measured in superallowed Fermi decays.
Physics Beyond Standard Model in Neutron Beta Decay
Jacek Holeczek,Michal Ochman,Elzbieta Stephan,Marek Zralek
Physics , 2012, DOI: 10.5506/APhysPolB.42.2493
Abstract: Limits from neutron beta decay on parameters describing physics beyond the Standard Model are presented. New Physics is described by the most general Lorentz invariant effective Hamiltonian involving vector, scalar and tensor operators and Standard Model fields only. Two-parameter fits to the decay parameters measured in free neutron beta decay have been done, in some cases indicating rather big dependence of the results on g_A/g_V ratio of nucleon form factors at zero four-momentum transfer.
Some conclusive considerations on the comparison of the ICARUS nu_mu to nu_e oscillation search with the MiniBooNE low-energy event excess
M. Antonello,B. Baibussinov,P. Benetti,F. Boffelli,A. Bubak,E. Calligarich,S. Centro,A. Cesana,K. Cieslik,D. B. Cline,A. G. Cocco,A. Dabrowska,A. Dermenev,A. Falcone,C. Farnese,A. Fava,A. Ferrari,D. Gibin,S. Gninenko,A. Guglielmi,M. Haranczyk,J. Holeczek,M. Kirsanov,J. Kisiel,I. Kochanek,J. Lagoda,S. Mania,A. Menegolli,G. Meng,C. Montanari,S. Otwinowski,P. Picchi,F. Pietropaolo,P. Plonski,A. Rappoldi,G. L. Raselli,M. Rossella,C. Rubbia,P. Sala,A. Scaramelli,F. Sergiampietri,D. Stefan,R. Sulej,M. Szarska,M. Terrani,M. Torti,F. Varanini,S. Ventura,C. Vignoli,H. Wang,X. Yang,A. Zalewska,A. Zani,K. Zaremba
Physics , 2015,
Abstract: A sensitive search for anomalous LSND-like nu_mu to nu_e oscillations has been performed by the ICARUS Collaboration exposing the T600 LAr-TPC to the CERN to Gran Sasso (CNGS) neutrino beam. The result is compatible with the absence of additional anomalous contributions giving a limit to oscillation probability of 3.4E-3 and 7.6E-3 at 90% and 99% confidence levels respectively showing a tension between these new limits and the low-energy event excess (200 < E_nu QE < 475 MeV) reported by MiniBooNE Collaboration. A more detailed comparison of the ICARUS data with the MiniBooNE low-energy excess has been performed, including the energy resolution as obtained from the official MiniBooNE data release. As a result the previously reported tension is confirmed at 90% C.L., suggesting an unexplained nature or an otherwise instrumental effect for the MiniBooNE low energy event excess
Azimuthal dependence of pion source radii in Pb+Au collisions at 158 A GeV
CERES Collaboration,D. Adamova,G. Agakichiev,A. Andronic,D. Antonczyk,H. Appelshaeuser,V. Belaga,J. Bielcikova,P. Braun-Munzinger,O. Busch,A. Cherlin,S. Damjanovic,T. Dietel,L. Dietrich,A. Drees,W. Dubitzky,S. I. Esumi,K. Filimonov,K. Fomenko,Z. Fraenkel,C. Garabatos,P. Glaessel,G. Hering,J. Holeczek,M. Kalisky,S. Kniege,V. Kushpil,A. Maas,A. Marin,J. Milosevic,D. Miskowiec,R. Ortega,Y. Panebrattsev,O. Petchenova,V. Petracek,M. Ploskon,S. Radomski,J. Rak,I. Ravinovich,P. Rehak,H. Sako,W. Schmitz,S. Schuchmann,J. Schukraft,S. Sedykh,S. Shimansky,R. Soualah,J. Stachel,M. Sumbera,H. Tilsner,I. Tserruya,G. Tsiledakis,J. P. Wessels,T. Wienold,J. P. Wurm,S. Yurevich,V. Yurevich
Physics , 2008, DOI: 10.1103/PhysRevC.78.064901
Abstract: We present results of a two-pion correlation analysis performed with the Au+Pb collision data collected by the upgraded CERES experiment in the fall of 2000. The analysis was done in bins of the reaction centrality and the pion azimuthal emission angle with respect to the reaction plane. The pion source, deduced from the data, is slightly elongated in the direction perpendicular to the reaction plane, similarly as was observed at the AGS and at RHIC.
Underground operation of the ICARUS T600 LAr-TPC: first results
C. Rubbia,M. Antonello,P. Aprili,B. Baibussinov,M. Baldo Ceolin,L. Barzè,P. Benetti,E. Calligarich,N. Canci,F. Carbonara,F. Cavanna,S. Centro,A. Cesana,K. Cieslik,D. B. Cline,A. G. Cocco,A. Dabrowska,D. Dequal,A. Dermenev,R. Dolfini,C. Farnese,A. Fava,A. Ferrari,G. Fiorillo,D. Gibin,A. Gigli Berzolari,S. Gninenko,T. Golan,A. Guglielmi,M. Haranczyk,J. Holeczek,P. Karbowniczek,M. Kirsanov,J. Kisiel,I. Kochanek,J. Lagoda,M. Lantz,S. Mania,G. Mannocchi,F. Mauri,A. Menegolli,G. Meng,C. Montanari,S. Muraro,S. Otwinowski,O. Palamara,T. J. Palczewski,L. Periale,A. Piazzoli,P. Picchi,F. Pietropaolo,P. Plonski,M. Prata,P. Przewlocki,A. Rappoldi,G. L. Raselli,M. Rossella,P. Sala,E. Scantamburlo,A. Scaramelli,E. Segreto,F. Sergiampietri,J. Sobczyk,D. Stefan,J. Stepaniak,R. Sulej,M. Szarska,M. Terrani,F. Varanini,S. Ventura,C. Vignoli,T. Wachala,H. Wang,X. Yang,A. Zalewska,K. Zaremba,J. Zmuda
Physics , 2011, DOI: 10.1088/1748-0221/6/07/P07011
Abstract: Open questions are still present in fundamental Physics and Cosmology, like the nature of Dark Matter, the matter-antimatter asymmetry and the validity of the particle interaction Standard Model. Addressing these questions requires a new generation of massive particle detectors exploring the subatomic and astrophysical worlds. ICARUS T600 is the first large mass (760 ton) example of a novel detector generation able to combine the imaging capabilities of the old famous "bubble chamber" with an excellent energy measurement in huge electronic detectors. ICARUS T600 now operates at the Gran Sasso underground laboratory, studying cosmic rays, neutrino oscillation and proton decay. Physical potentialities of this novel telescope are presented through few examples of neutrino interactions reconstructed with unprecedented details. Detector design and early operation are also reported.
Elliptic flow of charged pions, protons and strange particles emitted in Pb+Au collisions at top SPS energy
D. Adamová,G. Agakichiev,A. Andronic,D. Antończyk,H. Appelsh?user,V. Belaga,J. Bielciková,P. Braun-Munzinger,O. Busch,A. Cherlin,S. Damjanovic,T. Dietel,L. Dietrich,A. Drees,W. Dubitzky,S. I. Esumi,K. Filimonov,K. Fomenko,Z. Fraenkel,C. Garabatos,P. Gl?ssel,G. Hering,J. Holeczek,M. Kalisky,G. Krobath,V. Kushpil,A. Maas,A. Marín,J. Milovsevi?,D. Mi?kowiec,Y. Panebrattsev,O. Petchenova,V. Petrácek,S. Radomski,J. Rak,I. Ravinovich,P. Rehak,H. Sako,W. Schmitz,S. Schuchmann,S. Sedykh,S. Shimansky,J. Stachel,M. Sumbera,H. Tilsner,I. Tserruya,G. Tsiledakis,J. P. Wessels,T. Wienold,J. P. Wurm,S. Yurevich,V. Yurevich
Physics , 2012, DOI: 10.1016/j.nuclphysa.2012.08.004
Abstract: Differential elliptic flow spectra v2(pT) of \pi-, K0short, p, \Lambda have been measured at \sqrt(s NN)= 17.3 GeV around midrapidity by the CERN-CERES/NA45 experiment in mid-central Pb+Au collisions (10% of \sigma(geo)). The pT range extends from about 0.1 GeV/c (0.55 GeV/c for \Lambda) to more than 2 GeV/c. Protons below 0.4 GeV/c are directly identified by dE/dx. At higher pT, proton elliptic flow v2(pT) is derived as a constituent, besides \pi+ and K+, of the elliptic flow of positive pion candidates. The retrieval requires additional inputs: (i) of the particle composition, and (ii) of v2(pT) of positive pions. For (i), particle ratios obtained by NA49 were adapted to CERES conditions; for (ii), the measured v2(pT) of negative pions is substituted, assuming \pi+ and \pi- elliptic flow magnitudes to be sufficiently close. The v2(pT) spectra are compared to ideal-hydrodynamics calculations. In synopsis of the series \pi- - K0short - p - \Lambda, flow magnitudes are seen to fall with decreasing pT progressively even below hydro calculations with early kinetic freeze-out (Tf= 160 MeV) leaving not much time for hadronic evolution. The proton v2(pT) data show a downward swing towards low pT with excursions into negative v2 values. The pion-flow isospin asymmetry observed recently by STAR at RHIC, invalidating in principle our working assumption, is found in its impact on proton flow bracketed from above by the direct proton flow data, and not to alter any of our conclusions. Results are discussed in perspective of recent viscous dynamics studies which focus on late hadronic stages.
Measurement of the neutrino velocity with the ICARUS detector at the CNGS beam
M. Antonello,P. Aprili,B. Baibussinov,M. Baldo Ceolin,P. Benetti,E. Calligarich,N. Canci,F. Carbonara,S. Centro,A. Cesana,K. Cieslik,D. B. Cline,A. G. Cocco,A. Dabrowska,D. Dequal,A. Dermenev,R. Dolfini,C. Farnese,A. Fava,A. Ferrari,G. Fiorillo,D. Gibin,A. Gigli Berzolari,S. Gninenko,A. Guglielmi,M. Haranczyk,J. Holeczek,A. Ivashkin,J. Kisiel,I. Kochanek,J. Lagoda,S. Mania,G. Mannocchi,A. Menegolli,G. Meng,C. Montanari,S. Otwinowski,L. Periale,A. Piazzoli,P. Picchi,F. Pietropaolo,P. Plonski,A. Rappoldi,G. L. Raselli,M. Rossella,C. Rubbia,P. Sala,E. Scantamburlo,A. Scaramelli,E. Segreto,F. Sergiampietri,D. Stefan,J. Stepaniak,R. Sulej,M. Szarska,M. Terrani,F. Varanini,S. Ventura,C. Vignoli,H. Wang,X. Yang,A. Zalewska,K. Zaremba,P. Alvarez Sanchez,J. Serrano
Physics , 2012, DOI: 10.1016/j.physletb.2012.05.033
Abstract: The CERN-SPS accelerator has been briefly operated in a new, lower intensity neutrino mode with ~10^12 p.o.t. /pulse and with a beam structure made of four LHC-like extractions, each with a narrow width of 3 ns, separated by 524 ns. This very tightly bunched beam structure represents a substantial progress with respect to the ordinary operation of the CNGS beam, since it allows a very accurate time-of-flight measurement of neutrinos from CERN to LNGS on an event-to-event basis. The ICARUS T600 detector has collected 7 beam-associated events, consistent with the CNGS delivered neutrino flux of 2.2 10^16 p.o.t. and in agreement with the well known characteristics of neutrino events in the LAr-TPC. The time of flight difference between the speed of light and the arriving neutrino LAr-TPC events has been analysed. The result is compatible with the simultaneous arrival of all events with equal speed, the one of light. This is in a striking difference with the reported result of OPERA that claimed that high energy neutrinos from CERN should arrive at LNGS about 60 ns earlier than expected from luminal speed.
The trigger system of the ICARUS experiment for the CNGS beam
M. Antonello,B. Baibussinov,P. Benetti,F. Boffelli,A. Bubak,E. Calligarich,S. Centro,A. Cesana,K. Cieslik,D. B. Cline,A. G. Cocco,A. Dabrowska,D. Dequal,A. Dermenev,R. Dolfini,A. Falcone,C. Farnese,A. Fava,A. Ferrari,G. Fiorillo,D. Gibin,S. Gninenko,A. Guglielmi,M. Haranczyk,J. Holeczek,M. Kirsanov,J. Kisiel,I. Kochanek,J. Lagoda,S. Mania,A. Menegolli,G. Meng,C. Montanari,M. Nicoletto,S. Otwinowski,P. Picchi,F. Pietropaolo,P. Plonski,A. Rappoldi,G. L. Raselli,M. Rossella,C. Rubbia,P. Sala,A. Scaramelli,E. Segreto,F. Sergiampietri,D. Stefan,R. Sulej,M. Szarska,M. Terrani,M. Torti,F. Varanini,S. Ventura,C. Vignoli,H. Wang,X. Yang,A. Zalewska,A. Zani,K. Zaremba
Physics , 2014, DOI: 10.1088/1748-0221/9/08/P08003
Abstract: The ICARUS T600 detector, with its 470 tons of active mass, is the largest liquid Argon TPC ever built. Operated for three years in the LNGS underground laboratory, it has collected thousands of CNGS neutrino beam interactions and cosmic ray events with energy spanning from tens of MeV to tens of GeV, with a trigger system based on scintillation light, charge signal on TPC wires and time information (for beam related events only). The performance of trigger system in terms of efficiency, background and live-time as a function of the event energy for the CNGS data taking is presented.
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