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COMBINED ANALYSIS OF PROCESSES ππ → ππ,KK,ηη AND J/ψ DECAYS AND PARAMETERS OF SCALAR MESONS Yu.S. Surovtsev 1† , P. Bydžovský 2 , R. Kamiński 3 , V.E. Lyubovitskij 4 and M. Nagy 5 (1) Bogoliubov Laboratory of Theoretical Physics, JINR, Dubna, Russia (2) Nuclear Physics Institute, CAS, Řež near Prague, Czech Republic (3) Institute of Nuclear Physics, PAN, Cracow, Poland (4) Institut für Theoretische Physik, Universität Tübingen, Tübingen, Germany (5) Institute of Physics, SAS, Bratislava, Slovak Republic † E-mail: surovcev@theor.jinr.ru The coupled processes – the ππ scattering, ππ → KK, ππ → ηη and J/ψ → φππ,φKK – are considered in the 2- and 3-channel approaches for studying f 0 -mesons. An applied model-independent method of analysis is based on analyticity and unitarity and uses an uniformization procedure [1]. It is shown [2] that the analysis of the only ππ scattering data gives an excellent description from the threshold to 1.89 GeV with the resonance parameters, being the same as the ones, indicated in the PDG tables as estimations, and with the ππ-scattering length being in accordance with the ones gotten from the K e4 decay data, in the DIRAC experiment at CERN and also in the ChPT calculations. However, (1) the ππ → KK are not well described even qualitatively above 1.15 GeV when using the resonance parameters from the only ππ scattering analysis, and (2) in this case, the description of ππ background is unsatisfactory (pseudo-background arises). I.e., a combined analysis of ππ → ππ,KK is needed, which also is carried out satisfactorily, curing flaws (1) and partly (2) and changing inevitably the resonance parameters. The remaining ππ pseudo-background, arising at the ηη threshold and clearly indicating that it is necessary to consider explicitly also the ηη-threshold branch-point, vanishes in the 3-channel analysis of processes ππ → ππ,KK,ηη performed. Moreover, the consideration of left-hand branch-point at s = 0 in the uniformizing variable, except ηη-threshold branch-point, solves partly a problem, that the wide-resonance parameters are strongly controlled by the non-resonant background. Some possible scenarios of the resonance representations on the Riemann surface of the S-matrix, which give the similar description of the above processes and, however, the quite different parameters of some resonances [1], is rejected [3] when enlarging the analysis with adding the data on decays J/ψ → φππ,φKK fromMarkIII,DM2andespecially fromBES.Therearechangedmost considerably parameters of the f 0 (600) – now the obtained mass is in some accordance with prediction by S. Weinberg on the basis of mended symmetry. Some spectroscopic implications from results of the analysis are discussed. References [1] Yu.S. Surovtsev, P. Bydžovský and V.E. Lyubovitskij, Phys. Rev. D85, 036002 (2012). [2] Yu.S. Surovtsev et al., arXiv: 1206.3438 [hep-ph]. [3] Yu.S. Surovtsev et al., arXiv:1207.6937 [hep-ph]. 120
ANALYSIS OF POTENTIAL ADVANCED THORIUM BASED FUEL FOR EPR REACTOR Marcin Szuta, Andrzej Wojciechowski National Centre for Nuclear Research, Poland Analysis of possible ways of reduction of radioactive wastes by transmutation of radioactive long-lived fission products such as 99 Tc, 129 I and 135 Cs and by burning up of transuranic nuclides implies that the reactor core should consist of three zones with fast, epithermal and thermal neutron spectra. High flux thermal neutron environment ( 10 16 n/cm 2 s) is expected as the best way for the transmutation of most of the radioactive waste to stable or short-lived nuclides and for increasing the probability for fission such actinides as 237 Np and 238 Np. Since we are not able to construct such a reactor core with the three zones and we are not able to reach such an intense thermal neutron flux ( 10 16 n/cm 2 s) in terms of technical feasibility and in view of the inefficiency of actinides incineration for a low intensity thermal neutron flux, we focus our attention on the thorium-uranium fuel cycle as a prophylactic way of energy production where the radio-toxicity of the wastes is about three orders of magnitude smaller than in the case of classical PWR reactors. 232 Th is a better fertile material than 238 U in thermal reactors because of the three times higher thermal neutron absorption cross-section of 232 Th (7.4 barns) as compared to 238 U (2.7barns). Thus, conversion of 232 Th to 233 U is more efficient than that of 238 U to 239 Pu in thermal neutron spectrum.. The values of cross sections in brackets refer to the thermal neutrons. While the uranium 238-plutonium 239 fuel cycle requires fast neutrons to be sustainable, the thorium 232-uranium 233 fuel cycle is sustainable with either thermal neutrons or fast neutrons. As thorium based fuels have benefits in terms of radio-toxicity there are however challenges in terms of reprocessing the spent thorium based fuel. The database and experience of thorium fuels and thorium fuel cycles are very limited , as compared to UO 2 and (U,Pu)O 2 fuels, and need to be augmented before large investments are made for commercial utilization of thorium fuels and fuel cycles. That is why, as the first step of studying the thorium application feasibility, once through thorium based fuel cycle analysis for energy production and radioactive waste transmutation was undertaken, which does not require the technically difficult reprocessing of the spent fuel. The idea is to analyze the thorium based fuel application in the open cycle feasibility study in the existing light water reactors with minimal modifications in order to exploit them. Preliminary analysis of thorium based fuel application in the EPR reactor have shown that once through thorium fuel cycle can be reached with difficulty. It is inferred that the 233 U concentration tends to saturation value which does not depend on power density while the kinetics of reaching the saturation value depends on it. Monte Carlo methodology calculations for the contribution to the analysis of thorium based fuel application in the EPR reactor and in the accelerated driven systems (ADS) were used. 121
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Joint Institute for Nuclear Researc
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Organized by Joint Institute for Nu
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ON THE CONTINUUM LIMIT OF LANDAU GA
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WITTEN PARAMETER IN THE SU (2)-GLUE
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NEW DATA ON THE DIFFERENTIAL CROSS
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RELATIVISTIC CORRECTION TO THE FIRS
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NEUTRON GENERATION BY RELATIVISTIC
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COMPARISON OF THE TRIGGERS OF THE A
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NUCLEAR TRANSPARENCY EFFECT IN PROT
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Only with the value L σ = 12 of σ
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SELF-SIMILARITY OF HIGH-P T HADRON
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Λ and Σ + (1385) HYPERONS RECONST
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ON RESULTS OF Y-89 IRRADIATION WITH
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TIMELIKE STRUCTURE FUNCTIONS AND HA
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MATHEMATIAL MODEL OF DNA LESIONS O.
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ADIABATIC CHEMICAL FREEZE-OUT AND W
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which, according to the finite widt
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STATUS AND RECENT RESULTS OF THE AT
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experimental errors of about 15 % f
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MEASURING THE PHASE BETWEEN STRONG
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ANALYSIS OF DIFFERENCES ON PSEUDORA
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THE SIGNALS OF PARTIAL RESTORATION
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RECENT HEAVY ION RESULTS FROM STAR
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SPECTROSCOPY AND REGGE TRAJECTORIES
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FORWARD-BACKWARD MULTIPLICITY CORRE
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INFRARED CONFINEMENT AND MESON SPEC
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WITTEN PARAMETER IN THE SU (2)-GLUE
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where A is surface coefficient, B i
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MICROSCOPIC PION-NUCLEON AND NUCLEU
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DEUTERONS BEAM PARAMETERS MEASUREME
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PERTURBATIVE STABILITY OF THE QCD P
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OBSERVATION OF LIGHT NUCLEI FORMATI
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RESONANCE RESULTS WITH THE ALICE EX
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NEUTRAL PION FLUCTUATION STUDIES AT
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Page 140: R&D FOR THE PANDA BARREL DIRC Maria
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