Optimisation by mathematical modeling of physicochemical characteristics of concrete containers in radioactive waste management

A method for obtaining an optimal concrete container composition used for storing radioactive waste from nuclear power plants is developed. It is applied to the radionuclides 60Co, 137Cs, 85Sr, and 54Mn. A set of recipes for concrete composition leading to an optimal solution is given

New method for determination of temperature in spallation reactions

We propose a new method for determination of temperature in spallation events. It is shown that temperature can be determined by applying the friction model of energy dissipation in participant-spectator model of a spallation process. First order estimate of temperature dependence of the participant zone on reaction Q-value is obtained from the Fermi gas model considerations. The heat diffusion process is also discussed

Higher-order moments of the elliptic flow distribution in PbPb collisions at √sNN = 5.02 TeV

The hydrodynamic flow-like behavior of charged hadrons in high-energy lead-lead collisions is studied through multiparticle correlations. The elliptic anisotropy values based on different orders of multiparticle cumulants, v 2{2k}, are measured up to the tenth order (k = 5) as functions of the collision centrality at a nucleon-nucleon center-of-mass energy of s NN $$\sqrt{s_{\textrm{NN}}}$$ = 5.02 TeV. The data were recorded by the CMS experiment at the LHC and correspond to an integrated luminosity of 0.607 nb −1. A hierarchy is observed between the coefficients, with v 2{2} > v 2{4} ≳ v 2{6} ≳ v 2{8} ≳ v 2{10}. Based on these results, centrality-dependent moments for the fluctuation-driven event-by-event v 2 distribution are determined, including the skewness, kurtosis and, for the first time, superskewness. Assuming a hydrodynamic expansion of the produced medium, these moments directly probe the initial-state geometry in high-energy nucleus-nucleus collisions

Etude electrochimique des processus de dopage et de dedopage de polymeres electroactifs en vue de leur utilisation comme materiaux d'electrodes dans des cellules rechargeables

SIGLECNRS T 59018 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

Comparison of Radiation Characteristics of HfO2 and SiO2 Incorporated in MOS Capacitor in Field of Gamma and X Radiation

The paper presents the application of a numerical method for the determination of the absorbed dose rate of gamma and X radiation in the dielectric thin layer of hafnium dioxide (RfO2) or SiO2, which is located in the structure of the MOS capacitor. Considering the radiation characteristics of the selected dielectrics, it can be concluded that there are advantages of RfO2 over SiO2 in the radiation field with high-energy X-rays. Similar radiation effects should be expected for the interaction of dielectric material with gamma ray photons originating from a Co-60 source, both in the dielectric layer with SiO2 and in that with RfO2. It can be concluded that for the same radiation absorbed dose into the MOS capacitor with RfO2, there are a greater number of generated electron-hole pairs, in which case the value of effective trapping efficiency is smaller than if SiO2 was used. © 2019 IEEE.31st IEEE International Conference on Microelectronics, MIEL 2019; 16-18. September 2019; Conference Code:15391

A possible improvement of the determination of Ba-133 activity and detection efficiency by the sum-peak method, by inclusion of the previously neglected transitions

In the treatment of Ba-133 decay by the method of coincidence summing, the transitions to the first two excited states of Cs-133 were ignored in former works. By applying the most accurate values for these transitions available in literature, we include them into the count rate equations and obtain solutions for the corresponding system. As a result of this more accurate forming of count rate equations, some terms, which contain previously ignored transition probabilities, turn out to be more significant than the conventionally included terms. We show that their inclusion in the system of count rate equations leads to fine improvements in the determinations of detection efficiencies and the activity of the Ba-133 source. (c) 2012 Elsevier B.V. All rights reserved

Measurement of the life-times distribution of Po-216

The life time distribution measurements of the alpha emitter Po-216 have been performed with semiconductor detectors. We applied a new method to obtain the distribution of time intervals between the correlated signals of decay of the Po-216. The deduced half-life of Po-216 was found to be 144.0(6) ms, supporting the earlier published measurements and with an uncertainty much lower than any other previously reported value. (C) 2017 Elsevier B.V. All rights reserved

J-PARC-HI Collaboration

XXVIIth International Conference on Ultrarelativistic Nucleus–Nucleus Collisions (Quark Matter 2018