Yazar "Ogul, Hasan" seçeneğine göre listele
Listeleniyor 1 - 20 / 40
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe A comparative study of 3D printing and sol-gel polymer production techniques: A case study on usage of ABS polymer for radiation shielding(Korean Nuclear Soc, 2024) Ogul, Hasan; Gultekin, Batuhan; Bulut, Fatih; Us, HakanThis study focuses on the comparative analysis of ABS polymer samples produced using two distinct manufacturing techniques: 3D printing and the sol -gel methods. In the first approach, ABS polymer was augmented with rare earth oxides, Er 2 O 3 and Gd 2 O 3 , in nano powder form and fabricated into test specimens using 3D printing technology. In the second approach, identical samples were prepared via the sol -gel technique involving mold-based fabrication. Elemental content analysis revealed no significant differences between the samples produced by the two methods. The study proceeds to evaluate the gamma-ray shielding, neutron shielding, temperature resistance, and SEM/EDS pictures of ABS samples generated through both techniques. 3D printing method exhibited more favorable results in terms of structure morphology and thermal stability while there is no significant difference for radiation shielding. The results provide insights into the performance and suitability of each production method for radiation shielding applications. This research not only contributes to enhancing radiation shielding technology but also informs the selection of the most appropriate fabrication method for specific applications in nuclear technologies and diagnostic energy range in medical purposes.Öğe A phenomenological calculation for W+W- diboson production for the Large Hadron Collider and Future Circular Collider(Tubitak Scientific & Technological Research Council Turkey, 2018) Dilsiz, Kamuran; Ogul, HasanThe Large Hadron Collider (LHC) at CERN has been designed to collide beams of protons at 7, 8, 13, and 14 TeV center-of-mass energies and a new hadron collider called the Future Circular Collider (FCC), which is larger and more energetic than the LHC, is being planned for the near future. The maximum planned energy for FCC is 100 TeV center-of-mass energy. In this regard, we present the leading order and next-to-leading order cross-section predictions of two simultaneously produced opposite-sign W bosons at 7, 8, 13, 14, and 100 TeV center-of-mass energies by using the MCFM MC generator. The results are obtained by CT14, MMHT2014, and MSTW2008 parton distribution functions. Finally, the advantage of increasing collision energy at hadron colliders is discussed by comparing the amount of data recorded at different center-of-mass energies for the pp -> W+W- process.Öğe A study on the interaction parameters of charged and uncharged radiation types with some indoor plants(Pergamon-Elsevier Science Ltd, 2024) Caf, Ahmet; Akman, Ferdi; Ogul, Hasan; Kacal, Mustafa RecepThis study investigates how gamma rays, neutrons, and electrons interact with five commonly found indoor plants: Spathiphyllum wallisii (SW), Ficus elastica (FE), Dieffenbachia camilla (DC), Schefflera arboricola (SA), and Ficus benjamina (FB). Utilizing experimental measurements (with HPGe detector), Monte Carlo simulations (GEANT4 and FLUKA), and theoretical calculations (ESTAR and WinXCOM), some radiation interaction parameters for gamma rays, fast neutrons, thermal neutrons, and electrons were determined. Secondary particle generation was also analyzed to provide a comprehensive assessment. The determined linear attenuation coefficients with the help of the WinXCOM are 0.1376, 0.1662, 0.1385, 0.1651 and 0.1698 cm(-1 )for SW, FE, DC, SA and FB, respectively. The calculated total macroscopic cross sections for indoor plants in the same sample order are 2.0290, 2.0350, 2.0285, 2.0363 and 2.0362 cm(-1). Among the investigated plants, FB exhibited the highest gamma ray interaction, while SA and FB showed superior interaction against fast neutrons compared to SW and DC. The findings reveal significant variations in interaction effectiveness and secondary radiation production across these plants, offering valuable insights for radiation safety and environmental health evaluations.Öğe Cross Section Prediction for Inclusive Production of Z Boson in pp Collisions at √s=14TeV: A Study of Systematic Uncertainty due to Scale Dependence(Hindawi Ltd, 2017) Ogul, Hasan; Dilsiz, KamuranPrediction of Z -> l(+)l(-) production cross section (where l(+/-) = e(+/-) mu(+/-)) in proton-proton collisions at root s = 14TeV is estimated up to next-to-next-to-leading order (NNLO) in perturbative QCD including next-to-leading order (NLO) electroweak (EW) corrections. The total inclusive Z boson production cross section times leptonic branching ratio, within 116 GeV, is predicted using NNLO HERAPDF2.0 at NNLO QCD and NLO EW as.. Tot the invariant mass window 66 < m(u) < 116 GeV, is predicted using NNLO HERAPDF2.0 at NNLO QCD and NLO EW as sigma(Tot)(z) = 2111.69(-26.92)(+26.31) (PDF) +/- 11 (alpha(s)) +/- 17 (scale(-30.98)(+57.41)) (parameterization and model). Theoretical prediction of the fiducial cross section is further computed with the latest modern PDF models (CT14, MMHT2014, NNPDF3.0, HERAPDF2.0, and ABM12) at NNLO for QCD and NLO for EW. The central values of the predictions are based on DYNNLO 1.5 program and the uncertainties are extracted using FEWZ 3.1 program. In addition, the cross section is also calculated as functions of mu(R) and mu(F) scales. The choice of mu(R) and mu(F) for scale variation uncertainty is further discussed in detail.Öğe Design and evaluation of multi-layer polybenzoxazine composites for enhanced gamma and neutron shielding(Walter De Gruyter Gmbh, 2025) Ogul, HasanThis study investigates the gamma and neutron shielding performance of novel polybenzoxazine (PBz) based composites reinforced with Mo2C, Boron, and WS2 additives. The additives are mixed into the matrix at various mass ratios and then each sample is evaluated in terms of radiation interactions. A three-layered shielding structure was further designed with PBz-Mo2C-25 as the front layer, PBz-B-25 as the intermediate layer, and PBz-WS2-25 as the rear layer. The obtained results show that multi-layer configuration, PBz-3L, further enhanced low-energy neutron attenuation, achieving substantially greater reductions in thermal and epithermal flux compared to single-layer Mo2C- and WS2-reinforced composites. For photons, the multilayer structure achieves radiation protection efficiency (RPE) values exceeding 99 % at low gamma energies. Total ionizing dose (TID) and displacement per atom (DPA) analyses are also reported. These findings confirm the superior shielding capability of the three-layer composite, highlighting its potential for advanced radiation protection applications in nuclear and aerospace environments.Öğe Detailed k-Factor Studies Using Inclusive Production of W Bosons in pp Collisions(Korean Physical Soc, 2018) Ogul, HasanThe theoretical k-Factor describes the difference between leading and higher order cross sections and its proper usage has a crucial importance for theoretical predictions. In this paper, three different ways are considered to define the k-Factor of W bosons at = 14 TeV in proton-proton collisions. First, we calculate k-Factors using inclusive W (+/-) boson leading order (LO), next-toleading order (NLO) and next-to-next-to-leading order (NNLO) quantum chromodynamics (QCD) cross sections with LO, NLO, NNLO parton distribution function (PDF) models, respectively. The second approach used is the calculation of k-Factors based on LO, NLO and NNLO QCD cross sections with the NNLO PDF model. The last method used here is the calculation of k-Factors using the LO QCD cross section with LO, NLO and NNLO PDF models. We further investigated the dependencies of the k-Factor on the renormalization (mu R) and the factorization (mu F) scales, the strong coupling constant (alpha (s) ), the charges of W boson and the collision energy of protons in a range of 7 to 100 TeV.Öğe Estimation of neutron and gamma-ray attenuation characteristics of some ferrites: Geant4, FLUKA and WinXCom studies(Pergamon-Elsevier Science Ltd, 2023) V. More, Chaitali; Akman, Ferdi; Dilsiz, Kamuran; Ogul, Hasan; Pawar, Pravina P.Ferrites are ceramic oxide materials consisting of mainly iron oxide and they have become massively important materials commercially and technologically, having a multitude of uses and applications. The protection against neutron-gamma mixed radiation is crucial in several nuclear applications. From this standpoint, mass attenuation coefficient, radiation protection efficiency and transmission factor of some ferrites namely barium, strontium, manganese, copper and cadmium ferrite has been computed using Geant4 and FLUKA simulations. Based on the simulated mass attenuation coefficient, other significant parameters such as linear attenuation coefficient, effective atomic and electron number, conductivity, half value layer, and mean free path were calculated for the selected ferrite materials. The validation of Monte Carlo geometry has been provided by comparing the mass attenuation coefficient results with standard WinXCom data. Gamma ray exposure buildup factors were computed using geometric progression fitting formula for the chosen ferrites in the energy range 0.015-15 MeV at penetration depths up to 40 mfp. The findings of the present work reveal that among the studied ferrites, barium ferrite and copper ferrite possess superior gamma ray and fast neutron attenuation capability, respectively. The present work provides a comprehensive investigation of the selected iron oxides in the field of neutron and gamma ray.Öğe Evaluation of Acrylonitrile Butadiene Styrene (ABS) polymer reinforced with Bi and TiO2 nanopowders for gamma and neutron shielding(Walter De Gruyter Gmbh, 2023) Gultekin, Batuhan; Ogul, Hasan3D printer technology has recently become easily reachable technology and are used to create simple or complex structures with high-quality. Its superior advantages could also be useful on the production of effective radiation shielding materials. On this purpose, the presented work studies the gamma and neutron shielding effectiveness of Acrylonitrile Butadiene Styrene (ABS) sample, a 3D printing material, reinforced with Bi and TiO2 nanopowders at various gamma and neutron energies. The gamma shielding properties were evaluated using experimental (High Purity Germanium detector system), theoretical (WinXCOM computer program) and simulation techniques (GEANT4 and FLUKA) in a wide gamma energy region ranging from 59.5 to 1332.5 keV. The investigation on neutron attenuation capabilities of the printed composites were performed with help of simulation and theoretical approaches for various sample thickness and neutron energies. The half value layer of ABS-Bi10 sample is found to be as 4.9565 cm, which is much smaller than some commercial polymers: polyvinylidenechloride, polyamide, polyacrylonitrile, polyphenylenesulfide, and unsaturated polyester. With the usage of 3D printing technology, significant enhancements in neutron and gamma shielding were reported.Öğe Evaluation of CdS doped polyester composites regarding gamma and neutron shielding properties(Pergamon-Elsevier Science Ltd, 2021) Dilsiz, Kamuran; Ogul, Hasan; Akman, Ferdi; Agar, Osman; Kacal, Mustafa Recep; Polat, Hasan; Dursun, InanIn this study, CdS doped polyester composites were produced at different weight ratios, and the impact of dopant amount on gamma and neutron shielding characteristics of a new composite material were further evaluated: the composite matrix was doped at 5%, 10%, 15% and 20% CdS weight ratios of the prepared composite. Then, the produced polyester materials have been characterized using a scanning electron microscope (SEM) and X-ray diffraction (XRD) patterns. Following the structure characterization, the prepared composites were tested using one gamma spectrometer system based HPGe detector with help of Na-22, Mn-54, Co-57, Co-60, Ba-133, Cs-137, Eu-152 and Am-241 radioactive point-isotropic sources in order to perform the evaluation in a wide energy range of gamma. The obtained results were compared to the results of Geant4 and WinXCOM simulation codes. On the last step of the presented work, the neutron removal cross sections of produced polyester composites were calculated using partial density of elements and their cross sections, and then, neutron shielding characteristics of the prepared samples were determined with help of Geant4 simulation toolkit. Both tested and simulated results of gamma shielding evaluation showed good agreement, and, for all considered photon energies, mass attenuation coefficient (mu/p) values of CdS (20%) were always found to be greater than the mu/p values of other samples (5%, 10%, 15%). The results for neutron shielding showed that neutron transmission was decreasing with the increase of CdS in the material. In short, having higher mu/p values and lower neutron transmission shows that increasing the amount of CdS in the sample causes the higher radiation shielding property for both gamma and neutron.Öğe Evaluation of Energy-Dependent Gamma-Ray Interaction Mechanisms in Biological Macro Molecules(Taylor & Francis Inc, 2026) Cakir, Yusuf; Ogul, Hasan; Erkoyuncu, Ilhami; Akman, FerdiThis study investigates the gamma-ray interaction mechanisms and radiation-induced damage in selected proteins (casein, lactoferrin, and lysozyme) and fatty acids (caproic acid, capric acid, and docosahexaenoic acid) using Monte Carlo simulations and theoretical code. The gamma-ray interaction parameters were determined using WinXCOM and compared with GEANT4 and FLUKA simulations in the energy range of 0.04 to 2 MeV. In addition, the number and average energy of secondary electrons generated by photon interactions were obtained using the GEANT4 simulation tool. Radiation-induced damage was quantified through displacement per atom (DPA) and total ionizing dose (TID) calculations using the FLUKA code at representative photon energies of 0.08 MeV, 0.5 MeV, and 1 MeV. The results showed strong agreement (<3% deviation) between the theoretical and simulation outputs, validating the reliability of the applied methods. Lactoferrin exhibited the highest mu/rho, mu, and lowest half-value layer values due to its higher density and heavier elemental composition, whereas the fatty acids showed weaker attenuation capability. Secondary electron production was highest in lactoferrin and lowest in the fatty acids. The DPA and TID analyses revealed that fatty acids are more susceptible to displacement damage at lower energies, while proteins exhibited higher structural disturbance at higher photon energies. In short, the findings demonstrate that gamma-ray interaction probability, secondary electron production, and radiation damage strongly depend on molecular density, composition, and photon energy. These results could provide valuable information for radiation effects on biomolecules, with implications for radiobiology, food irradiation, and medical radiation applications.Öğe Evaluation of Monocrystalline and Polycrystalline Photovoltaic Panels in Sinop Province Conditions(2021) Karaağaç, Mehmet Onur; Ogul, Hasan; Bulut, FatihDue to the increase in energy consumption and environmental pollution in recent years, countries have included renewable energy in their long-term energy policies by supporting researches to increase the usage diversity and performance of renewable energy sources. Solar energy, one of these renewable energy types, and its various applications are of great importance to increase the energy production diversity. In this context, evaluation of monocrystalline and polycrystalline photovoltaic panel performance was performed under Sinop climate conditions. In the first stage, the most suitable panel tilt for Sinop province was found by recording the voltage and current values of the panels at different panel angles. Then, in different days, the efficiencies of the panels were calculated using the determined optimum angle and compared with the literature. Finally, the effect of temperature change on the panels was evaluated. With this study, the most suitable panel type is determined for Sinop province and its surrounding conditions, thus preventing unnecessary investments and efficiency losses.Öğe Evaluation of radiation shielding, secondary radiation, and radiation damage in boron carbide and chromium diboride reinforced polymer composites(Elsevier Science Sa, 2025) Ogul, Hasan; Akman, Ferdi; Ozdogan, Hasan; Kacal, Mustafa Recep; Tursucu, Ahmet; Polat, Hasan; Erkoyuncu, IlhamiThe presented work studies the radiation shielding effectiveness of polymer-based composites reinforced with B4C and CrB2 for both gamma-ray and neutron protection. The incorporation of CrB2 was found to significantly enhance gamma-ray attenuation, with the BCCrB-50 formulation demonstrating the highest shielding efficiency. Neutron shielding performance was also improved, particularly at thermal and fast neutron energies, with the additives playing a key role in reducing neutron transmission. Total Ionizing Dose (TID) and Displacement Per Atom (DPA) analyses were performed to assess the composites' radiation resistance, revealing that the BCCrB composites effectively minimize radiation exposure. These results suggest that BCCrB composites are a promising, environmentally friendly alternative for radiation shielding in various applications, including nuclear energy systems.Öğe First- and second-law thermodynamic analyses of a combined natural gas cycle power plant: Sankey and Grossman diagrams(Tubitak Scientific & Technological Research Council Turkey, 2019) Karaagac, Mehmet Onur; Kabul, Ahmet; Ogul, HasanThe natural gas combined cycle power plant is one of the best options for generating electricity due to its use of low carbon fuels, high efficiency, and operational flexibility. These plants consist of a combination of Brayton and Rankine cycles, and investigation of these cycles is performed in this paper. Here the parameters of pressure and temperature used in the calculations are taken from a combined cycle power plant. The net power output of the system at 25 degrees C ambient temperature and 101.325 kPa pressure was calculated as 45 and 12 MW for Brayton and Rankine cycles, respectively. In addition, Brayton, Rankine, and combined cycle efficiencies were calculated as 37.5%, 27%, and 47.5%, while the exergy efficiencies were determined as 36%, 44%, and 46%, respectively. In the system elements, the most energy was lost in the combustion chamber and the highest exergy efficiency was achieved in the compressor at 95% level. Impacts of an increase in ambient temperature, compressor pressure ratio, and change on turbine inlet temperature were further investigated. Energy (Sankey) and exergy (Grossman) flow diagrams were further drawn based on the analyses obtained from the combined cycle power plants.Öğe Forward-backward asymmetry of Drell-Yan lepton pairs at 14 TeV center-of-mass energy(Tubitak Scientific & Technological Research Council Turkey, 2018) Dilsiz, Kamuran; Ogul, HasanIn this paper, fiducial cross-sections of lepton pairs with opposite charge via Z -> l(+)l(-) (l(+/-) = mu(+/-), e(+/-)) are calculated at a center-of-mass energy of 14 TeV by applying different transverse momentum selections to evaluate their impact on the production cross-section as well as the differential cross-section of Z bosons in terms of lepton pseudorapidity. The predictions are computed by next-to-next-to-leading order quantum chromodynamics including next-to-leading order electroweak corrections. Forward-backward asymmetry prediction for the Drell-Yan production in proton-proton collision is further calculated at 14 TeV using HERAPDF2.0, MMHT2014, NNPDF3.1, and CT14 parton distribution function models. Then 14 TeV QCD predictions of forward-backward asymmetry are presented as a function of dilepton mass for four different Z boson rapidity regions.Öğe Gamma and Neutron Interaction Characteristics of Hf-Reinforced CuAlNi Alloys: Experimental and Monte Carlo Evaluation(Taylor & Francis Inc, 2026) Niksarlioglu, Secil; Kacal, Mustafa Recep; Ogul, Hasan; Akman, FerdiThis study presents the gamma and neutron radiation shielding efficiency of CuAlNi alloys reinforced with different weight percentages (3 wt%, 6 wt%, and 9 wt%) of Hf, the secondary radiations generated due to the radiation interaction with the produced alloys, and the Total ionizing dose and displacement per atom parameters to determine the radiation effect on the considered alloys. CuAlNi-Hf alloys are promising because of their shape memory property. Experimental gamma radiation measurements were performed with a high-purity germanium detector using 241Am, 133Ba, 22Na, 137Cs, and 60Co radioactive sources, while Monte Carlo simulations and theoretical calculations were performed with the GEANT4, FLUKA, and WinXCOM programs.The gamma radiation shielding efficiency of the CuAlNi-based alloys increased with higher Hf content, whereas their thermal neutron shielding efficiency decreased. According to the obtained results of all the presented parameters, the CuAlNiHf9 alloy had the best gamma radiation shielding properties, while the CuAlNiHf0 alloy exhibited superior shielding properties at epithermal energies neutron (100 eV). The CuAlNiHf9 alloy, with mass attenuation coefficient values of 1.6136 cm2/g-1 at 59.5 keV, 0.0871 cm2/g-1 at 661.7 keV, and 0.0515 cm2/g-1 at 1332.5 keV, was identified as the alloy that provided the highest protection against gamma radiation. The total ionizing dose and displacement per atom values were observed to rise with increasing gamma-ray energy, while thermal and fast neutrons exhibited a nonlinear trend.Öğe Gamma and Neutron Shielding Performance of ABS Polymer Doped with MoS2 and CaWO4: Experimental and Simulation-Based Study(Taylor & Francis Inc, 2025) Bastug, Elif Ahsen; Ogul, Hasan; Bulut, Fatih; Akman, FerdiIn this study, acrylonitrile butadiene styrene (ABS) polymer composites reinforced with different weight fractions of MoS2 and CaWO4 were fabricated and investigated for their gamma and neutron shielding capabilities through both experimental and simulation-based approaches. Gamma-ray attenuation measurements were conducted using a NaI(Tl) detector system, while GEANT4 and FLUKA Monte Carlo codes were employed to simulate both gamma and neutron shielding performance. Additionally, theoretical values of mass attenuation coefficients (MACs) were calculated using EpiXS software. Scanning electron microscopy analysis revealed a homogeneous dispersion of CaWO4 and MoS2 particles within the ABS matrix, although some agglomeration was observed at higher loadings. The results demonstrated that MS-3 and CW-3 exhibited superior gamma radiation shielding performance, with a MAC increase of approximately three times compared to ABS-0 at 59.5 keV. Notably, the MS-3 and CW-3 samples exhibited enhanced gamma attenuation, especially in the low-energy range. Simulations also confirmed enhanced neutron shielding efficiency, particularly against thermal neutrons. In addition, the Monte Carlo simulations revealed that CW-3 generated the lowest levels of secondary gamma and neutron radiation, enhancing its overall shielding efficiency. For thermal neutrons, the CW-3 sample transmitted only similar to 8% of neutrons and produced 346 933 secondary photons. These findings highlight the potential of the developed composites as advanced materials for radiation protection in nuclear energy systems, medical facilities, and aerospace engineering.Öğe Gamma radiation shielding performance of CuxAg(1-x)-yalloys: Experimental, theoretical and simulation results(Pergamon-Elsevier Science Ltd, 2022) Turhan, Mehmet Fatih; Akman, Ferdi; Taser, Ahmet; Dilsiz, Kamuran; Ogul, Hasan; Kacal, Mustafa Recep; Agar, OsmanDifferent types of photon shielding parameters such as total mass attenuation coefficient (mu/p), linear attenuation coefficients (mu), half value layers (HVL), mean free paths (MFP), effective atomic numbers (Z(Eff)), energy absorption build-up factors (EABF), exposure build-up factors (EBF) and kerma relative to air were investigated for the fabricated Cu-Ag based alloys. The considered parameters were measured through gamma spectrometer equipped with HPGe detector in order to obtain the experimental attenuation coefficients and other related parameters at various photon energy in the energy range 59.5-1332.5 keV. The measured mu/rho values were confirmed with WinXCOM database results. FLUKA and GEANT4 simulation codes were used to examine the compatibility of the experimental and WinXCOM database results with these simulation codes. The exposure buildup factors of the alloy samples were estimated with help of Geometric Progression fitting formula over photon energy 0.015-15 MeV up to 40 mfp penetration depth. The results revealed that the exhibited effectiveness of Cu0.2Ag0.8 alloys against high energetic photon radiations had a good performance than that of alternative absorbers such conventional concretes, glasses and some alloys. The results of the present survey can be quite useful for possible applications of such materials, especially in nuclear laboratory and reactor core design for preference of effective photon shielding materials.Öğe Gamma-ray shielding features of Co1-xCuxFe2O4 ferrite: A combined experimental, theoretical and simulation investigation(Pergamon-Elsevier Science Ltd, 2024) Gaikwad, Kalidas B.; Gattu, Ketan P.; More, Chaitali, V; Ogul, Hasan; Pawar, Pravina P.This study describes a rapid synthesis of Co1-xCuxFe2O4 1-x Cu x Fe 2 O 4 nanoparticles using sol-gel auto-ignition and the produced materials were examined using different techniques such as XRD (X-Ray Diffraction), UV-Vis (Ultraviolet-visible), (FTIR Fourier Transform Infrared Spectroscopy), FE-SEM (Field emission scanning electron microscopy), and EDS (Energy-dispersive X-ray spectroscopy) to explore their structural, optical, and functional group morphological properties, and elemental analysis. Additionally, utilizing several gamma-ray sources and a NaI (Tl) scintillation detector, we studied the gamma-ray shielding characteristics for the prepared materials. Experimental results were validated by the results of XCOM program and the Geant4 simulations. For four chosen ferrites, the gamma ray energy absorption build-up factor is investigated at 0.01-15 MeV incident photon energy and penetration depths of 1-40 mean free path, mfp, using the geometric progression fitting technique. Ferrite samples can be employed as radiation attenuators across a range of nuclear domains, as per the findings of this study. In comparison to the other spinel ferrites, the Co1-xCuxFe2O4 1-x Cu x Fe 2 O 4 (x = 0.75) ferrite demonstrated superior shielding capabilities. Important details regarding the physio-chemical properties of spinel ferrites and their ability to shield against gamma radiation are provided in the present study.Öğe High Order QCD Predictions for Inclusive Production of W Bosons in pp Collisions at √s=13 TeV(Hindawi Ltd, 2016) Ogul, Hasan; Dilsiz, Kamuran; Tiras, Emrah; Tan, Ping; Onel, Yasar; Nachtman, JanePredictions of fiducial cross sections, differential cross sections, and lepton charge asymmetry are presented for the production of W-+/- bosons with leptonic decay up to next-to-next-to-leading order (NNLO) in perturbative QCD. Differential cross sections of W-+/- bosons and W boson lepton charge asymmetry are computed as a function of lepton pseudorapidity for a defined fiducial region in pp collisions at root s = 13TeV. Numerical results of fiducial W-+/- cross section predictions are presented with the latest modern PDF models at next-to-leading order (NLO) and NNLO. It is found that the CT14 and NNPDF 3.0 predictions with NNLO QCD corrections are about 4% higher than the NLO CT14 and NNPDF 3.0 predictions while MMHT 2014 predictions with NLO QCD corrections are smaller than its NNLO QCD predictions by approximately 6%. In addition, the NNLO QCD corrections reduce the scale variation uncertainty on the cross section by a factor of 3.5. The prediction of central values and considered uncertainties are obtained using FEWZ 3.1 program.Öğe Interaction Parameters of Some Polymers Used in Nuclear Power Plants with Ionizing Radiation, Produced Secondary Radiations and Radiation Damages(Wiley-V C H Verlag Gmbh, 2025) Akman, Ferdi; Ogul, HasanThe primary interactions of polypropylene (PP), poly(vinyl acetate) (PVA), ethylene-vinyl acetate (EVA), polyvinyl chloride (PVC), polychloroprene (CR) and polyurethane (PUR) polymers preferred in the nuclear industry with gamma and neutron radiations, secondary radiations formed after neutron interactions and damages given to polymers by these ionizing radiations are investigated. The gamma interaction parameters Were determined in the photon energy range of 0.03-20 MeV using WinXCOM, GEANT4 and FLUKA methods. Also, energy absorption and exposure buildup factors and Kerma parameters are calculated at different photon energies. To investigate the interactions of the studied polymers with neutron, the effective removal cross-section for fast neutrons with theoretical and the partial neutron rates passing through the studied polymer at 4.5 MeV, 100 eV and 0.025 eV energies are determined with simulation codes. The numbers of secondary gamma-rays and neutrons Were obtained with GEANT4. The Total Ionizing Dose and Displacements per Atom parameters are studied with the help of FLUKA simulation. It is observed that the interaction of PVC polymer with gamma radiation and PP polymer with neutron particles is higher than the others. The secondary radiation from PVC and CR is less. The PP, PVA, and EVA exhibit superior resistance to radiation damage.
