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Öğe CONTACT INTERACTIONS AT FUTURE CIRCULAR COLLIDER BASED MUON-PROTON COLLIDERS(Jagiellonian Univ Press, 2022) Aydin, Gural; Gunaydin, Yusuf Oguzhan; Tarakcioglu, Mehmet Turker; Sahin, Mehmet; Sultansoy, SaleshRecently proposed Future Circular Collider-based muon-proton collid-ers will allow for investigating lepton-hadron interactions at the highest center-of-mass energy. In this study, we investigate the potential of these colliders for a four-fermion contact interactions search. Regarding the con-structive and destructive interferences of contact interactions, we estimated discovery, observation, and exclusion limits on the compositeness scale for the left-left, right-right, left-right, and right-left helicity structures. In this regard, we obtained compositeness scales for the left-left helicity structure at root s = 63.2 TeV FCC-based mu p collider with the 100 fb-1 integrated lu-minosity as 225.7 +/- 1.9% TeV (discovery), 269.0 +/- 2.0% TeV (observation), and 311.3 +/- 2.1% TeV (exclusion). This study's findings show that the FCC-based mu p colliders have great potential for investigating four-fermion contact interactions.Öğe Excited quarks production at FCC and SppC pp colliders(World Scientific Publ Co Pte Ltd, 2019) Sahin, Mehmet; Aydin, Gural; Gunaydin, Yusuf OguzhanPotential discovery, observation and exclusion limits of excited u and d quarks with gamma + jet final state are researched at the multi-TeV scale colliders, FCC and SppC in this paper. Both colliders, FCC and SppC, show that excited u and d quarks could be discovered up to 42.1 TeV and 55.2 TeV for u*, 30.3 TeV and 39.4 TeV for d* and 42.3 TeV and 55.5 TeV mass values for degenerate case (m(u)* = m(d)*), respectively. The determination of the excited quarks compositeness scale is examined, which will be up to multi-PeV level. Besides these analyses, free parameters (f(s), f and f') are scanned from around 0.1 up to 1 that show excited quark could be discovered at dozens of TeV with even coupling constants under 0.1.Öğe Measurement of energy transitions for the decay radiations of 75Ge and 69Ge in a high purity germanium detector(Elsevier, 2018) Aydin, Gural; Usta, Metin; Oktay, AdemPhotoactivation experiments have a wide range of application areas in nuclear, particle physics, and medical physics such as measuring energy levels and half-lifes of nuclei, experiments for understanding imaging methods in medicine, isotope production for patient treatment, radiation security and transportation, radiation therapy, and astrophysics processes. In this study, some energy transition values of the decay radiations of Ge-75 and Ge-69, which are the products of photonuclear reactions (gamma, n) with germanium isotopes (Ge-75 and Ge-69), were measured. The gamma spectrum as a result of atomic transitions were analysed by using a high purity semiconductor germanium detector and the energy transition values which are presented here were compared with the ones which are the best in literature. It was observed that the results presented are in agreement with literature in error range and some results have better precisions. (C) 2018 Elsevier B.V.Öğe Position resolution study at high energies of a sampling electromagnetic calorimeter whose active material is a scintillator with Peroxide-cured polysiloxane base(Elsevier, 2020) Aydin, Gural; Sarigul, Mehmet; Sarigul, HasanThis study is based on the simulation for the position resolution performances of a sampling electromagnetic calorimeter with a Peroxide-cured polysiloxane based scintillator as an active material. Various algorithms and corrections were applied to reconstruct hit positions. Energy deposition in the center tower and neighboring towers were used to reconstruct the beam impact position in a detector tower module consisted of a 3 x 3 array matrix. Linear weights, corrected linear weights, logarithmic weights, and corrected logarithmic weights were the different algorithms to reconstruct beam hit positions through energy weighted tower positions. Moreover, the iterative weighting method based on the logarithmic weights were applied. The re-weighting algorithm based on the iterative weighting method was seen to improve the results necessarily at relatively low beam energies. Additionally, deep neural network structures were applied over the linear weights without using any logarithmic weights or correction to improve the position resolutions.Öğe Stopping power and dose calculations with analytical and Monte Carlo methods for protons and prompt gamma range verification(Elsevier, 2018) Usta, Metin; Tufan, Mustafa Cagatay; Aydin, Gural; Bozkurt, AhmetIn this study, we have performed the calculations stopping power, depth dose, and range verification for proton beams using dielectric and Bethe-Bloch theories and FLUKA, Geant4 and MCNPX Monte Carlo codes. In the framework, as analytical studies, Drude model was applied for dielectric theory and effective charge approach with Roothaan-Hartree-Fock charge densities was used in Bethe theory. In the simulations different setup parameters were selected to evaluate the performance of three distinct Monte Carlo codes. The lung and breast tissues were investigated are considered to be related to the most common types of cancer throughout the world. The results were compared with each other and the available data in literature. In addition, the obtained results were verified with prompt gamma range data. In both stopping power values and depth-dose distributions, it was found that the Monte Carlo values give better results compared with the analytical ones while the results that agree best with ICRU data in terms of stopping power are those of the effective charge approach between the analytical methods and of the FLUKA code among the MC packages. In the depth dose distributions of the examined tissues, although the Bragg curves for Monte Carlo almost overlap, the analytical ones show significant deviations that become more pronounce with increasing energy. Verifications with the results of prompt gamma photons were attempted for 100-200 MeV protons which are regarded important for proton therapy. The analytical results are within 2%-5% and the Monte Carlo values are within 0%-2% as compared with those of the prompt gammas.Öğe Use of Gaussian-type functions for flux-based dose calculations in carbaon ion therapy(Springer, 2020) Usta, Metin; Aydin, GuralIn radiation therapy, it is very important to ensure that the radiation dose is correctly delivered to the patient. This is achieved by obtaining quantitative dose measurements for beam calibration in the treatment planning system. Dose calculations should be performed with the required accuracy to a degree of uncertainty of less than 1%. The measurement of the absorbed dose in and around body tissues irradiated with carbon ions requires careful use of materials selected from established phantom and radiation detectors. The main advantage of such materials is that when information on the energy and nature of charged particles at the desired point is incomplete or inaccurate, they can allow determination of the absorbed dose. In general, radiation interactions in a tissue representation caused by carbon ions can be characterized by calculating the linear stopping power. Carbon ions have a limited penetration depth within human tissues that depends on the energy and stopping power of these ions as they penetrate into the body. The purpose of the present study was to calculate the stopping power, range and dose to intestinal and prostate tissues of carbon ions. The stopping power values of these tissues were specified by the effective charge approach method. The 5ZaPa-NR-CV, pcemd-4 and pcSseg-4 sets of Gaussian-type functions were employed for the calculation of electronic charge density. Range calculations were made by means of the Gaussian quadrature method, making use of the continuous slowing down approximation. Flux-based dose calculations were also carried out in accordance with the Bragg-Gray theorem using the Geant4 and FLUKA simulation toolkits. The results were compared with each other and with the SRIM and CasP datasets. Then, depth-dose distributions and range values were verified by positron emission activity using the GATE toolkit. Among the different types of Gaussian functions used here, the best semi-analytical result was found for the 5ZaPa-NR-CV set. The results obtained in the present study can be used for dose verification and dose reconstruction in charged particle radiotherapy and for radiation research on the interaction of radiation with matter. The results calculated here will be useful for quantifying uncertainties associated with stopping power, range, and reconstruction of dose in charged particle therapy.
