http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/13732 Thu, 23 Apr 2026 06:51:16 GMT 2026-04-23T06:51:16Z http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/13876 Study of the shell evolution effect on the nuclei around the 78Ni core structure Laouet, Nadjet; Benrachi, Fatima; Guerraiche, Habiba; Benhizia, Karima The interactions between the core which is anymore inert and the valence nucleons play a very important role in the interpretation of nuclear properties far from stability. The work done in this study is based on the calculations of energy spectra and electromagnetic properties for even-even isotones with N=52, in the 78Ni region. Based on the interaction jj45apn with the space model jj45pn, we have realized some modifications considering the monopole interaction and a new interaction called jj45am is introduced. The calculations are performed in the framework of the nuclear shell model using the NuShellX@MSU code. The shell evolution, studied by estimating the effective single-particle energies (SPEs) in this region, show an important influence on the nuclear structure properties. The obtained results using the new interaction jj45am are in agreement with the experimental data, and better than those given by the original one jj45apn. Tue, 01 Jan 2019 00:00:00 GMT http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/13876 2019-01-01T00:00:00Z http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/13875 Dissipative dynamics within stochastic mean-field approach ULGEN, Ibrahim; YILMAZ, Bulent The time-dependent Hartree-Fock (TDHF) and density functional theory (DFT) are among the most useful approaches within mean-field theories for studying static and dynamic properties of complex many-body systems in different branches of physics. Despite the fact that they provide a good approximation for the average properties of one-body degrees of freedom, they are known to fail to include quantal fluctuations of collective observables and they do not provide sufficient dissipation of collective motion. In order to incorporate these missing effects the stochastic mean-field (SMF) approach was proposed (Ayik 2008). In the SMF approach a set of stochastic initial one-body densities are evolved. Each stochastic one-body density matrix consists of a set of stochastic Gaussian random numbers that satisfy the first and second moments of collective one-body observables. Recent works indicate that the SMF approach provides a good description of the dynamics of the nuclear systems (Yilmaz et al. 2018; Ayik et al. 2019). In this work, the one-dimensional Fermi-Hubbard model is simulated with the SMF approach by using different distributions such as Gaussian, uniform, bimodal and two-point distributions. The dissipative dynamics are discussed and the predictive power of the SMF approach with different probability distributions are compared with each other and the exact dynamics. As a result it is shown that by considering different distributions, the predictive power of the SMF approach can be improved. Tue, 01 Jan 2019 00:00:00 GMT http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/13875 2019-01-01T00:00:00Z http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/13874 Treatise of angular distributions of 3He elastic scattering from stable Selenium isotopes Cinan, Z.Merve; Yılmaz, A.Hakan; Erol, Burcu Angular distributions of 3He elastic scattering reactions from stable Selenium isotopes have systematically calculated within the theoretical framework. Optical-model parameters for Woods-Saxon real and imaginary volume potentials have been used to illustrate the data. The corresponding ratios to Rutherford scattering and relevant barrier distributions of elastic scattering cross-sections have attained from 0⁰ to 180⁰. The theoretical calculations shed light on a well-rounded definition of the empricial angular distribution data. Tue, 01 Jan 2019 00:00:00 GMT http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/13874 2019-01-01T00:00:00Z http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/13873 Transmission line fault location: Simulation of real faults using wavelet transform based travelling wave methods Akdag, Mustafa; Rüstemli, Sabir In this study, High Voltage Transmission Line fault location accuracy of distance relays running impedance algorithm are compared with Travelling Wave (TW) method. Line faults in 154 kV Tatvan – Muş and 154 kV Patnos-Erciş lines in Turkish Electrical Transmission System are analyzed. Real faults in both lines are simulated in MATLAB-SIMULINK. Tower configuration and conductor properties of the lines and the source impedances are included in the simulation to comply with real system. Simulations show that both single-end and double-end Wavelet Transform (WT) based TW methods have better accuracy then the distance relays computing fault location by impedance methods. Tue, 01 Jan 2019 00:00:00 GMT http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/13873 2019-01-01T00:00:00Z