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Öğe A comparison of calculated ?-decay half-lives with photonuclear reaction data and other experiments(World Scientific Publ Co Pte Ltd, 2021) Aygor, H. A.; Cakmak, N.; Almaz, E.; Unlu, S.We try to give a comparison of the calculated Gamow-Teller beta-decay half-lives for K-43, Ca-47 and Sr-85 nuclei with the experimental ones obtained from (gamma,p), (gamma,n) and (n,gamma) reactions, respectively. The calculations are performed within the framework of quasi-particle phonon nuclear model. The nucleon-nucleon interaction potential is included according to Pyatov's restoration method. The calculated decay half-lives are also compared with available experimental data in the literature.Öğe CSF flow patterns in the brain in patients with neuro-Behcet disease and Behcet disease(Verduci Publisher, 2017) Unlu, S.; Dogan, M.; Kapicioglu, Y.; Kamisli, S.; Oner, S.; Yildirim, I. O.; Ozturk, M.OBJECTIVE: In the etiopathogenesis of Behcet disease (BD) and Neuro-Behcet disease (NBD), vascular eclipse occurs in both the arteries and veins. The disease affects all vascular structures. The present study evaluates the use of Phase Contrast (PC) Cerebral Spinal Fluid (CSF) Flow Magnetic Resonance Imaging (MRI), a non-invasive technique for measuring CSF dynamics, for determining the level of aqueducts that are influenced in BD and NBD. PATIENTS AND METHODS: The quantitative evaluation of CSF flow in BD and NBD was performed using images obtained at the level of the cerebral aqueduct on the semi-axial plane. The PC-MRI angiography technique was used. RESULTS: There is no distinctive difference between BD and NBD that can be distinguished by the aqueduct diameters of both conditions. A clear increase in aqueduct diameter occurred BD and NBD group when compared to the control group. While there were no differences found between the BD group and the control group regarding peak velocity, average velocity, forward flow, reverse flow, net forward flow, and flow, there were distinctive increases in these various factors in the NBD group. CONCLUSIONS: Using the non-invasive PC-MRI technique, this study found that in BD and NBD patients, changes occurred in CSF flow figures. Increases in CSF parameters were also observed in NBD patients, a finding which may be helpful for future distinction between BD and NBD during diagnosis.Öğe Low-lying Gamow-Teller transitions in spherical nuclei(Maik Nauka/Interperiodica/Springer, 2012) Cakmak, N.; Unlu, S.; Selam, C.The Pyatov Method has been used to study the low-lying Gamow-Teller transitions in the mass region of 98 a (c) 1/2 A a (c) 1/2 130. The eigenvalues and eigenfunctions of the total Hamiltonian have been solved within the framework of proton-neutron quasiparticle random-phase approximation. The low-lying beta decay log(ft) values have been calculated for the nuclei under consideration.Öğe A THEORETICAL DESCRIPTION OF 2?,8-,8- DECAY TO THE EXCITED 2+STATES(Jagiellonian Univ Press, 2022) Unlu, S.; Cakmak, N.We try to give a theoretical analysis of 2 nu,8-,8- decay to the final excited 2+ states by considering SU(4) symmetry restoration within the framework of quasi-particle random phase approximation (QRPA). Pyatov's method is used to restore the symmetry violations stemming from the mean-field approximation. A comparison of the calculated decay rates with other calculations and the corresponding experimental data is given.
