Browsing by Author "Akkoyun, S."

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    Ground-state properties of some N=Z nuclei
    (Ankara : Ankara Üniversitesi, 2017) Akkoyun, S.; Bayram, T.; Şentürk, Ş.; Fen Fakültesi
    The ground-state properties of 64Ge, 68Se, 72Kr and 76Sr (N=Z) nuclei have been investigated by using Hartree-FockBogolibov (HFB) method with Sly4 Skyrme forces, Relativistic Mean Field (RMF) model with NL3 and recently proposed DEFNE interaction parameters sets. For determination of ground-state, axially deformed shape and quadrupole moment constrained calculations have been employed in RMF model. The results of the present study have been compared with each other and available experimental data in the literature. The ground-state binding energies, neutron, proton and charge radii, quadrupole moment deformation parameters of these nuclei have been calculated. Furthermore, neutron skin thickness of the above mentioned nuclei as a function of deformation parameter have been obtained and discussed in detail.
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    Study of the Order-to-Chaos transition in W-174 with the AGATA-Demonstrator
    (2012) Akkoyun, S.; Kaskas, A.; Fen Fakültesi
    The transition between order and chaos is studied in the warm rotating nucleus W-174 by gamma-spectroscopy, focusing on the conservation of selection rules of the K quantum number with the excitation energy, where K is the projection of the total angular momentum on the symmetry axis. The W-174 nucleus was populated by the fusion-evaporation reaction of Ti-50 (at 217 MeV) on a Te-128 backed target. The measurement was performed in July 2010 at Legnaro National Laboratories of INFN using the AGATA Demonstrator HPGe-array coupled to an array of 27 BaF2 scintillators, named Helena. The data analysis concentrates on gamma-gamma coincidence matrices selecting the gamma-decay flow populating low-K and high-K structures. By a statistical fluctuation analysis the total number of low-K and high-K band scan be evaluated as a function of excitation energy. Comparisons with cranked shell model calculations at finite temperature are used to extract in formation on the on set of the chaotic regime as a function of excitation energy.