Browsing by Author "Davut OLGUN"

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    Investigation of the multipolarity of electromagnetic transitions in $^88,90Kr$ nuclei
    (2006) İhsan ULUER; Sait İNAN; Davut OLGUN; Nurettin TÜRKAN
    We have determined the most appropriate Hamiltonian that is needed for present calculations of nuclei about the A=80 region by the view of Interacting Boson Model-2 (IBM-2). After obtaining the best Hamiltonian parameters, level energies and B(E2) probabilities of some transitions in $^{88,90}Kr$ nuclei were estimated. Results are compared with previous experimental and theoretical data and it is observed that they are in good agreement.
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    Comparison of IBM-2 calculations with X(5) critical point symmetry for low-lying states in $^{144-154} Nd$
    (2008) İLYAS İNCİ; Davut OLGUN; Nurettin TÜRKAN; Sait İNAN
    The X(5) would take place when moving continously from the pure U(5) symmetry to the SU(3) symmetry and it implies a definite relations among the level energies and among the E2 transition strengths. It was recently shown that a signature of phase transition is observed in the chain of Sm, Mo and Nd isotopes, where $^{152}Sm,^{104}Mo$ and $^{150}Nd$ display the predicted features of the X(5) symmetry and mark therefore the critical point. However, more detailed studies and experiments are needed to get ideas about this signature. Without entering into detail we have firstly compared the results obtained in our previous study [15] of $^{144-154}Nd$ with that of the limits in X(5) symmetry and then given a clear descripton about the validity of the Hamiltonian parameters used in the study. At the end, we have concluded that some of Nd isotopes display X(5) symmetry features.