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    (Kırıkkale, 2002) Uluer, İhsan
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    A correspondence between IBA-1 and IBA-2 models and electromagnetic transitions in the decay of some erbium isotopes
    (Indian Acad Sciences, 2005) Yazar, Harun Reşit; Uluer, İhsan
    The interacting boson approximation IBA-1 model space, in which neutron and proton degrees of freedom are not distinguished, can be considered as a subspace of the IBA-2 model space. Using the microscopic background of the IBA-2 model, a correspondence can be established between IBA-1 and IBA-2 model space. Since the space of the IBA-1 model can be regarded as a subspace of the IBA-2 model there is a unique way to 'Project' the operators of the IBA-2 model onto those of IBA-1. This projection can be carried out using the F-spin formalism. In the IBA-2 model, the lowest states are indeed fully symmetric, and using the calculations with the help of this projection, we explore the energy levels and the electric quadrupole transition probabilities B(E2-, I-i -> I-f) and gamma-ray E2/M1 mixing ratios for selected transitions of Er-161,Er-161,Er-166,Er-168,Er-170. Owing to admixtures of non-fully-symmetric states in IBA-2, we renormalized the parameters (epsilon) and (kappa). This is the first time we show that this projection can be applied to some heavier isotopes and the results obtained for Er-162,Er-164,Er-166,Er-168,Er-170 isotopes are reasonably in good agreement with the previous experimental values.
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    IBM-2 calculations of some even-even selenium nuclei
    (Central European Science Journals, 2006) Türkan, Nurettin; Olgun, Davut; Uluer, İhsan
    In this study, we determined the most appropriate Hamiltonian that is needed for present calculations of nuclei in the A congruent to 80 region by the view of interacting boson model (IBM-2). Using the best-fitted values of parameters in the Hamiltonian, we have calculated energy levels and B(E2) values for a number of transitions in some doubly even Se nuclei. The results were compared with the previous experimental and theoretical data and it is observed that they are in good agreement. The calculations have been extended to Se isotopes with A < 76 for which some B(E2) values are still not known. (C) Central European Science Journals Warsaw and Springer-Verlag Berlin Heidelberg. All rights reserved.
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    The Investigation of Electromagnetic Transition Probabilities of Gadolinium Isotopes with the IBFM-1 Model
    (Physical Soc Republic China, 2010) Yazar, Harun Reşit; Uluer, İhsan; Ünaloğlu, Volkan; Yaşar, Sinan
    We investigate the energy levels and the electric quadrupole transition probabilities B(E2;I(i) -> I(f)) and gamma-ray E2/M1 mixing ratios for selected transitions of (152 similar to 156)Gd. The results are in reasonably good agreement with the previous experimental values. The negative spin states of the even-odd (153)Gd isotope were studied within the framework of the interacting boson-fermion model (IBFM-1). The single fermion is assumed to be in one of the lh(9/2), 3p(3/2), 2f(5/2), and 3p(1/2) single particle orbits. It was found that the calculated negative spin state energy spectra of the even-odd (153)Gd isotope agrees quite well with the experimental data. The observed B(E2) values were also calculated and compared with the experimental data.
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    The investigation of the E2/M1 multipole mixing ratios and deformation parameters of electromagnetic transitions in decay of 156Gd
    (2002) Baylan, Mehmet; Uluer, İhsan
    The ?(E2/M1) multipole mixing ratios and deformation parameters of electromagnetic transitions in decay of 156Gd nucleus were studied. The rotation-vibration model (RTV) containing different deformations for protons and neutrons was also discussed. It was observed that the calculated and the experimental values are in good agreement.
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    Investigation of the multipolarity of electromagnetic transitions in 88,90Kr nuclei
    (2006) Türkan, Nurettin; Olgun, Davut; Uluer, İhsan; İnan, Sait
    We have determined the most appropriate Hamiltonian that is needed for present calculations of nuclei about the A80 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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    Negative parity states and some electromagnetic transition properties of even-odd erbium isotopes
    (American Physical Soc, 2007) Yazar, Harun Reşit; Uluer, İhsan
    The negative parity states and some electromagnetic transition properties of even-odd erbium isotopes (Er-159,Er-161,Er-163,Er-165) were studied within the framework of the interacting boson-fermion model. The single fermion is assumed to be in one of the lh(9/2),3p(3/2),2f(5/2), and 3p(1/2) single-particle orbits. It was found that the calculated negative parity state energy spectra of the even-odd erbium isotopes agree quite well with the experimental data. The B(E2) values were also calculated and compared with the experimental data.
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    Some electromagnetic transition properties and mixing ratios of tellurium isotopes
    (Academic Journals, 2007) Yazar, Harun Reşit; Uluer, İhsan
    IBM-2 calculation is presented for the low-lying states in the even-even Te122-128 core nucleus. We developed the projection by using the F-spin formalism from the operator of IBA-2 model over the operator of IBA-1 model space. With the help of this projection IBA-2 Hamitonian parameters are obtained and we explore the energy levels and the electric quadrupole transition probabilities B (E2; I-i -> If) and gamma-ray E2/M1 mixing ratios for selected transitions. It was found that the calculated positive parity low spin state energy spectra of the even-even Te122-128 isotopes agree quite well with the experimental data.
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    Some Electromagnetic Transition Properties of Odd-A Europium Isotopes
    (Iop Publishing Ltd, 2010) Yazar, Harun Reşit; Uluer, İhsan; Ünaloğlu, Volkan; Yaşar, Sinan
    In this work, we analyze the positive parity of states of odd-A Eu isotopes within the framework of interacting boson fermion model (IBFM-1). The result of an IBFM-1 multilevel calculation with the 3s(1/2), 2d(3/2), 2d(5/2), and 1g(7/2) single particle orbits is reported for the positive parity states of the odd-A Eu isotopes. Also, an IBM-1 calculation is presented for the low-lying states in the even-even (152-154)Sm core nucleus. The energy levels and B(E2) transition probabilities are calculated and compared with the experimental data. It is found that the calculated positive parity low spin state energy spectra of the odd-A Eu isotopes agree quite well with the experimental data.