Yazar "Yazar H.R." seçeneğine göre listele

Listeleniyor 1 - 4 / 4
  • Küçük Resim
    Öğe
    A correspondence between IBA-I and IBA-II model and electromagnetic transitions of some erbium isotopes
    (2007) Yazar H.R.; Uluer I.
    Since the lowest levels are symmetric under the interchange of neutrons and protons from calculations in the interacting boson approximation IBA-2 model, 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 by using the F-spin formalism. In the IBA-2, the lowest states are indeed fully symmetric, the calculations with the help of this projection, we explore the energy levels and the electric quadrupole transition probabilities B(E2;Ii ? If) and ?-ray E2/M1 mixing ratios for selected transitions of 166-168Er. Owing to admixtures of non-fully-symmetric states in IBA-2, we renormalized the parameters (?) and (?).This is the first time we show that this projection can be applied to some heavier isotopes and the results obtained for 166-168Er isotopes are reasonably in good agreement with the previous experimental values. © Association for Scientific Research.
  • Küçük Resim
    Öğe
    E2/M1 multipole mixing ratios of transitions in erbium isotopes
    (2004) Yazar H.R.; Uluer I.
    Erbium isotopes (Z = 64) lie in the transitional region that occurs at the middle of the range of deformed nuclei. ?-ray E2/M1 mixing ratios for selected transitions in 166-168Er are calculated in the proton-neutron interacting boson approximation(IBA-2). The results obtained for 166-168Er are reasonably in good agreement with the previous experimental and teoretical values.
  • Küçük Resim
    Öğe
    High-pressure phase transition in some alkali halides using interatomic potential model
    (2003) Yazar H.R.
    We have predicted the phase transition pressure in some alkali halides NaCl and KCl using an interatomic potential approach based on a rigid ion model. We have obtained phase transition pressures 28.69 and 2.4 GPa, respectively, and are in close agreement with their corresponding experimental transition pressures 29.0 and 2.0 GPa. This approach is promising with respect to the prediction of the phase transition pressures of other alkali halides.
  • Küçük Resim
    Öğe
    Second Order Elastic Constants and some thermoelastic properties of alkali halides using Woodcock potential
    (2001) Yazar H.R.; Ağan S.; Çolakoğlu K.
    Second Order Elastic Constants (S.O.E.C) of NaCl-type crystals have been calculated using the Woodcock potential. Short-range repulsive interactions have been included up to second-nearest neighbors. This potential form represents the composite form of the inverse power dependence and exponential dependence of the repulsive energy on interionic distance. Some thermoelastic and thermodynamic properties such as Anderson-Grüneisen parameters ?T, and ?S, Volume thermal expansion coefficient ? and Grüneisen gama ?G have been calculated in terms of calculated values of S.O.E.C and Third Order Elastic Constant (T.O.E.C).