• D I Salamov

      Articles written in Pramana – Journal of Physics

    • An investigation of the influence of the pairing correlations on the properties of the isobar analog resonances inA = 208 nuclei

      A Kücükbursa D I Salamov T Babacan H A Aygör

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      Within the quasi-particle random phase approximation (QRPA), the method of the self-consistent determination of the isovector effective interaction which restores a broken isotopic symmetry for the nuclear part of the Hamiltonian is given. The effect of the pairing correlations between nucleons on the following quantities were investigated for theA = 208 nuclei: energies of the isobar analog 0+ states, the isospin admixtures in the ground state of the even-even nuclei, and the differential cross-section for the208Pb(3He,t)208Bi reaction atE(3He)=450 MeV. Both couplings of the excitation branches withTz = T0 ± 1, and the analog state with isovector monopole resonance (IVMR) in the quasi-particle representation were taken into account in our calculations. As a result of these calculations, it was seen that the pairing correlations between nucleons have no considerable effect on theT = 23 isospin admixture in the ground state of the208Pb nucleus, and they cause partially an increase in the isospin impurity of the isobar analog resonance (IAR). It was also established that these correlations have changed the isospin structure of the IAR states, and shifted the energies of the IVMR states to the higher values.

    • The isospin admixture of the ground state and the properties of the isobar analog resonances in medium and heavy mass nuclei

      D I Salamov T Babacan A Kücükbursa S Unlü I Mara˙s

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      Within the framework of quasiparticle random phase approximation (QRPA), Pyatov-Salamov method [23] for the self-consistent determination of the isovector effective interaction strength parameter, restoring a broken isotopic symmetry for the nuclear part of the Hamiltonian, is used. The isospin admixtures in the ground state of the parent nucleus, and the isospin structure of the isobar analog resonance (IAR) state were investigated with the inclusion of the pairing correlations between nucleons for the medium and heavy mass regions: 80 <A < 90, 102 <A < 124, and 204 <A < 214. It was determined that the influence of the pairing interaction between nucleons on the isospin admixtures in the ground state and the isospin structure of the IAR state is more pronounced for the light isotopes (N ≈ Z) of the investigated nuclei

    • Beta-transition properties for neutron-rich Sn and Te isotopes by Pyatov method

      D I Salamov S Unlu N Cakmak

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      Based on Pyatov's method, the low-lying Gamow–Teller (GT) 1+ state energies and log($f_{t}$) values for 128,130,132Sb and 132,134,136I isotopes have been calculated. In this method, the strength parameter of the effective spin–isospin interaction is found by providing the commutativity of the GT operator with the central part of the nuclear Hamiltonian. The problem has been solved within the framework of RPA. The calculation results have been compared with the corresponding experimental data.

    • The isospin mixing and the superallowed Fermi beta decay

      A E Çalik M Gerçekliğlu D I Salamov

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      In the present work, the isospin admixtures in the nuclear ground states of the parent nuclei and isospin structure of the isobar analog resonance (IAR) states have been investigated by studying the $0^{+} \rightarrow 0^{+}$ superallowed Fermi 𝛽 decays using Pyatov’s restoration method. Within the random phase approximation (RPA), in this method, the effect of isospin breaking due to the Coulomb forces has been evaluated, taking into account the effect of pairing correlations between nucleons.

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