Browsing by Author "Cakmak N."

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    The investigation of the 2νββ decay by Pyatov method within quasiparticle random phase approximation formalism
    (2008) Unlu S.; Babacan T.; Cakmak N.; Selam C.
    The violated commutation condition between the total shell model Hamiltonian and Garnow-Teller operator (GT) has been restored by Pyatov method (PM). The considered nuclear model Hamiltonian in PM includes the separable GT residual interaction in ph and pp channels and is differentiated from the traditional schematic model by ho (restoration term). The influence of the ho effective interaction on the 2νββ decay of 48Ca, 70Ge, 82Se, 96Zr, 100Mo, 116Cd, 128,130Te and 136Xe is investigated. All the calculations have been done within the framework of standard QRPA. The results obtained by PM are compared with those of other approaches and experimental data. The influence of the restoration term on the stability of the 2νββ decay nuclear matrix elements is analysed. © Indian Academy of Sciences.
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    The isospin admixture of the ground state and the properties of the isobar analog resonances in deformed nuclei
    (American Institute of Physics Inc., 2008) Aygor H.A.; Cakmak N.; Maras I.; Selam C.
    Within quasiparticle random phase approximation (QRPA), Pyatov-Salamov method 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 are investigated by including the pairing correlations between nucleons for 72-80Kr isotopes. Our results are compared with the spherical case and with other theoretical results. © 2008 American Institute of Physics.