Browsing by Author "Atac, A."

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    Analysis and results of the Sn-104 Coulomb excitation experiment
    (2014) Atac, A.
    The analysis of the Coulomb excitation experiment conducted on Sn-104 required a strict selection of the data in order to reduce the large background present in the gamma-ray energy spectra and identify the gamma-ray peak corresponding to the Coulomb excitation events. As a result the B(E2; 0(+) -> 2(+)) value could be extracted, which established the downward trend towards Sn-100 and therefore the robustness of the N=Z=50 core against quadrupole excitations.
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    High-energy excited states in Cd-98
    (2010) Atac, A.; Fen Fakültesi
    In Cd-98 a new high-energy isomeric gamma-ray transition was identified, which confirms previous spin-parity assignments and enables for the first time the measurement of the E2 and E4 strength for the two decay branches of the isomer. Preliminary results on the Cd-98 high-excitation level scheme are presented. A comparison to shell-model calculations as well as implications for the nuclear structure around Sn-100 are discussed.
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    Isomer and beta-decay spectroscopy of T-z=1 isotopes below the N=Z=50 shell gap
    (2011) Atac, A.; Fen Fakültesi
    The RISING setup at the GSI-FRS facility was used to investigate the isomer and beta decays in N similar to Z similar to 50 Cd, Ag and Pd isotopes. A preliminary analysis of the data has revealed new results on the T-z=1, Pd-94, Ag-96 and Cd-98 isotopes. In Pd-94 a new high-spin isomer was observed, whilst in Ag-96 3 new isomeric states were identified, including core-excited states. In Cd-98 a new high-energy isomeric gamma-ray transition is observed, thus enabling us to confirm the previous spin assignment for the core-excited 12(+) isomer.
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    Spin-gap isomer in Cd-96
    (2012) Atac, A.; Kaskas, A.; Fen Fakültesi
    Evidence has been obtained for the existence of the long predicted (16+) spin-gap isomer in Cd-96. The decay of the isomer was identified and studied following the use of an 850 MeV/u beam of Xe-124 impinging on a Be target and the fragment recoil separator at the GSI Laboratory. Gamma decays from the fragments were detected using the RISING gamma ray array, in its stopped beam configuration, plus a silicon active stopper. The data obtained have been compared with shell model predictions, which indicate that the isoscalar neutron-proton interaction plays a key role in the formation of the isomer.