[en] We investigate the effects of scalar and vector unparticles on top quark spin correlations via the process e⁺e^-→tt^-. In addition to the Standard Model diagrams, there is a new contribution to top-antitop quark production process mediated by unparticle in the s-channel. If the top quark is coupled to a new physics beyond the Standard Model, the top-antitop quark spin correlations could be altered. Therefore, these correlations can provide useful information to probe possible new physics effects. It is shown that scalar and vector unparticle contributions lead to considerable deviations of the top spin correlations from the Standard Model one.

[en] We investigate the potential of eγ collisions to probe anomalous Wtb couplings via the polarized single top quark production process e⁺γ→t anti b anti ν_e. We find 95% confidence level limits on the anomalous coupling parameters F_2L and F_2R with an integrated luminosity of 500 fb^-1 and √(s)=0.5, 1 and 1.5 TeV energies. The effects of top quark spin polarization on the anomalous Wtb couplings are discussed. It is shown that polarization leads to a considerable improvement in the sensitivity limits. (orig.)

[en] We investigate the virtual effects of vector unparticles in Moeller scattering. We derive the analytic expression for scattering amplitudes with unpolarized beams. We obtain 95% confidence level limits on the unparticle couplings λ_V and λ_A with integrated luminosity of L_int=50,500 fb^-1 and √(s)=100, 300 and 500 GeV energies. We show that limits on λ_V are more sensitive than λ_A. (orig.)

[en] In our previous work [Phys. Rev. D 70, 037503 (2004)] for the e⁺p→tν+X process, we have shown that the top quark possesses a high degree of spin polarization when its spin decomposition axis is along the incoming lepton beam. In this work, the potential of ep collisions to probe an anomalous Wtb vertex is investigated via the polarized single top quark production process for TESLA+HERAp energy. The effects of the top quark polarization to Wtb couplings F_2L and F_2R are discussed. It is possible to define a polarization axis for the top quark that is more sensitive to new physics than the unpolarized case

[en] The costs of nuclear power are discussed with special reference to the economic problems faced by developing countries, and the relative merit of a new accounting approach, viz., the build, operate, transfer contract model, which was proposed in Turkey for the Akkuyu nuclear power project, is illustrated. In this context, the general methodology of calculating nuclear power costs is summarized and a capital cost analysis for a 986 MW pressurized water reactor plant is given in terms of constant monetary units for the above contract model and the turnkey contract model. Adjustment of the costs taking into account regional conditions such as inflation and higher interest rates is also indicated. (orig.)

[en] For best patient service, a QA programme is needed to produce quantitative/qualitative data and keep records of the results and equipment faults. Gamma cameras must be checked against the manufacturer's specifications.The service manual is usually useful to achieve this goal. Acceptance tests are very important not only to accept a new gamma camera system for routine clinical use but also to have a role in a reference for future measurements. In this study, acceptance tests were performed for a new gamma camera in our department. It is a General Electric MG system with two detectors, two collimators. They are low energy general purpose (LEGP) and medium energy general purpose (MEGP). All intrinsic calibrations and corrections were done by the service engineer at installation (PM tune, dynamic correction, energy calibration, geometric calibration, energy correction, linearity correction and second order corrections).After installation, calibrations and corrections, a close physical inspection of the mechanical and electrical safety aspects of the cameras were done by the responsible physicist of the department. The planar system is based on measurement of system uniformity, resolution/linearity and multiple window spatial registration. All test procedures were performed according to NEMA procedures developed by the manufacturer. Intrinsic uniformity: NEMA uniformity was done first by using service manual and then other isotope uniformities were acquired with ^99mTc, ¹³¹I, ²⁰¹Tl and ⁶⁷Ga. They were evaluated qualitatively and quantitatively, but non-uniformities were observed, especially for detector II, The service engineers repeated all tests and made necessary corrections. We repeated all the intrinsic uniformity tests. ^99mTc intrinsic images were also performed at 'no correction', 'no energy correction', 'no linearity correction', 'all correction' and '±10% off peak', and compared. Extrinsic uniformity: At the beginning, collimators were checked for defects visually and Co- 57 sheet source check was done, LEGP, MEGP collimators, 128x128 matrix, 120M counts. Single defect was observed in one of the LEGP collimators. This collimator has been replaced by the manufacturer. A collimator test was also done by a point source at 10 million counts for each collimator. Images from both collimators show the expected pattern of counts, indicating that the holes are perpendicular and parallel. Resolution and linearity: Quantitative measurement of intrinsic resolution and linearity were done by NEMA linearity phantom. Resolution and linearity values were good and it was within the manufacturer's specifications limits. These are given in Tables 1 and 2. Qualitative intrinsic and extrinsic resolutions were done using bar quadrant phantom with point source and Co-57 sheet source respectively. Quantitative resolution was done by using two capillary tubes with 512x512 matrixes, zoom: 2. FWHM was then calculated. Multiple window spatial registration, quantitative analysis was performed using the NEMA method in the acquisition system which was developed by the manufacturer. Sensitivity was obtained by using a Petri dish and then it was calculated in the units of (count/second)/MBq. Whole body scan was done with Co-57 sheet source. The poor images obtained at the beginning became better after the PMT gain adjustment and corrections were done by the service engineer. Pixel size was obtained by using line source, and it was calculated. Tomographic system is based on measurement of resolution, uniformity and centre of rotation. Centre of rotation was done with point source and was within the acceptable limits. An overall assessment of system performance was obtained by Jaszczak phantom. The phantom was filled with 444 MBq ^99mTc. It was imaged under ideal conditions, i.e. minimum radius of rotation, LEGP collimator, and 128x128 matrices, with 120 views, zoom 1.0 and zoom 1.33. All conditions were taken from the service manual. After acquisition, optimal good image and attenuation conditions were determined. Finally, reconstructions were done by using ramp, Hanning filter with cut-off 1.0. Chang's attenuation correction was used at threshold: 20, and coefficient: 0.105 setting and single pixel thick slices through the uniform section of the phantom was evaluated. In spite of uniformity correction, ring artefact was observed. Resolution elements were evaluated for tomographic resolution. It was evaluated for zoom 1.0. But for zoom 1.33 '+' shaped artefact in the saggital and coronal slices was observed. Uniformity was performed with Co-57 sheet source at zoom 1.33. '+' shaped artefact insisted. The service engineer could not help and the production manager decided that they had a software problem for zoom 1.33. After they developed a new software, all tomographic acquisitions were repeated. No artefacts were observed. The acceptance tests performed on a General Electric MG system gamma camera were found within specified limits by the manufacturer except a '+' shaped artefact due to a software problem. This study emphasizes the importance of a newly acquired gamma camera in a Nuclear Medicine department for acceptance tests in the QA programme

[en] The transparent conducting un-doped, Cd_0.99 Mn_0.01O (Mn: 1.0%) and Mn/Cu co-doped CdO [(Cu_xMn_0.01Cd_0.99-x) (x: 0.005, 0.01 and 0.02 respectively)] films were prepared by successive ionic layer adsorption and reaction (SILAR) technique on soda lime glass substrates. The effect of Mn and Cu-dopant on structural, morphological and optical characteristics of the CdO films was analyzed by XRD, SEM, UV–Visible spectrophotometer and FT-IR spectroscopy. The XRD studies showed that the all-SILAR prepared films were polycrystalline and had preferential growth along the (111) directions. SEM analysis revealed that the Mn doping and Mn/Cu co-doping significantly influenced the surface morphologies of the CdO films. The EDX results confirmed that the dopant ions were incorporated properly into the CdO lattices. The optical band gap energy values of the all deposited films were determined by extrapolation method and observed to be in the range of 2.08–2.38 eV. Optical analysis results disclosed that doping alters the band gap facilitating the potential of transparent conductive films to be exploited in optoelectronic devices. Furthermore, FT-IR was used to confirm the existence of metal-doped CdO. The investigations showed that co-doping significantly affects the physical properties of SILAR-grown CdO films.

[en] Highlights: • We synthesized nanostructured CdO films without and with TEA as a surfactant agent by using SILAR method. • The influences of TEA concentration on the surface topography of CdO samples are investigated. • Crystalline properties and bandgap energies of CdO nanostructures were notably changed depending on the TEA concentration. - Abstract: Nanostructured CdO films have been successfully synthesized with different ratios of surfactant triethanolamine (TEA) under SILAR condition. The influence of addition of TEA on the physical properties of CdO nanoparticles was studied. The surface morphology of the films was studied by metallurgical microscope and SEM analysis. Surface topography of the film was studied by AFM. The structural properties of the samples were studied by X-ray diffraction (XRD). The XRD studies confirm that the deposited CdO films has cubic structure (111) preferred orientation with well-crystallinity and purity. The optical bandgap energy was estimated based on the UV–vis spectroscopies which were obtained in the range of 2.16 eV–2.46 eV. Our study is encouraging to get enhanced surface topography by surfactant TEA.

[en] In this present study nanostructured dually doped samples of Cd_1−x−yMg_xM_yO (M: Sn, Pb, Bi) are synthesized by SILAR method. The effects of the mono and dual doping on the structural, morphological and optoelectronic characteristics of CdO nanoparticles are examined. The SEM images verify that deposited CdO films are nano-sized. Also the SEM computations demonstrated that the morphological surface structures of the films were influenced from the Mg mono doping and (Mg, Sn), (Mg, Pb) and (Mg, Bi) dual doping. The XRD designs specified that all the CdO samples have polycrystalline structure exhibiting cubic crystal form with dominant peaks of (111) and (220). The results display that Mg and (Mg, Sn), (Mg, Pb) and (Mg, Bi) ions were successfully doped into CdO film matrix. The UV spectroscopy results show that the optical energy band gap of the CdO films, ranging from 2.21 to 2.66 eV, altered with the dopant materials. (paper)

[en] Capability of medium energy setup of a beta beam experiment to probe new physics contributions to neutrino-W and neutrino-Z couplings are investigated. We employ the effective lagrangian approach of Buchmuller and Wyler and obtain 95% confidence level limits on neutrino couplings to these gauge bosons without assuming the flavor universality of the coupling of neutrinos. We show that a beta beam facility with a systematic error of 2% can place 10 times more restrictive limit than present one on the deviations from the electron neutrino-Z couplings in the Standard Model.