Browsing by Author "Guclu, Mehmet C."

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    Article
    Citation - WoS: 6
    Citation - Scopus: 6
    Bound Free Electron-Positron Pair Production Accompanied by Giant Dipole Resonances
    (Amer Physical Soc., 2011) Şengül, Metin Y.; Şengül, Metin; Guclu, Mehmet C.
    At the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC) for example virtual photons produce many particles. At small impact parameters where the colliding nuclei make peripheral collisions photon fluxes are very large and these are responsible for the multiple photonuclear interactions. Free pair productions bound free pair productions and nuclear Coulomb excitations are important examples of such interactions and these processes play important roles in the beam luminosity at RHIC and LHC. Here we obtained the impact parameter dependence of bound free pair production cross sections and by using this probability we obtained bound free electron-positron pair production with nuclear breakup for heavy ion collisions at RHIC and LHC. We also compared our results to the other calculations.
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    Review
    Citation - WoS: 5
    Citation - Scopus: 5
    Relativistic Antihydrogen Production by Pair Production With Positron Capture
    (Elsevier Science Bv, 2012) Şengül, Metin Y.; Şengül, Metin; Guclu, Mehmet C.
    Antihydrogen atoms may rarely be produced by the collision of antiprotons with ions. At relativistic velocities the antiproton may pass around the Coulomb field of the nucleus and the electron-positron pairs can be produced electromagnetically. After this pair production not so often positron can be captured by the antiproton and as a result antihydrogen atoms may be produced. In this work we have calculated the antihydrogen production cross section in the framework of perturbation theory by applying Monte-Carlo integration techniques. In order to compute the lowest-order Feynman diagrams amplitudes we used Darwin wave functions for the bound states of the positrons and Sommerfeld-Maue wave functions for the continuum states of the electrons. (C) 2012 Elsevier B.V. All rights reserved.