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Title: Bound free electron-positron pair production accompanied by giant dipole resonances

Abstract

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.

Authors:
 [1];  [2];  [1]
  1. Istanbul Technical University, Faculty of Science and Letters, TR-34469 Istanbul (Turkey)
  2. (Turkey)
Publication Date:
OSTI Identifier:
21499354
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 83; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevC.83.014902; (c) 2011 American Institute of Physics
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; BEAM LUMINOSITY; BROOKHAVEN RHIC; CERN LHC; COULOMB EXCITATION; CROSS SECTIONS; DIPOLES; ELECTRON-POSITRON INTERACTIONS; GIANT RESONANCE; HEAVY ION REACTIONS; IMPACT PARAMETER; NUCLEI; PAIR PRODUCTION; PARTICLES; PERIPHERAL COLLISIONS; PHOTONS; PHOTONUCLEAR REACTIONS; PROBABILITY; RESONANCE; ACCELERATORS; BASIC INTERACTIONS; BOSONS; CYCLIC ACCELERATORS; ELEMENTARY PARTICLES; ENERGY-LEVEL TRANSITIONS; EXCITATION; HEAVY ION ACCELERATORS; INTERACTIONS; LEPTON-LEPTON INTERACTIONS; MASSLESS PARTICLES; MULTIPOLES; NUCLEAR REACTIONS; PARTICLE INTERACTIONS; PARTICLE PRODUCTION; STORAGE RINGS; STRONG INTERACTIONS; SYNCHROTRONS

Citation Formats

Senguel, M. Y., Kadir Has University, Faculty of Science and Letters, TR-34083 Cibali, Fatih-Istanbul, and Gueclue, M. C.. Bound free electron-positron pair production accompanied by giant dipole resonances. United States: N. p., 2011. Web. doi:10.1103/PHYSREVC.83.014902.
Senguel, M. Y., Kadir Has University, Faculty of Science and Letters, TR-34083 Cibali, Fatih-Istanbul, & Gueclue, M. C.. Bound free electron-positron pair production accompanied by giant dipole resonances. United States. doi:10.1103/PHYSREVC.83.014902.
Senguel, M. Y., Kadir Has University, Faculty of Science and Letters, TR-34083 Cibali, Fatih-Istanbul, and Gueclue, M. C.. Sat . "Bound free electron-positron pair production accompanied by giant dipole resonances". United States. doi:10.1103/PHYSREVC.83.014902.
@article{osti_21499354,
title = {Bound free electron-positron pair production accompanied by giant dipole resonances},
author = {Senguel, M. Y. and Kadir Has University, Faculty of Science and Letters, TR-34083 Cibali, Fatih-Istanbul and Gueclue, M. C.},
abstractNote = {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.},
doi = {10.1103/PHYSREVC.83.014902},
journal = {Physical Review. C, Nuclear Physics},
number = 1,
volume = 83,
place = {United States},
year = {Sat Jan 15 00:00:00 EST 2011},
month = {Sat Jan 15 00:00:00 EST 2011}
}
  • The bound-free electron-positron pair production is considered for relativistic heavy ion collisions. In particular, cross sections are calculated for the pair production with the simultaneous capture of the electron into the 1s ground state of one of the ions and for energies that are relevant for the relativistic heavy ion collider and the large hadron colliders. In the framework of perturbation theory, we applied Monte Carlo integration techniques to compute the lowest-order Feynman diagrams amplitudes by using Darwin wave functions for the bound states of the electrons and Sommerfeld-Maue wave functions for the continuum states of the positrons. Calculations weremore » performed especially for the collision of Au+Au at 100 GeV/nucleon and Pb+Pb at 3400 GeV/nucleon.« less
  • The angular and energy distribution of electron-positron pairs and of the scattered gamma quanta in the gamma + (Ze) yields (Ze), + gamma ' + e/ sup +/ + e/sup -/ reaction is investigated by taking into account the polarizations of all the particles. The degrees of polarization of the pair and scattered gamma quantum are determined. (auth)
  • Inelastic photon scattering on a Coulomb field involving electron- positron pair production is analyzed by means of the Weizsacker-Williams method. It is found that scattering into small angles is much greater thanthe correction to the Compton effect on protons due to the proton polarizability. (auth)
  • A semimicroscopic approach based on the continuum version of the random-phase approximation (CRPA) and on a semiphenomenological inclusion of the fragmentation effect is applied to describing cross sections for photoabsorption and direct plus semidirect and inverse reactions accompanied by the excitation of isovector giant dipole and quadrupole resonances. In addition to the spinless part of the Landau-Migdal interaction and a partly self-consistent phenomenological mean field of the nucleus, that version of the approach which is used here takes into account isovector separable velocity-dependent forces, as well as the effect of the fragmentation shift of the giant-resonance energy. The results obtainedmore » by calculating various features of the aforementioned cross sections for a number of magic and semimagic medium-mass nuclei are compared with respective experimental data.« less
  • Using a first-order distorted-wave Born approximation we examine the creation of bound-free electron-positron pairs in relativistic heavy-ion collisions. We consider this process as the transfer of a negative-energy electron in the Coulomb field of one of the colliding ions to a bound state of the other. We calculate differential and integral cross sections for various collision systems by employing exact relativistic single-electron wave functions in momentum space. Our results confirm the experimentally reported increase of cross sections with increasing collision energy and their unexpected strong dependence on the charge number of the ion which captures the electron. The calculated dependencemore » on the charge number of the other colliding partner is, however, weaker than experimentally reported. A major conclusion of this investigation is that at least at moderate relativistic collision energies distortions of electronic states due to both Coulomb centers are important for this process. {copyright} {ital 1996 The American Physical Society.}« less