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Author : Mark Raymond Wolanski
Publisher :
ISBN 13 :
Total Pages : 398 pages
Book Rating : 4.:/5 (784 download)
Download or read book An Investigation of Positron-electron Pair Emission from Heavy-ion Collisions written by Mark Raymond Wolanski and published by . This book was released on 1995 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 107 pages
Book Rating : 4.:/5 (16 download)
Download or read book Electron-positron Production in Ultra-peripheral Heavy-ion Collisions with the STAR Experiment written by and published by . This book was released on 2003 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a measurement of the cross-section of the purely electromagnetic production of e+e- pairs accompanied by mutual nuclear Coulomb excitation AuAu → Au*Au* + e+e-, in ultra-peripheral gold-gold collisions at RHIC at the center-of-mass collision energy of √SNN = 200 GeV per nucleon. These reactions were selected by detecting neutron emission by the excited gold ions in the Zero Degree Calorimeters. The charged tracks in the e+e- events were reconstructed with the STAR Time Projection Chamber. The detector acceptance limits the kinematical range of the observed e+e- pairs; therefore the measured cross-section is extrapolated to 4? with the use of Monte Carlo simulations. We have developed a Monte Carlo simulation for ultra-peripheral e+e- production at RHIC based on the Equivalent Photon Approximation, the lowest-order QED e+e- production cross-section by two real photons and the assumption that the mutual nuclear excitations and the e+e- production are independent (EPA model). We compare our experimental results to two models: the EPA model and a model based on full QED calculation of the e+e- production, taking the photon virtuality into account. The measured differential cross-section d?/dMinv (Minv - e+e- invariant mass) agrees well with both theoretical models. The measured differential cross-section d?/dp $tottop{perp}$ (p$tottop{perp}$- e+e- total transverse momentum) favors the full QED calculation over the EPA model.
Author : Gerhard Baur
Publisher :
ISBN 13 :
Total Pages : 27 pages
Book Rating : 4.:/5 (749 download)
Download or read book Electron-positron Pair Production in Ultrarelativistic Heavy Ion Collisions written by Gerhard Baur and published by . This book was released on 2007 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Gesellschaft für Schwerionenforschung
Publisher :
ISBN 13 :
Total Pages : 15 pages
Book Rating : 4.:/5 (256 download)
Download or read book Correlated Electron-positron Emission in Heavy-ion Collisions written by Gesellschaft für Schwerionenforschung and published by . This book was released on 1989 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Piotr Salabura
Publisher :
ISBN 13 :
Total Pages : 152 pages
Book Rating : 4.:/5 (612 download)
Download or read book GSI 90 06 Report written by Piotr Salabura and published by . This book was released on 1990 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (685 download)
Download or read book Positron Production in Heavy Ion Collisions written by and published by . This book was released on 1994 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Narrow peaks have been observed at GSI Darmstadt in the energy spectra of positrons and sum-energy spectra of positron-electron pairs, produced in collisions of very heavy ions. To date, there is no satisfactory explanation of the origin of these lines although many differing models have been proposed. In this contribution, the authors describe the features of a new experiment aimed at the study of the line phenomenon and present the results of their first experiments. The specific goals of their experiment are to clarify the experimental situation regarding the lines through high-resolution, high-statistics data and, by direct measurement of the vector momenta of the peak pairs, to determine their kinematics.
Author :
Publisher :
ISBN 13 :
Total Pages : 12 pages
Book Rating : 4.:/5 (684 download)
Download or read book Light-fronts Approach to Electron-positron Pair Production in Ultrarelativistic Heavy-ion Collisions written by and published by . This book was released on 1998 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors solve, in an ultrarelativistic limit, the time-dependent Dirac equation describing electron-positron pair production in peripheral relativistic heavy ion collisions using light front variables and a light-fronts representation, obtaining nonperturbative results for the free pair-creation amplitudes in the collider frame. Their result reproduces the result of second-order perturbation theory in the small charge limit while nonperturbative effects arise for realistic charges of the ions.
Author : H. Bokemeyer
Publisher :
ISBN 13 :
Total Pages : 61 pages
Book Rating : 4.:/5 (256 download)
Download or read book Investigation of Positron Line Emission in Heavy Ion Collisions with the Epos-spectrometer written by H. Bokemeyer and published by . This book was released on 1987 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Nicholas Ioannis Koloskamis
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (72 download)
Download or read book APEX: An Experiment to Study Correlated Positron-electron Production in Heavy Ion Collisions written by Nicholas Ioannis Koloskamis and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Carsten Kallesø Agger
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (474 download)
Download or read book The Theory of Electron Positron Pair Creation with Bound Electron for Photon Impact on Heavy Nuclei and a Discussion of Application to Bound-free Pair Production in Energetic Heavy-ion Collisions written by Carsten Kallesø Agger and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Denis Carrier
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (72 download)
Download or read book Narrow, Coincident Electron-Positron Pair Conversion Peaks in Heavy-Ion Collisions written by Denis Carrier and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ana Cecilia De Azevedo E Souza
Publisher : World Scientific
ISBN 13 : 9814555355
Total Pages : 514 pages
Book Rating : 4.8/5 (145 download)
Download or read book Collision Processes Of Ion, Positron, Electron And Photon Beams With Matter - Proceedings Of Elaf 91 written by Ana Cecilia De Azevedo E Souza and published by World Scientific. This book was released on 1992-04-30 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proceedings contain lectures and contributed papers presented at the Latin American School of Physics in Caxambu, Brazil. Topics are related to a review of collision processes, excitation and ionization of molecules, ion formation by electron impact, mass and energy spectroscopy in collision reactions, desorption induced by ion and electron beams, and principles and applications of synchrotron radiation. The major theme of the school was “Current methods in collision processes.”
Download or read book Anomalous Positrons from Heavy Ion Collisions written by and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The current status of the experimental study of anomalous lines observed in the spectra of positrons produced in heavy ion collisions is reviewed. A new experiment to measure positron-electron coincidences is discussed. 26 refs., 14 figs., 2 tabs.
Author :
Publisher :
ISBN 13 :
Total Pages : 486 pages
Book Rating : 4.0/5 ( download)
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994-11 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kai Hencken
Publisher :
ISBN 13 :
Total Pages : 109 pages
Book Rating : 4.:/5 (64 download)
Download or read book Electromagnetic Production of Electron Positron Pairs in Relativistic Heavy Ion Collisions written by Kai Hencken and published by . This book was released on 1994 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Stefan Schramm
Publisher : Springer
ISBN 13 : 3319441655
Total Pages : 381 pages
Book Rating : 4.3/5 (194 download)
Download or read book New Horizons in Fundamental Physics written by Stefan Schramm and published by Springer. This book was released on 2016-11-11 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents the state-of-the-art in selected topics across modern nuclear physics, covering fields of central importance to research and illustrating their connection to many different areas of physics. It describes recent progress in the study of superheavy and exotic nuclei, which is pushing our knowledge to ever heavier elements and neutron-richer isotopes. Extending nuclear physics to systems that are many times denser than even the core of an atomic nucleus, one enters the realm of the physics of neutron stars and possibly quark stars, a topic that is intensively investigated with many ground-based and outer-space research missions as well as numerous theoretical works. By colliding two nuclei at very high ultra-relativistic energies one can create a fireball of extremely hot matter, reminiscent of the universe very shortly after the big bang, leading to a phase of melted hadrons and free quarks and gluons, the so-called quark-gluon plasma. These studies tie up with effects of crucial importance in other fields. During the collision of heavy ions, electric fields of extreme strength are produced, potentially destabilizing the vacuum of the atomic physics system, subsequently leading to the decay of the vacuum state and the emission of positrons. In neutron stars the ultra-dense matter might support extremely high magnetic fields, far beyond anything that can be produced in the laboratory, significantly affecting the stellar properties. At very high densities general relativity predicts the stellar collapse to a black hole. However, a number of current theoretical activities, modifying Einstein’s theory, point to possible alternative scenarios, where this collapse might be avoided. These and related topics are addressed in this book in a series of highly readable chapters. In addition, the book includes fundamental analyses of the practicalities involved in transiting to an electricity supply mainly based on renewable energies, investigating this scenario less from an engineering and more from a physics point of view. While the topics comprise a large scope of activities, the contributions also show an extensive overlap in the methodology and in the analytical and numerical tools involved in tackling these diverse research fields that are the forefront of modern science.
Author : P. Kienle
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (256 download)
Download or read book Electron-positron-paircreation in Heavy Ion Collisions written by P. Kienle and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
