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Author :
Publisher :
ISBN 13 :
Total Pages : 134 pages
Book Rating : 4.:/5 (72 download)
Download or read book Theory of positron production in heavy ion collision written by and published by . This book was released on 1978 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.:/5 (929 download)
Download or read book Quantum Mechanical Theory of Positron Production in Heavy Ion Collisions with Nuclear Contact written by and published by . This book was released on 1986 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quantum Mechanical Theory of Positron Production in Heavy Ion Collisions with Nuclear Contact written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The interplay between atomic and nuclear interactions in heavy ion collisions with nuclear contact is studied. The general theoretical description is outlined and analyzed in a number of different limits (semiclassical approximation, DWBA, fully quantal description). The two most important physical mechanisms for generating atomic-nuclear interference, i.e., energy conservation and the introduction of additional phase shifts by nuclear reactions, are extracted. The resulting typical coupling matrix elements are analyzed for their relative importance in atomic and nuclear excitations. The description of nuclear influence on atomic excitations in terms of a classical time delay caused by nuclear reactions is reviewed, and its relationship to the underlying quantal character of the nuclear reaction is discussed. The theory is applied to spontaneous positron emission in supercritical heavy-ion collisions (Z/sub tot/ greater than or equal to 173). It is shown that nuclear contact can lead to line structures in the positron energy spectra if the probability distribution for nuclear delay times caused by the contact has contributions for T greater than or equal to 10−19 sec. We explicitly evaluate a model where a pocket in the internuclear potential near the touching configuration leads to formation of nuclear molecules, and predict a resonance-like excitation function for the positron peak. 25 refs., 7 figs.
Author : H. Backe
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (254 download)
Download or read book Positron Production in Heavy Ion Collisions written by H. Backe and published by . This book was released on 1977 with total page 14 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:
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ISBN 13 :
Total Pages : 167 pages
Book Rating : 4.:/5 (88 download)
Download or read book Positron Production in Heavy Ion Collisions: Current Status of the Problem-II. written by and published by . This book was released on 1994 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ATLAS Positron Experiment APEX was built to study positron emission in collisions between very heavy ions. Narrow peaks were observed in such collisions at GSI, Darmstadt in the spectra of positrons and in the sum-energy spectra of electron-positron coincidences. APEX is a second-generation experiment which was specifically designed to look for the coincidence events and measure the opening angle between electrons and positrons. The first beam-induced positrons were detected using APEX in March 1993, and since then three additional runs were carried out. The first results for the collision system 238U + 181Ta show no evidence for sharp peaks in the electron-positron sum-energy spectrum. The current emphasis in this work is to obtain a complete understanding of the APEX apparatus. The atomic group is studying events involving coincidences between heavy ions and electrons. Since APEX measures the laboratory angles and energies of both electrons and heavy ions, it is possible to make an event-by-event Doppler correction of the electron spectra. These Doppler-corrected spectra show a number of lines which are attributed to conversion electrons which are emitted when a nuclear excited state decays by ejecting an inner-shell electron. The study of these spectra provide an important confirmation of the proper functioning of APEX. We are particularly concerned with the atomic physics aspects of this process. In order to understand the electron spectra, it is necessary to account for the change in binding energy of the inner-shell electrons as a function of ionic charge. We are utilizing the GRASP relativistic atomic structure program to calculate the binding energies. This information, together with the measured gamma-ray energies, allows us to calculate the expected energies of the conversion electrons which we can then compare with the observed Doppler-corrected conversion electron energies.
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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (88 download)
Download or read book A New Look at Positron Production from Heavy-ion Collisions: Results from Apex written by and published by . This book was released on 1995 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : P. Kienle
Publisher :
ISBN 13 :
Total Pages : 30 pages
Book Rating : 4.:/5 (245 download)
Download or read book Positron Production in Heavy Ion-atom Collisions written by P. Kienle and published by . This book was released on 1985 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Systematic Studies of Positron Production in Heavy-ion Collisions Near the Coulomb Barrier written by and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : K. Rumrich
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (256 download)
Download or read book The Influence of Strong Magnetic Fields on Positron Production in Heavy-ion Collisions written by K. Rumrich and published by . This book was released on 1987 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 : Haralabos Tsertos
Publisher :
ISBN 13 :
Total Pages : 37 pages
Book Rating : 4.:/5 (18 download)
Download or read book Systematic Studies of Positron Production in Heavy Ion Collisions Near the Coulomb Barrier written by Haralabos Tsertos and published by . This book was released on 1991 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : D.A. Bromley
Publisher : Springer
ISBN 13 : 9780306415753
Total Pages : 528 pages
Book Rating : 4.4/5 (157 download)
Download or read book Treatise on Heavy Ion Science written by D.A. Bromley and published by Springer. This book was released on 1985-05-31 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : D.A. Bromley
Publisher : Springer Science & Business Media
ISBN 13 : 1461581001
Total Pages : 514 pages
Book Rating : 4.4/5 (615 download)
Download or read book Treatise on Heavy Ion Science written by D.A. Bromley and published by Springer Science & Business Media. This book was released on 2012-11-27 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Derrick S.F. Crothers
Publisher : Springer Science & Business Media
ISBN 13 : 1461542758
Total Pages : 313 pages
Book Rating : 4.4/5 (615 download)
Download or read book Relativistic Heavy-Particle Collision Theory written by Derrick S.F. Crothers and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: If a heavy particle ion (atom, molecule, muon) collides with another in the gas phase at speeds approaching the speed of light, the time-dependent Dirac equation equation must be used for its description, including quantum electro-dynamic, special relativity and magnetic coupling effects. In this book we study one electron in the variety of rearrangement collisions: radiative and non-radiative capture, ionization, capture by pair (one electron, one positron) production and antihydrogen production. Our relativistic continuum distorted-wave theory accounts extremely well for the simultaneous behaviour of the electron with respect to the nuclear charges of the projectile and the target. This is the first book developed in this subject. Containing many diagrams and tables, and fully referenced, it goes beyond chapters in previous books. The relativistic continuum distorted-wave theory developed by the authors group, is shown to be fully Hermitean. Detailed mathematics are provided in nine appendices.
Download or read book Possibility of New Particle Production in Heavy-ion Collisions written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-body decay of a particle is hypothesized in order to explain the lack of strong Z dependence of positron emission spectra in low-energy heavy ion collisions. The consequences of such a hypothesis are discussed, as well as recent theoretical and experimental work motivated by it. 50 refs. (LEW).
Author : John Edward Schweppe
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (72 download)
Download or read book A Search for Spontaneous Positron Production in Heavy Ion-Atom Collisions written by John Edward Schweppe and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
