Coulomb Effects on Pions Produced in Heavy-ion Reactions

Coulomb Effects on Pions Produced in Heavy-ion Reactions

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Published: 1981

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Double differential cross sections for the production of .pi. and .pi.− near the velocity of the incident beam for pion lab angles less than 40 degrees are presented. The experimental apparatus and the techniques are discussed. Beams of 2°Ne with E/A from 80 to 655 MeV and 4°Ar with E/A = 535 MeV incident on Be, C, NaF, KC1, Cu, and U targets were used. A sharp peak in the .pi.− spectrum and a depression in the .pi. spectrum were observed at zero degrees near the incident beam velocity. The effect is explained in terms of Coulomb interactions between the pions and fragments of the incident beam. Least squares fits to the data using the Coulomb correction formulas of Gyulassy and Kauffman and an effective projectile fragment charge are made. The relationship between these data and previously measured pion production and projectile fragmentation data is discussed. The data are also compared to some theoretical models. A simple expression is given for the differential cross section as a function of the projectile mass, target mass, and beam energy.


Strong Coulomb Effects on Pions Produced in Heavy Ion Collisons

Strong Coulomb Effects on Pions Produced in Heavy Ion Collisons

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Published: 1982

Total Pages: 19

ISBN-13:

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We present doubly differential cross sections for the production of [pi]+ and [pi]- near the velocity of the incident beam for pion laboratory angles from 0 to 20 degrees. Beams of 20Ne with E/A=280, 380, and 480 MeV and 40Ar with EA=535 MeV incident on C, NaF, KCl, Cu, and U targets were used. A sharp peak in the [pi]- spectrum and a depression in the [pi]+ spectrum is observed at 0° near the incident projectile velocity. The effect is explained in terms of Coulomb interactions between pions and fragments of the incident beam. Least squares fits to the data using the Coulomb correction formulas of Gyulassy and Kauffmann and an effective projectile fragment charge are made. In conclusion, the relationship between these data and previously measured projectile fragmentation data is discussed and a simple parametrization of projectile mass, target mass, and beam energy dependence of the differential cross sections is given.


Heavy Ion Pion Production

Heavy Ion Pion Production

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Published: 1982

Total Pages:

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Data on .pi.−/.pi./sup +/ ratios and on hills and valleys in spectra from heavy ion collisions are reviewed. Theoretical studies to handle Coulomb effects on pion spectra are examined. The possible role of strongly-bound pion orbitals of nuclear size is discussed.


Introduction to Relativistic Heavy Ion Physics

Introduction to Relativistic Heavy Ion Physics

Author: Jerzy Bartke

Publisher: World Scientific

Published: 2009

Total Pages: 239

ISBN-13: 9810212313

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This book attempts to cover the fascinating field of physics of relativistic heavy ions, mainly from the experimentalist's point of view. After the introductory chapter on quantum chromodynamics, basic properties of atomic nuclei, sources of relativistic nuclei, and typical detector set-ups are described in three subsequent chapters. Experimental facts on collisions of relativistic heavy ions are systematically presented in 15 consecutive chapters, starting from the simplest features like cross sections, multiplicities, and spectra of secondary particles and going to more involved characteristics like correlations, various relatively rare processes, and newly discovered features: collective flow, high pT suppression and jet quenching. Some entirely new topics are included, such as the difference between neutron and proton radii in nuclei, heavy hypernuclei, and electromagnetic effects on secondary particle spectra.Phenomenological approaches and related simple models are discussed in parallel with the presentation of experimental data. Near the end of the book, recent ideas about the new state of matter created in collisions of ultrarelativistic nuclei are discussed. In the final chapter, some predictions are given for nuclear collisions in the Large Hadron Collider (LHC), now in construction at the site of the European Organization for Nuclear Research (CERN), Geneva. Finally, the appendix gives us basic notions of relativistic kinematics, and lists the main international conferences related to this field. A concise reference book on physics of relativistic heavy ions, it shows the present status of this field.


Scientific and Technical Aerospace Reports

Scientific and Technical Aerospace Reports

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Published: 1983

Total Pages: 724

ISBN-13:

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Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.