Production of Pions in Heavy Ion Reactions Below 500 MeV/nucleon
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Published: 1979
Total Pages: 4
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Author:
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Published: 1979
Total Pages: 4
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Published: 1984
Total Pages:
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DOWNLOAD EBOOKPion production in heavy ion collisions at energies below the free nucleon-nucleon threshold, i.e., at energies, where the pion mass exceeds the kinetic energy of a projectile nucleon in the zero momentum frame, has been discussed for a long time in terms of probing the intrinsic Fermi motion in the projectile and target nuclei. However, as the beam energy is lowered, this process gets more and more unlikely and below a certain energy it should not be observed anymore. In a sharp cut-off Fermi gas model this occurs at E/sub lab/=50 MeV/u. However, as long as the total center of mass energy exceeds the pion mass, pions still can be produced by a cooperative sharing of the beam energy of several (or all) projectile nucleons. The experiments presented here are meant to extend the experimental information into that kinematic domain and represent the up to now lowest beam energy, where pion production has been identified unambiguously. The production of a pion of 100 MeV kinematic energy with a 35 MeV/u 14N beam requires Fermi momenta as high as approx. 350 MeV/c or alternatively 60% of the total beam energy. The information from the present experiments together with the results of previous experiments at higher beam energies of 44 MeV/u and 60 to 84 MeV/u allows one to distinguish between the alternative production mechanisms.
Author: Rune Kullberg
Publisher:
Published: 1977
Total Pages: 22
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Published: 1976
Total Pages: 612
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DOWNLOAD EBOOKAuthor: Jia-jih Lu
Publisher:
Published: 1979
Total Pages: 448
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DOWNLOAD EBOOKAuthor: Jose Diaz
Publisher: World Scientific
Published: 1994-10-25
Total Pages: 626
ISBN-13: 9814550868
DOWNLOAD EBOOKThese proceedings treat the production of high energy gamma rays and particles (mesons and dileptons) in heavy ion reactions from energies of about 30 MeV·A to a few GeV·A, and its application to the study of the Nuclear Equation of State from both the experimental and theoretical points of view. Giant resonances, intensity interferometry, meson fotoproduction and applications of intermediate energy heavy ion beams are also discussed.
Author: Jack Miller
Publisher:
Published: 1987
Total Pages: 460
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Published: 1981
Total Pages:
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DOWNLOAD EBOOKDouble 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.
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Published: 1994-05
Total Pages: 438
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DOWNLOAD EBOOKAuthor: Bo Jakobsson
Publisher:
Published: 1977
Total Pages: 48
ISBN-13:
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