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Languages : en
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The theoretical description of pion-nucleus interactions, specifically in the intermediate-energy region dominated .delta.-excitation, is discussed. Attention is focused on the interaction with and propagation through the nucleus of pions and .delta.'s. The approach followed basically consists of viewing the .delta.-nucleus system, formed by pion excitation of a nucleon, as a doorway for the pion-nucleus reaction. Analysis of the interacting .delta.-nucleus system then leads to new dynamical information summarized in a complex .delta.-nucleus interaction potential. The associated nuclear medium corrections to .delta. propagation, related in more conventional language to higher-order corrections in the pion optical potential, are so large as to demand consideration in quantitative studies of nuclear structure with pions. After a discussion of the basic scale parameters characterizing intermediate-energy pion-nucleus interactions, the author discusses the theoretical framework and the extraction of .delta. interaction parameters from inclusive pion-nucleus cross sections. More detailed tests of the picture, such as elastic scattering angular distributions, are then discussed. Finally, some implications for intermediate-energy photoreactions are outlined. 11 figures. (RWR).
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Languages : en
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The theoretical description of pion-nucleus interactions, specifically in the intermediate-energy region dominated .delta.-excitation, is discussed. Attention is focused on the interaction with and propagation through the nucleus of pions and .delta.'s. The approach followed basically consists of viewing the .delta.-nucleus system, formed by pion excitation of a nucleon, as a doorway for the pion-nucleus reaction. Analysis of the interacting .delta.-nucleus system then leads to new dynamical information summarized in a complex .delta.-nucleus interaction potential. The associated nuclear medium corrections to .delta. propagation, related in more conventional language to higher-order corrections in the pion optical potential, are so large as to demand consideration in quantitative studies of nuclear structure with pions. After a discussion of the basic scale parameters characterizing intermediate-energy pion-nucleus interactions, the author discusses the theoretical framework and the extraction of .delta. interaction parameters from inclusive pion-nucleus cross sections. More detailed tests of the picture, such as elastic scattering angular distributions, are then discussed. Finally, some implications for intermediate-energy photoreactions are outlined. 11 figures. (RWR).
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Languages : en
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The theoretical description of pion-nucleus interactions, specifically in the intermediate-energy region dominated?-excitation, is discussed. Attention is focused on the interaction with and propagation through the nucleus of pions and?'s. The approach followed basically consists of viewing the?-nucleus system, formed by pion excitation of a nucleon, as a doorway for the pion-nucleus reaction. Analysis of the interacting?-nucleus system then leads to new dynamical information summarized in a complex?-nucleus interaction potential. The associated nuclear medium corrections to? propagation, related in more conventional language to higher-order corrections in the pion optical potential, are so large as to demand consideration in quantitative studies of nuclear structure with pions. After a discussion of the basic scale parameters characterizing intermediate-energy pion-nucleus interactions, the author discusses the theoretical framework and the extraction of? interaction parameters from inclusive pion-nucleus cross sections. More detailed tests of the picture, such as elastic scattering angular distributions, are then discussed. Finally, some implications for intermediate-energy photoreactions are outlined. 11 figures. (RWR).
Author: Jouni A. Niskanen
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Languages : sv
Pages : 29
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Languages : en
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The .delta.33 resonance is strongly excited in pion-nucleon scattering, but there is clearly only a limited amount of information that can be learned in scattering the pion from an isolated nucleon. One learns that there is a resonance of mass 1232 MeV, width 115 MeV, and, if one is willing to introduce a dynamical model, something about the off-shell extension of the amplitude. One stands to learn much more from pion-nucleus scattering because in this case the .delta.33 resonance has an opportunity to scatter from nucleons, and how this occurs is not well understood. What do we know about the .delta.-N interaction for pion-nucleus scattering. The isobar-hole model was invented to deal directly with the .delta.33-nucleus dynamics, and a phenomenological determination of the isobar shell-model potential was attempted. The unknown dynamics deltaU/sub .delta./ is contained in a central isoscalar spreading potential of strength W0 and a spin orbit potential deltaU0 = W0rho + spin-orbit. The real part of W0rho is measured relative to the nucleon-nucleus potential. From a more theoretical point of view, one would like to be able to calculate deltaU/sub .delta./, including its isospin dependence, from an underlying dynamical model which is formulated in terms of the basic effective meson-baryon couplings. Some salient properties of these couplings can be determined from models of quark-bag structure, which raises the exciting possibility of learning about these fundamental issues from pion scattering. Attempts at Los Alamos to build a theoretical framework to deal with these and other issues are described. (WHK).
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Languages : en
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Languages : en
Pages : 10
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Languages : en
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The elastic and inelastic scattering of intermediate energy (less than or equal to 1 GeV) protons by nuclei is considered first. The discussion focuses on the determination of the proton-nucleus optical potential in terms of the elementary nucleon-nucleon scattering amplitudes and the properties of the target and residual nucleus. The result is a series of terms for the optical potential. Then the interaction of pions with nuclei for energies in the neighborhood of the .delta.-resonance is discussed. In this energy domain an incident pion will with high probability be absorbed by a nucleon to produce the .delta.-resonance and thus form a .delta.-particle hole state in the nucleus. Next, the subject of hypernuclei is taken up. The .lambda. hypernuclei and a recently observed .sigma. hypernuclei comprise situations in which the core nucleus can be probed by a baryon of roughly the same mass as a nucleon, with similar albeit not identical interactions with nucleons. But the .lambda. (or .sigma.) does not need to satisfy the Pauli exclusion principle with respect to the nucleons, and therefore can be in orbits forbidden to it if it were a nucleon. As the energy of the projectile increases, it becomes correspondingly more important to take relativistic effects into account. The importance of these effects is strikingly revealed by experiments involving the collision of ultrarelativistic hadrons, protons, pions, kaons (up to Fermilab energies) with nuclei. This phenomenon forms part of the final topic, which includes as well as the collision of relativistic heavy ion projectiles with nuclei. A nuclear Weiszaecker-Williams method developed for dealing with peripheral collisions is described. 32 figures, 10 tables. (RWR).
Author: R. J. Blin-Stoyle
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ISBN: 9780444104465
Category :
Languages : en
Pages : 345
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Author: Roger John Blin-Stoyle
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ISBN: 9780444104045
Category : Particules (Physique nucléaire)
Languages : en
Pages : 345
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Author: Jerry William Ehlers
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ISBN:
Category : Symmetry (Physics)
Languages : en
Pages : 158
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