Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
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).
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Several experiments have measured nominally-charge-symmetric scattering of pions from tritium ([sup 3]H) and [sup 3]He. These experiments have covered incident pion energies from 142 MeV to 295 MeV and scattering angles up to 110[degrees] in the laboratory. The results have been used to study charge-symmetry breaking and nuclear scattering systematics. In the work I have extended these measurements to angles near 180[degrees] for pion energies of 142 MeV, 180 MeV, 220 MeV, and 256 MeV, which bracket the [Delta][sub 33] pion-nucleon resonance. This is the most extensive set of [pi]T and [pi][sup 3]He data in this kinematical region. It will allow tests of scattering theory of pion-nucleus interactions and charge-symmetry breaking in back-angle scattering, and, within the limits of these two theories, it may help improve our understanding of the structure of these nuclei.
Author: Publisher: ISBN: Category : Languages : en Pages : 18
Book Description
It is argued that pion-nucleus scattering at high energy (above 300 MeV) is likely to be easier to interpret than it has been at lower energies where the [Delta][sub 33] resonance dominates. We establish this by examining the relative importance of various dynamic ingredients of scattering theory for high-energy pions and comparing different versions of the theory: a model-exact'' microscopic optical model and an eikonal approximation. For nuclei as heavy as Ca, the eikonal theory is an excellent approximation to the full theory for the angular distribution out to the position of the second minimum in the cross section. The prospects for using high-energy pions to examine modifications of nucleons and baryon resonances in nuclei, nuclear structure, exchange currents, short-range correlations, and to characterize pion propagation are discussed.
Author: Torleif Erik Oskar Ericson Publisher: Oxford University Press, USA ISBN: Category : Language Arts & Disciplines Languages : en Pages : 506
Book Description
The pion plays an outstanding role in nuclear physics as a generator of the nuclear force and as an important part of the nuclear many-body problem. At the same time, pion beams are used as probes to explore the nucleus and its interactions. As pion physics has matured over the years, a rich and diverse variety of phenomena has been uncovered. The aim of this book is to examine the underlying physical picture behind these phenomena in a systematic and coherent way. The authors emphasize the interplay between physical concepts and experimental facts more than the formal tools, which are presented in a series of appendices. The book is directed towards advanced students as well as research workers.
Author: Publisher: ISBN: Category : Languages : en Pages : 154
Book Description
Several experiments have measured nominally-charge-symmetric scattering of pions from tritium (3H) and 3He. These experiments have covered incident pion energies from 142 MeV to 295 MeV and scattering angles up to 110° in the laboratory. The results have been used to study charge-symmetry breaking and nuclear scattering systematics. In the work I have extended these measurements to angles near 180° for pion energies of 142 MeV, 180 MeV, 220 MeV, and 256 MeV, which bracket the [Delta]33 pion-nucleon resonance. This is the most extensive set of [pi]T and [pi]3He data in this kinematical region. It will allow tests of scattering theory of pion-nucleus interactions and charge-symmetry breaking in back-angle scattering, and, within the limits of these two theories, it may help improve our understanding of the structure of these nuclei.
Author: Robert J. Cence Publisher: Princeton University Press ISBN: 1400874882 Category : Science Languages : en Pages : 149
Book Description
One of the most fundamental problems in elementary particle physics is the study of the interaction of the pion meson with nucleons. It is believed that the pion meson plays a fundamental role in the description of nuclear forces and it is important, therefore, to understand the interaction of these particles. The primary method of gaining information on this interaction is through scattering experiments, and this book is concerned primarily with studies of pion-nucleon scattering at high energies. Originally published in 1969. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.
Author: 
Author: Md. A. Rahman
Author: Lowell Arthur Charlton
Author: Michael Larry Warneke
Author: ![Elastic Scattering of Pions from Tritium and [sup 3]He in the Backward Hemisphere in the Region of the [Delta][sub 33](1232) Resonance PDF](https://books.google.com/books/content/images/frontcover/6KfujwEACAAJ?fife=w80-h100)
Author: 
Author: 
Author: Torleif Erik Oskar Ericson![Elastic Scattering of Pions from Tritium and 3He in the Backward Hemisphere in the Region of the [Delta]33(1232) Resonance PDF](https://books.google.com/books/content/images/frontcover/12phswEACAAJ?fife=w80-h100)
Author: 
Author: Robert J. Cence