Pions and Nuclei
Pions and Nuclei

Author: Torleif Erik Oskar Ericson

Publisher: Oxford University Press, USA

Published: 1988

Total Pages: 506

ISBN-13:

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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.

Pion-nucleus Double Charge Exchange - 2nd Lampf Workshop
Pion-nucleus Double Charge Exchange - 2nd Lampf Workshop

Author: William R Gibbs

Publisher: World Scientific

Published: 1990-09-24

Total Pages: 622

ISBN-13: 9814611875

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What do you associate with chemistry? Explosions, innovative materials, plastics, pollution? The public's confused and contradictory conception of chemistry as basic science, industrial producer and polluter contributes to what we present in this book as chemistry's image as an impure science. Historically, chemistry has always been viewed as impure both in terms of its academic status and its role in transforming modern society. While exploring the history of this science we argue for a characteristic philosophical approach that distinguishes chemistry from physics. This reflection leads us to a philosophical stance that we characterise as operational realism. In this new expanded edition we delve deeper into the questions of properties and potentials that are so important for this philosophy that is based on the manipulation of matter rather than the construction of theories./a

Pion Charge Exchange and Nuclear Structure
Pion Charge Exchange and Nuclear Structure

Author:

Publisher:

Published: 1987

Total Pages:

ISBN-13:

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Whereas the nuclear charge distribution, essentially determined by the protons, has been studied for decades in elastic electron scattering, a study of the neutron distribution in nuclei has only recently become possible through pion charge-exchange experiments. The excitation of the isobaric analog state (IAS) in pion single-charge-exchange reactions is one of the most prominent candidates for such an investigation which will be especially interesting for strongly deformed nuclei which can be aligned in magnetic fields. This contribution concentrates on calculations related to such a reaction for the rare-earth nucleus Ho-165. 8 refs., 3 figs.

Pions In Nuclei - Proceedings Of The International Workshop
Pions In Nuclei - Proceedings Of The International Workshop

Author: M J Vicente-vacas

Publisher: World Scientific

Published: 1992-03-27

Total Pages: 730

ISBN-13: 9814555916

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The proceedings reflect the recent experimental and theoretical progress in pion nuclear physics in topics like pionic atoms, pion absorption, charge exchange, (π, 2π), and others involving pions in nuclei using different probes, as electron photons or heavy ions. Related topics on chiral symmetry, low energy πN and (γ, π⁰) and quark degrees of freedom are also addressed.

Pion Nucleus Single Charge Exchange Reactions Above The. Delta. (1232) Resonance
Pion Nucleus Single Charge Exchange Reactions Above The. Delta. (1232) Resonance

Author:

Publisher:

Published: 1987

Total Pages:

ISBN-13:

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Forward-angle differential cross sections for the (.pi., .pi.°) reaction leading to the Isobaric Analog State in the residual nuclei at 300, 425, 500 and 550 MeV have been measured. Targets ranged in mass from 7Li to 2°8Pb. A description of the experimental setup and the analysis is presented. The 0° cross sections are found to rise markedly between 300 and 425 MeV, contrary to the extrapolation from the lower energy data and to the behavior of the free pion-nucleon single charge exchange process. The angular distributions are sharply forward peaked. Systematics of the data indicate increased volume penetration with increasing pion beam energy. The cross sections are compared with the results of Glauber model calculations indicating the significance of higher order processes even at these energies. 67 refs., 40 figs., 22 tabs.

Nucleon-nucleon Correlations Detected Via Pion Double-charge-exchange Reactions
Nucleon-nucleon Correlations Detected Via Pion Double-charge-exchange Reactions

Author:

Publisher:

Published: 1987

Total Pages:

ISBN-13:

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Double-charge-exchange reactions induced by pions are shown to furnish a direct means of detecting nucleon-nucleon correlations in nuclei. For the particular case of double isobaric analog transitions the effect of correlations is easily isolated and quite strong. Examination of the properties of the position correlations implicit in the nuclear shell model provides an explanation of several experimentally observed features of double-charge-exchange reactions, including in particular, their dependence on the number of valence neutrons present. An explicit demonstration of the role played by nucleon-nucleon correlations is presented for the double-charge-exchange cross-sections of 42Ca, 44Ca and 48Ca, recently measured at LAMPF. Our analysis explains why the cross section for the double-charge-exchange reaction on 48Ca, in which 28 neutron pairs participate, is comparable and indeed smaller than the corresponding cross-section for 42Ca with its single valence neutron pair. It also predicts the variation of angular distributions over the family of isotopes. 13 refs., 3 figs.