Two Topics in Pion Physics. I. Photoproduction of Neutral Pions from Complex Nuclei and the Pair-Correlation Function. II. the Relative Rate of Absorption of Negative Pions in Hydrogen and Deuterium (thesis).
Two Topics in Pion Physics. I. Photoproduction of Neutral Pions from Complex Nuclei and the Pair-Correlation Function. II. the Relative Rate of Absorption of Negative Pions in Hydrogen and Deuterium (thesis).

Author:

Publisher:

Published: 1962

Total Pages:

ISBN-13:

DOWNLOAD EBOOK

A simple theory of the photoproduction of pi /sup 0/ mesons from complex nuclei based on the impulse and closure approximation is studied. The theory is compared with an experiment of Goodwin, Anderson, and Kenney that shows the dependence of the number of decay gammas from pi /sup 0/ mesons photo- produced from various nuclei as a function of the atomic number at 45, 90, and 135 degrees for incident photon energies from threshold to 350 Mev. The dependence measured near threshold and at 45 degrees does not agree with the simple theory nor is it consistent with partial elastic production. By a method of Placzek and Wick the corrections to the simple theory are estimated, and found to be large near threshold. These corrections may explain the discrepancy between the theory and the experimental results. No information about the nuclear-pair correlation function is obtained. The impulse approximation is used to calculate the relative ratio of the radiative absorption rate of pi /sup -/ mesons absorbed in hydrogen and deuterium from an atomic s state. The calculated value of the ratio T = R(pi /sup -/ + d yields 2n + gamma)/R(pi /sup -/ + p yields n + gamma) is 0.83 plus or minus 0.08. The experimental value is 0.41 plus or minus 0.06. The closure approximation is used to evaluate T. By a method due to Placzek the error due to the closure approximation is shown to be small. (auth).

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

DOWNLOAD EBOOK

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.

Topics in Strangeness Nuclear Physics
Topics in Strangeness Nuclear Physics

Author: Petr Bydzovsky

Publisher: Springer

Published: 2007-07-18

Total Pages: 200

ISBN-13: 3540720391

DOWNLOAD EBOOK

Strangeness nuclear physics bears a broad impact on contemporary physics. This set of extensive lectures presents a balanced theoretical and experimental introduction to, and survey of, the field. It addresses topics such as the production and spectroscopy of strange nuclear systems, modern approaches to the hyperon-nucleon interaction, and weak decays of hypernuclei. This burgeoning research field is well served by this tutorial primer.

Theoretical Methods in Medium-Energy and Heavy-Ion Physics
Theoretical Methods in Medium-Energy and Heavy-Ion Physics

Author: K. W. McVoy

Publisher: Springer Science & Business Media

Published: 2013-11-11

Total Pages: 756

ISBN-13: 1461328772

DOWNLOAD EBOOK

A NATO Advanced Studies Institute was held June 12-23, 1978, at the University of Wisconsin in Madison, Wisconsin. It was a topical Institute in theoretical nuclear physics and had the some what novel feature of focussing not on a single topic but on two closely allied ones: pion-nucleus and heavy-ion physics. These two fields. both dedicated to the investigation of short-wave length properties of nuclei, have many techniques and concepts in cornmon, and essentially become one in the topic of relativistic heavy-ion physics. The purpose of including both in a single Institute was to encourage the practitioners in each of these fields to learn from those in the other; to judge from the liveli ness of the questioning which ensued, the purpose was well-served indeed. Because the Institute was viewed as one which served both educational and research ends, the lecturers took particular pains to develop their subjects in a careful, coherent sequence. The result is a compendium of advanced techniques and current results in these two rapidly-expanding fields of nuclear theory which should serve interested physicists as an ideal introduction to the fields. In addition to the support provided by the Scientific Affairs Division of NATO, substantial financial assistance was provided by the U. S. National Science Foundation and the Graduate School of the University of Wisconsin.