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Pion Double Charge Exchange And Nuclear Structure
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Book Synopsis Pion-nucleus Double Charge Exchange - 2nd Lampf Workshop by : William R Gibbs
Download or read book Pion-nucleus Double Charge Exchange - 2nd Lampf Workshop written by William R Gibbs and published by World Scientific. This book was released on 1990-09-24 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Book Synopsis Pion Double Charge Exchange and Nuclear Structure by :
Download or read book Pion Double Charge Exchange and Nuclear Structure written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Pion double charge exchange to both the double-analog state and the ground state is studied for medium weight nuclei. The relative cross section of these two transitions and the importance of nuclear structure as a function of pion kinetic energy is examined. 16 figs., 5 tabs.
Book Synopsis Second LAMPF International Workshop on Pion-Nucleus Double Charge Exchange by : William R. Gibbs
Download or read book Second LAMPF International Workshop on Pion-Nucleus Double Charge Exchange written by William R. Gibbs and published by . This book was released on 1990 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theory of Pion Single and Double Charge Exchange by :
Download or read book Theory of Pion Single and Double Charge Exchange written by and published by . This book was released on 1994 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pion single and double charge exchange are being understood as an interplay between nuclear structure, hadron dynamics, and multiple scattering. Examples are given from work carried out in the last few years, and prospects for future development is given.
Book Synopsis Contributions of Pair Correlations to Pion-nucleus Double Charge Exchange by :
Download or read book Contributions of Pair Correlations to Pion-nucleus Double Charge Exchange written by and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recognizing the importance of both the reaction mechanism and nuclear structure aspects of the DCX, a new reaction theory was proposed in 1981 which offers a consistent treatment of these two equally important components of pion DCX. In this theory, the density square-dependent interaction is derived from the dynamical consideration of true pion absorption on a nucleon pair inside the nucleus. The strength of this new pion-nucleus interaction can then be calculated from the knowledge of the second-order pion-nucleus optical potential. With no free parameters for the pion-nucleus interaction and with the use of the coexistence nuclear model, the theory gives satisfactory descriptions of the magnitude and the shape of 5° excitation functions as well as of the differential cross sections for the DCX reactions 18O(.pi., .pi.−) 18Ne(DIAS) and 42Ca(.pi., .pi.−) 42Ti(DIAS) between 120 and 290 MeV. Our basic conclusions are: (1) the TSSCX mechanism alone cannot describe pion DCX; (2) the position of the first minimum in the differential cross section is very sensitive to the inclusion of density square-dependent interaction; and (3) on the other hand, the magnitude of the cross section is very sensitive to the inclusion of pair correlations (core excitation in the case with 18O and 42Ca).
Book Synopsis The Pion as a Probe of Nuclear Structure by :
Download or read book The Pion as a Probe of Nuclear Structure written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Some experiments are reviewed that have used the pion as a probe of nuclear structure. The examples chosen use the qualitative features of the pion-nucleon interaction to study selectively certain aspects of nuclear structure. The talk is divided into five parts: (1) properties of the pion and the pion-nucleon interaction, (2) studies of the isospin mixing and neutron-to-proton matrix element ratios in inelastic scattering, (3) studies of isovector giant resonances in pion single-charge-exchange reactions, (4) the search for six-quark structures in the nucleus using pion double-charge-exchange reactions, and (5) concluding remarks. 20 refs., 12 figs.
Book Synopsis Double Charge Exchange Scattering of Low Energy Pions by Nuclei by : Daniel S. Koltun
Download or read book Double Charge Exchange Scattering of Low Energy Pions by Nuclei written by Daniel S. Koltun and published by . This book was released on 1965 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pion-Nucleus Double Charge Exchange by : William R. Gibbs
Download or read book Pion-Nucleus Double Charge Exchange written by William R. Gibbs and published by . This book was released on 1990 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spine title: Pion-nucleus double charge exchange.
Book Synopsis Pion Charge Exchange and Nuclear Structure by :
Download or read book Pion Charge Exchange and Nuclear Structure written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Positive-pion Double-charge-exchange Reaction by :
Download or read book Positive-pion Double-charge-exchange Reaction written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The (.pi., .pi.−) double-charge-exchange (DCX) reaction has been performed on targets of T = 0,1 isospin (and isotopic) pairs 16 18O and 24 26Mg. Energy excitation functions of d sigma/d .cap omega., across the (3,3) .pi.-N resonance, are presented for transitions to double-isobaric analog state (DIAS) and non-DIAS ground-state residual nuclei. Angular distributions in the region of 5° to 33° are presented for the DIAS from the T = 1 nuclei. The similarities and differences of DIAS and non-DIAS distributions are discussed in relation to reaction-mechanism and nuclear-structure effects. Also, a simple, two-amplitude model for the 18O excitation function, consistent with the data, is presented. The utility of DCX in nuclear mass measurements is discussed, with some examples.
Book Synopsis Nuclear Structure in Pion Scattering and Charge Exchange by :
Download or read book Nuclear Structure in Pion Scattering and Charge Exchange written by and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Data from pion inelastic scattering and charge-exchange experiments are discussed within the framework of a DWIA analysis. The properties of the pion-nucleon interaction transformed to the pion-nuclear system are used to infer new nuclear-structure information for both discrete states and giant resonances.
Book Synopsis Pion Double Charge Exchange in P-shell Nuclei by : Wilson Fong
Download or read book Pion Double Charge Exchange in P-shell Nuclei written by Wilson Fong and published by . This book was released on 1995 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Probing Two-nucleon Correlations with Pion Double-charge Exchange by :
Download or read book Probing Two-nucleon Correlations with Pion Double-charge Exchange written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A review is given of pion double-charge exchange reactions at incident energies of 25 to 65 MeV and leading to nuclear isobaric- analog states and to ground states. The large effects on the cross-section magnitudes and angular distribution shapes produced by spatial correlations in nuclear wave functions are demonstrated. The data on 1f7/2 nuclei at 35 MeV obtained in the last few years are used to establish the general validity of the two-amplitude shell model description for these transitions. Recent measurements on the energy dependence between 20 and 65 MeV of forward-angle cross sections are presented and discussed. 19 refs., 15 figs., 2 tabs.
Book Synopsis Single- and Double-charge Exchange at Low Pion Energies by :
Download or read book Single- and Double-charge Exchange at Low Pion Energies written by and published by . This book was released on 1991 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: A review is given of pion single- and double-charge exchange reactions at incident energies of 25 to 65 MeV leading to isobaric analog states, and in the case of double-charge exchange leading to the ground state of the residual nucleus. The crucial role of the higher nuclear transparency at low pion energies for the analysis of the data in terms of single and double scattering is demonstrated. The large effects on double-charge exchange produced by the spatial correlations in nuclear wave functions are evident. The data on 1f--2 nuclei at 35 MeV are used to establish the general validity of a shell-model-based two-amplitude model for these transitions. Recent measurements of the energy dependence between 25 and 65 MeV of double-charge exchange cross sections at forward angles are presented and discussed. 33 refs., 19 figs.
Book Synopsis New Vistas In Physics With High-energy Pion Beams - Preconference Workshop, Dnp Fall Meeting 1992 by : John B Mcclelland
Download or read book New Vistas In Physics With High-energy Pion Beams - Preconference Workshop, Dnp Fall Meeting 1992 written by John B Mcclelland and published by World Scientific. This book was released on 1993-04-27 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: This workshop gives an overview of the physics opportunities that would be created by high-quality, intense pion beams with energies up to about 1 GeV. Topics explored include hypernuclear structure studies using the (π,K) reaction, hyperon-nucleon scattering including polarization, high-energy pion-nucleus reactions such as absorption and double charge exchange, baryon-resonance investigations, and decays of the π and h mesons. The present status of high-energy pion beamlines and instrumentation as well as new directions in the field were also discussed.
Book Synopsis Nuclear-structure Studies with Pions and Heavy Ions. Progress Report, June 1, 1980-May 31, 1981 by :
Download or read book Nuclear-structure Studies with Pions and Heavy Ions. Progress Report, June 1, 1980-May 31, 1981 written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments performed at the Los Alamos Meson Physics Facility yielded very striking results. In inelastic pion scattering from 14C near the (3,3) resonance cross sections ratios R = sigma(.pi.)/sigma(.pi.−) and R−1 = sigma(.pi.−)/sigma(.pi.+) were observed that are significantly larger than the free pion-nucleon values. These results were interpreted as due to strong cancellations of the neutron and proton components in the transition amplitude. Measurements of 13C(.pi., .pi.') excitation functions between 100 and 300 MeV at two momentum transfers showed dramatically different energy dependencies for .delta.S =0 and .delta.S = 1 transitions. They were used to derive nuclear structure information on several highly excited states. Pion data for other nuclei (12C, 16O, 4°Ca, etc.) were analyzed and information on isospin mixing, the double-charge-exchange reaction mechanism, and the excitation of collective states was extracted. Further data were taken with a 547 MeV proton beam on 13C. The data taking for the (t, t') and (3He, 3He') reactions at the Los Alamos Van de Graaff has been completed. The continuing studies of the heavy-ion nucleus optical potential yielded information on very systematic dependencies of the potential depths on the incident energy.
Book Synopsis Pion Double Charge Exchange on Medium-mass Nuclei by : Patrick Pakhim Hui
Download or read book Pion Double Charge Exchange on Medium-mass Nuclei written by Patrick Pakhim Hui and published by . This book was released on 1996 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
