A Microscopic Treatment Of Correlated Nucleons
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A Microscopic Treatment Of Correlated Nucleons
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Author : Olivier Vasseur (auteur d'une thèse de doctorat en Physique).)
language : en
Publisher:
Release Date : 2019
A Microscopic Treatment Of Correlated Nucleons written by Olivier Vasseur (auteur d'une thèse de doctorat en Physique).) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
This Ph.D. work falls within the scope of theoretical techniques tailored to the solution of the nuclear many-body problem. It was motivated by the perspective of using beyond-mean-field methods to improve the description of excitation spectra of stable and exotic nuclei, especially the low-energy states and the giant resonances. The chosen path in this direction is the development of models based on the second random-phase approximation (SRPA) used with a subtraction procedure. These developments aim to extend the range of applicability of the initial model and to include correlations in the ground state.A first part consists in applying the SRPA used with a subtraction method to the study of the dipole and quadrupole response in medium to heavy-mass nuclei, including the electric dipole polarizability. We verify that the subtracted SRPA corrects the problems observed with the standard SRPA model and improves the description of excitation spectra compared to the random-phase approximation (RPA). We also study beyond-mean-field effects that arise in the subtracted SRPA by exploiting the relation between the axial breathing modes in nuclei and the effective mass in nuclear matter.A second part is dedicated to extensions.As a first step, we extend the initial numerical tools by employing the equal-filling approximation (EFA), to enable the applications to nuclei with partially-occupied orbitals. We next propose a method to estimate part of the pairing effects using correlated occupation numbers.A study of possible ways to renormalize the subtracted SRPA is carried out by employing a model which goes beyond the quasiboson approximation. This extension also relies on the use of occupation numbers as a means to include ground state correlations. We show that correlations obtained from the computation of occupation numbers in iterative RPA calculations are not sufficient to address the standard SRPA drawbacks.
Nucleon Correlations In Nuclei
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Author : Anton N. Antonov
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Nucleon Correlations In Nuclei written by Anton N. Antonov and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
In recent years there has been growing interest in the nucleon-nucleon correl ations inside nuclei. In many respects the motions of the nucleons can be very well described by an overall mean field, so that the motion of each nucleon is governed by the mean field due to all the other nucleons. This concept underlies the Fermi-gas, Hartree-Fock and shell models and has enabled a range of nuclear properties to be calculated, often to surprising accuracy. It gradually became clear, however, that these mean-field models are limited by the effects due to the very strong interactions between the nucleons that occur at short distances; these are the short-range correlations. They are responsible for instance for the high-momentum components in the nucleon momentum dis tribution, and prevent the simultaneous description of the nuclear density and momentum distributions by the same mean field. It thus becomes necessary to develop methods for including the effects of nucleon correlations in nuclei, and these are the main subject of this book. Some related problems of nuclear structure were discussed in an earlier book by the same authors: Nucleon Momentum and Density Distributions in Nuclei (Clarendon Press, Oxford, 1988). The main aim of that book was to study the effects of nucleon-nucleon correlations, both short-range and tensor, on the nucleon momentum distribution, which is particularly sensitive to these correl ations, and on the nucleon density distribution.
A Microscopic Treatment Of Nucleon Scattering From Complex Nuclei
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Author : Carlos I. Calle
language : en
Publisher:
Release Date : 1984
A Microscopic Treatment Of Nucleon Scattering From Complex Nuclei written by Carlos I. Calle and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Particles (Nuclear physics) categories.
Hard Probes Of Short Range Nucleon Nucleon Correlations
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Author :
language : en
Publisher:
Release Date : 2012
Hard Probes Of Short Range Nucleon Nucleon Correlations written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
The strong interaction of nucleons at short distances leads to a high-momentum component to the nuclear wave function, associated with short-range correlations between nucleons. These short-range, high-momentum structures in nuclei are one of the least well understood aspects of nuclear matter, relating to strength outside of the typical mean-field approaches to calculating the structure of nuclei. While it is difficult to study these short-range components, significant progress has been made over the last decade in determining how to cleanly isolate short-range correlations in nuclei. We have moved from asking if such structures exist, to mapping out their strength in nuclei and studying their microscopic structure. A combination of several different measurements, made possible by high-luminosity and high-energy accelerators, coupled with an improved understanding of the reaction mechanism issues involved in studying these structures, has led to significant progress, and provided significant new information on the nature of these small, highly-excited structures in nuclei. We review the general issues related to short-range correlations, survey recent experiments aimed at probing these short-range structures, and lay out future possibilities to further these studies.
Nucleon Correlations In Nuclei
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Author : Anton Antonov
language : en
Publisher: Springer
Release Date : 1993-06-25
Nucleon Correlations In Nuclei written by Anton Antonov and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993-06-25 with Science categories.
In recent years there has been growing interest in the nucleon-nucleon correl ations inside nuclei. In many respects the motions of the nucleons can be very well described by an overall mean field, so that the motion of each nucleon is governed by the mean field due to all the other nucleons. This concept underlies the Fermi-gas, Hartree-Fock and shell models and has enabled a range of nuclear properties to be calculated, often to surprising accuracy. It gradually became clear, however, that these mean-field models are limited by the effects due to the very strong interactions between the nucleons that occur at short distances; these are the short-range correlations. They are responsible for instance for the high-momentum components in the nucleon momentum dis tribution, and prevent the simultaneous description of the nuclear density and momentum distributions by the same mean field. It thus becomes necessary to develop methods for including the effects of nucleon correlations in nuclei, and these are the main subject of this book. Some related problems of nuclear structure were discussed in an earlier book by the same authors: Nucleon Momentum and Density Distributions in Nuclei (Clarendon Press, Oxford, 1988). The main aim of that book was to study the effects of nucleon-nucleon correlations, both short-range and tensor, on the nucleon momentum distribution, which is particularly sensitive to these correl ations, and on the nucleon density distribution.
The Nucleon Nucleon Interaction And The Nuclear Many Body Problem
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Author : Gerald E. Brown
language : en
Publisher: World Scientific
Release Date : 2010
The Nucleon Nucleon Interaction And The Nuclear Many Body Problem written by Gerald E. Brown and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Science categories.
This book provides a comprehensive overview of some key developments in the understanding of the nucleon-nucleon interaction and nuclear many-body theory. The main problems at the level of meson exchange physics have been solved, and we have an effective field theory using a phenomenological interaction pioneered by Achim Schwenk and Scott Bogner, which is nearly universally accepted as a unique low-momentum interaction that includes all experimental data to date.This understanding is based on a multi-step development in which different scientific insights and a wide range of physical and mathematical methodologies fed into each other. It is best appreciated by looking at the different 'steps along the way', starting with the pioneering work of Brueckner and his collaborators that was just as necessary and important as the insightful masterly improvements to Brueckner's theory by Hans Bethe and his students. Moving on from there, the off-shell effects that bedeviled Bethe's work — which had resulted in the 1963 Reference Spectrum Method — were treated relatively accurately by introducing an energy gap between initial bound states and an intermediate state. With their influential 1967 paper, Brown and Kuo prepared the effective field theory. Later, the introduction of 'Brown-Rho scaling' deepened understanding of saturation in the many-body system and fed directly into recent work on carbon-14 dating.
Nuclear Particle Correlations And Cluster Physics
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Author : Schroeder Wolf-udo
language : en
Publisher: World Scientific
Release Date : 2017-05-19
Nuclear Particle Correlations And Cluster Physics written by Schroeder Wolf-udo and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-05-19 with Science categories.
A timely presentation of new results, challenges, and opportunities in the quickly developing field of nuclear cluster physics, presented by an international group of eminent theoretical and experimental scientists active in the field. Their work reveals how correlations of nucleons can appear spontaneously, propagate, and survive in nuclear matter at both low and high densities. Characteristic nuclear substructures, beyond those predicted by mean-field or collective scenarios, appear on microscopic and cosmic length scales. They can influence the dynamics of fusion of light nuclei and the decay of heavy, fissioning nuclei or of systems produced transiently in heavy-ion reactions. A must-read for young scientists entering the field and a valuable resource for more seasoned nuclear researchers!
Nuclear Physics
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Author : National Research Council
language : en
Publisher: National Academies Press
Release Date : 1999-03-31
Nuclear Physics written by National Research Council and has been published by National Academies Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999-03-31 with Science categories.
Dramatic progress has been made in all branches of physics since the National Research Council's 1986 decadal survey of the field. The Physics in a New Era series explores these advances and looks ahead to future goals. The series includes assessments of the major subfields and reports on several smaller subfields, and preparation has begun on an overview volume on the unity of physics, its relationships to other fields, and its contributions to national needs. Nuclear Physics is the latest volume of the series. The book describes current activity in understanding nuclear structure and symmetries, the behavior of matter at extreme densities, the role of nuclear physics in astrophysics and cosmology, and the instrumentation and facilities used by the field. It makes recommendations on the resources needed for experimental and theoretical advances in the coming decade.
The Atomic Nucleus As A Relativistic System
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Author : Lev N. Savushkin
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-03-09
The Atomic Nucleus As A Relativistic System written by Lev N. Savushkin and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-03-09 with Science categories.
Relativity plays an important role in atomic nuclei, and, since the early 1970s, there has been increasing interest in, and literature on, the nucleus as a relativistic system. In fact, the relativistic treatment provides a powerful method to describe nuclear structure and reactions. It is thus an ideal time to collect and review the important landmarks in this book. Directed to advanced students and researchers, it explains both the underlying relativistic theory and compares predictions with actual experiments.
Nuclear Physics Proceedings Of The Xiv Symposium
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Author : M E Brandan
language : en
Publisher: World Scientific
Release Date : 1991-04-29
Nuclear Physics Proceedings Of The Xiv Symposium written by M E Brandan and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991-04-29 with categories.
This book is aimed at scientists, technologists, engineers, and undergraduate and graduate students involved in analytical and process biochemistry and biotechnology. It reviews the potentialities of light-emitting reaction associated with the sensor approach.The book introduces the concepts of sensors and biosensors and places bio- and chemi-luminescent sensors in the general context of biosensors. It then briefly describes luminescence phenomena and provides some basic knowledge necessary for understanding and exploiting light-emitting reactions. These luminescence reactions, important from an analytical standpoint, are described. Also the applications of bio- and chemi-luminescence which make use of immobilized reagents are explained. Finally, there is discussion of bio- and chemi-luminescent sensors, most of them including fiber optics.