Nucleon Correlations In Nuclei
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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.
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.
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.
Low Energy Pion Double Charge Exchange And Nucleon Nucleon Correlations In Nuclei
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Author :
language : en
Publisher:
Release Date : 1988
Low Energy Pion Double Charge Exchange And Nucleon Nucleon Correlations In Nuclei written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with categories.
Recent measurements of pion double-charge exchange (DCX) at energies 20 to 70 MeV are providing a new means for studying nucleon-nucleon correlations in nuclei. At these energies the nucleus is relatively transparent, allowing simpler theoretical models to be used in interpreting the data and leading to a clearer picture. Also the contribution to DCX of sequential charge-exchange scattering through the intermediate analog state is suppressed near 50 MeV and transitions through non-analog intermediate states become very important. Recent theoretical studies by several groups have shown that while transitions through the analog route involve relatively long nucleon-nucleon distances, those through non-analog intermediate states obtain nearly half their strength from nucleon pairs with less than 1 fermi separation. Thus DCX near 50 MeV is an excellent way to study short-range nucleon-nucleon correlations. Data has been obtained for double-isobaric analog state (DIAS) transitions on 14C, 18O, 26Mg, and a number of nuclei in the f-7/2 shell including /sup 42,44,48/Ca, primarily at 35 and 50 MeV. Additional data for non-analog (ground state) transitions has also been obtained for 12C. These data are consistent with the two-amplitude theoretical models where the two amplitudes represent scattering through analog and through non-analog intermediate states. Calculations based on shell-model correlations explain the general trends of the data. Preliminary new data on the forward-angle energy dependence of the DIAS and g.s. transitions for /sup 42,44,48/Ca from 25 to 70 MeV is presented here and the current theoretical picture based upon this data is reviewed. 26 refs., 31 figs., 4 tabs.
Scattering Of Very High Energy Particles From Nuclei And Nucleon Nucleon Correlations
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Author : Wiesław Czyż
language : en
Publisher:
Release Date : 1967
Scattering Of Very High Energy Particles From Nuclei And Nucleon Nucleon Correlations written by Wiesław Czyż and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with categories.
Elastic Electron Scattering From Nuclei And Nucleon Nucleon Correlations
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Author : Wiesław Czyż
language : en
Publisher:
Release Date : 1967
Elastic Electron Scattering From Nuclei And Nucleon Nucleon Correlations written by Wiesław Czyż and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with categories.
Nucleon Nucleon Correlations Detected Via Pion Double Charge Exchange Reactions
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Author :
language : en
Publisher:
Release Date : 1987
Nucleon Nucleon Correlations Detected Via Pion Double Charge Exchange Reactions written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with categories.
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.
Nucleon Momentum Distributions And Correlations In Nuclei
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Author : A. N. Antonov
language : en
Publisher:
Release Date : 1987
Nucleon Momentum Distributions And Correlations In Nuclei written by A. N. Antonov and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with categories.
Alpha Like Four Nucleon Correlations In The Superfluid Phase Of Atomic Nuclei
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Author : M. Apostol
language : en
Publisher:
Release Date : 1985
Alpha Like Four Nucleon Correlations In The Superfluid Phase Of Atomic Nuclei written by M. Apostol and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with categories.
Nucleon Momentum And Density Distributions In Nuclei
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Author : A. N. Antonov
language : en
Publisher:
Release Date : 1988
Nucleon Momentum And Density Distributions In Nuclei written by A. N. Antonov and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Science categories.
Because it determines many of the features of nuclear reactions, such as knockout, inelastic scattering, and transfer processes at high energies, the momentum distribution of the nucleons in atomic nuclei is crucial to our understanding of nuclear structure. The distribution can be calculated from several models and the correctness of the result assessed experimentally. Due to the effects of short-range correlations and the many-body nature of the problem, these calculations are often difficult, requiring a variety of mathematical techniques. This book discusses these techniques and shows how the results may be related to measurements in the lab. This is a complete sourcebook for theoretical and experimental nuclear physicists.