Giant Resonances and Intermediate Energy Heavy Ions PDF Download
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Author:
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Languages : en
Pages : 11
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Book Description
We briefly explore how large cross sections for excitation of both isoscalar and isovector giant multipole resonances which can be obtained using intermediate energy heavy-ion reactions can be utilized in photon-decay coincidence experiments to provide new information on subjects ranging from basic nuclear structure properties to resonance damping and pre-compound decay. We also discuss experiments in which photon-decay techniques are used as a tag to isolate and identify very weakly excited modes, enabling us to explore such diverse subjects as hadronic excitation of the giant dipole resonance, the distribution of isovector quadrupole strength in 2°8Pb, and the excitation of two-phonon giant resonance strength. 25 refs., 12 figs.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 11
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Book Description
We briefly explore how large cross sections for excitation of both isoscalar and isovector giant multipole resonances which can be obtained using intermediate energy heavy-ion reactions can be utilized in photon-decay coincidence experiments to provide new information on subjects ranging from basic nuclear structure properties to resonance damping and pre-compound decay. We also discuss experiments in which photon-decay techniques are used as a tag to isolate and identify very weakly excited modes, enabling us to explore such diverse subjects as hadronic excitation of the giant dipole resonance, the distribution of isovector quadrupole strength in 2°8Pb, and the excitation of two-phonon giant resonance strength. 25 refs., 12 figs.
Author: Ricardo A. Broglia
Publisher:
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Category :
Languages : en
Pages :
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Author:
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Category :
Languages : en
Pages :
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Book Description
The role of intermediate energy heavy ions in the study of giant multipole resonances is explored, with emphasis on gamma decay coincidence experiments. Experiments on 2°8Pb bombarded by 84 MeV/nucleon 17O are discussed and compared with earlier work at 22 MeV/nucleon. The role of Coulomb excitation in the 84 MeV/nucleon data is emphasized and some consequences for study of isovector resonance strength are explored. A comparison of the excitation and decay of the isovector giant dipole resonance in 2°8Pb and 2°9Bi excited with 84 MeV/nucleon 17O scattering is presented. 35 refs., 16 figs., 1 tab.
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Category :
Languages : en
Pages :
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Inelastic scattering of medium energy heavy ions provides very large cross sections and peak-to-continuum ratios for excitation of giant resonances. For energies above about 50 MeV/nucleon, giant resonances are excited primarily through Coulomb excitation, which is indifferent to isospin, thus providing a good probe for the study of isovector giant resonances. The extremely large cross sections available from heavy ion excitation permit the study of rare decay modes of the giant resonances. In particular, recent measurements have been made of the photon decay of giant resonances following excitation by 22 and 84 MeV/nucleon 17O projectiles. The singles results at 84 MeV/nucleon yield peak cross sections for the isoscalar giant quadrupole resonance and the isovector giant dipole resonance of approximately 0.8 and 3 barns/sr, respectively. Data on the ground state decay of the isoscalar giant quadrupole and isovector giant dipole resonances are presented and compared with calculations. Decays to low-lying excited states are also discussed. Preliminary results from an experiment to isolate the 2°8Pb isovector quadrupole resonance using its gamma decay are presented. 22 refs., 19 figs., 1 tab.
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Category :
Languages : en
Pages :
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Book Description
The role of intermediate energy heavy ions in the study of giant multipole resonances is explored, with emphasis on gamma decay coincidence experiments. Experiments on 2°8Pb bombarded by 22 MeV/nucleon and 84 MeV/nucleon 17O are discussed and compared. The role of Coulomb excitation in the 84 MeV/nucleon data is emphasized and some consequences for study of isovector resonance strength are explored. A comparison of the excitation and decay of the isovector giant dipole resonance in 2°8Pb and 2°9Bi excited with 84 MeV/nucleon 17O scattering is presented. 19 refs., 15 figs., 1 tab.
![Investigations of the Isovector Giant Dipole Resonance in 208Pb and 40Ca by (p, P'[gamma]) at 200 MeV and of the GDR X GDR Excitation in 208Pb by Intermediate-energy Heavy Ions PDF](https://books.google.com/books/content/images/frontcover/wvAQtwAACAAJ?fife=w80-h100)
Author: Don H. Olive
Publisher:
ISBN:
Category : Calcium
Languages : en
Pages : 174
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Book Description
The goal of this dissertation in to provide a systematic study of the nuclear excitation of the giant dipole resonance (GDR) using medium-energy light ions and lower-energy heavy ions, where the Coulomb excitation of the resonances is small. Also, the Coulomb excitation of multiphonon giant resonances by intermediate-energy heavy ions will be examined.
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Category :
Languages : en
Pages :
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Book Description
The prospects for high energy heavy ion excitation of giant resonances are discussed. A brief review is provided of the results obtained to date using low/medium energy heavy ions and it is suggested that those results show no substantial advantage of heavy ions for giant resonance excitation. Calculations are presented that show that Coulomb excitation becomes the dominant excitation mechanism of the giant resonances for heavy ions above about 100 MeV/nucleon. The Coulomb excitation provides extremely large differential cross sections for excitation of both isovector and isoscalar resonances. Recent data are presented for inelastic scattering of 84 MeV/nucleon 17O ions on 2°8Pb that demonstrate the effectiveness of Coulomb excitation in providing extremely large cross sections and peak-to-continuum ratios for the isoscalar giant quadrupole resonance and the isovector giant dipole resonance. 19 refs., 17 figs.
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Category :
Languages : en
Pages : 12
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Book Description
The study of giant resonances using intermediate energy heavy-ion elastic scattering is discussed with emphasis on the potential of these probes for exploration of strengths above the giant dipole resonance (GDR) in singles and in decay experiments. Recent results on two phonon GDR strength are presented.
Author:
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ISBN:
Category :
Languages : en
Pages : 17
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Book Description
Decay studies of giant multipole resonances are discussed, emphasizing the role of Coulomb excitation with intermediate energy heavy ions, which can provide very large cross sections for both isoscalar and isovector resonances. We discuss measurement of the photon decay of one and two phonon giant resonances, reporting results where available. It is pointed out throughout the presentation that the use of E1 photons as a tag'' provides a means to observe weakly excited resonances that cannot be observed in the singles spectra. 30 refs., 16 figs., 1 tab.
Author: M. N. Harakeh
Publisher: Oxford Studies in Nuclear Phys
ISBN: 9780198517337
Category : Science
Languages : en
Pages : 658
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Book Description
Giant resonances are collective excitations of the atomic nucleus, a typical quantum many-body system. The study of these fundamental modes has in many respects contributed to our understanding of the bulk behavior of the nucleus and of the dynamics of non-equilibrium excitations. Although the phenomenon of giant resonances has been known for more than 50 years, a large amount of information has been obtained in the last 10 years. This book gives an up-to-date, comprehensive account of our present knowledge of giant resonances. It presents the experimental facts and the techniques used to obtain that information, describes how these facts fit into theoretical concepts and how this allows to determine various nuclear properties which are otherwise difficult to obtain. Included as an introduction is an overview of the main facts, a short history of how the field has developed in the course of time, and a discussion of future perspectives.
