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Languages : en
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Coincidence experiments were done to investigate the photon and neutron emission from the giant resonance regions of 2°8Pb and 9°Zr using the ORNL Spin Spectrometer, a 72-segment NaI detector system. We have determined the total gamma-decay probability, the ground-state gamma branching ratio, and the branching ratios to a number of low-lying states as a function of excitation energy in 2°8Pb to approx. 15 MeV. Similar data were also obtained on 9°Zr. The total yield of ground-state E2 gamma radiation in 2°8Pb and the comparative absence of such radiation in 9°Zr can only be understood if decay of compound (damped) states is considered. Other observations in 2°8Pb include the absence of a significant branch from the giant quadrupole resonance (GQR) to the 3− state at 2.6 MeV, a strong branch to a 3− state at 4.97 MeV from the same region, and transitions to various 1− states between 5 to 7 MeV from the E* approx. 14 MeV region (EO resonance).
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Languages : en
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Book Description
Coincidence experiments were done to investigate the photon and neutron emission from the giant resonance regions of 2°8Pb and 9°Zr using the ORNL Spin Spectrometer, a 72-segment NaI detector system. We have determined the total gamma-decay probability, the ground-state gamma branching ratio, and the branching ratios to a number of low-lying states as a function of excitation energy in 2°8Pb to approx. 15 MeV. Similar data were also obtained on 9°Zr. The total yield of ground-state E2 gamma radiation in 2°8Pb and the comparative absence of such radiation in 9°Zr can only be understood if decay of compound (damped) states is considered. Other observations in 2°8Pb include the absence of a significant branch from the giant quadrupole resonance (GQR) to the 3− state at 2.6 MeV, a strong branch to a 3− state at 4.97 MeV from the same region, and transitions to various 1− states between 5 to 7 MeV from the E* approx. 14 MeV region (EO resonance).
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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: P.F. Bortigan
Publisher: Taylor & Francis
ISBN: 1000940667
Category : Science
Languages : en
Pages : 290
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Book Description
The series of volumes, Contemporary Concepts in Physics, is addressed to the professional physicist and to the serious graduate student of physics. The subject of many-body systems constitutes a central chapter in the study of quantum mechanics, with applications ranging from elementary particle and condensed matter physics to the behaviour of compact stellar objects. Quantal size effects is one of the most fascinating facets of many-body physics; this is testified to by the developments taking place in the study of metallic clusters, fullerenes, nanophase materials, and atomic nuclei. This book is divided into two main parts: the study of giant resonances based on the atomic nucleus ground state (zero temperature), and the study of the y-decay of giant resonances from compound (finite temperature) nuclei.
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Languages : en
Pages : 17
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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.
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Languages : en
Pages : 19
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Book Description
We describe some investigations into properties of giant resonances using elastic scattering of fast heavy-ion beams and the coincident detection of the gamma decay of the excited nucleus, using the TAPS array at GANIL. The particular experiments described are the identification of multiphoton giant resonance states and the measurement of projectile excitation, using the KVI forward wall detector.
Author: Ricardo A. Broglia
Publisher:
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Languages : en
Pages :
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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.
Author: F. Cannata
Publisher: Springer
ISBN: 3540382577
Category : Science
Languages : en
Pages : 123
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Book Description
Author: R.A. Broglia
Publisher: Elsevier
ISBN: 0444598405
Category : Science
Languages : en
Pages : 633
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Book Description
Nuclear Structure 1985
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Languages : en
Pages :
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Book Description
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.
