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Investigation Of Giant Resonances Via Photon Decay
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Book Synopsis Investigation of Giant Resonances Via Photon Decay by :
Download or read book Investigation of Giant Resonances Via Photon Decay written by and published by . This book was released on 1993 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Photon Decay of Giant Multipole Resonances by :
Download or read book Photon Decay of Giant Multipole Resonances written by and published by . This book was released on 1990 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: A brief review of the excitation of giant multipole resonances via Coulomb excitation is given which emphasizes the very large cross sections that can be realized through this reaction for both isoscalar and isovector resonances. Discussion and results where available, are provided for the measurement of the photon decay of one and two phonon giant resonances. 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 shingles spectra. 26 refs., 16 figs., 1 tab.
Download or read book Giant Resonance Decay written by and published by . This book was released on 1990 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Excitation and Photon Decay of Giant Multipole Resonances by :
Download or read book Excitation and Photon Decay of Giant Multipole Resonances written by and published by . This book was released on 1990 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: A brief review of the excitation of giant multipole resonances via Coulomb excitation is given which emphasizes the very large cross sections that can be realized through this reaction for both isoscalar and isovector resonances. Discussion and results where available, are provide for the measurement of the photon decay of one and two phonon giant resonances. 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. 14 refs., 12 figs., 1 tab.
Book Synopsis Excitation and Photon Decay of Giant Multipole Resonances - the Role and Future of Medium-energy Heavy Ions by :
Download or read book Excitation and Photon Decay of Giant Multipole Resonances - the Role and Future of Medium-energy Heavy Ions written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 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.
Book Synopsis Gamma Ray And Particle Production In Heavy Ion Reactions - Proceedings Of Ii Taps Workshop by : Jose Diaz
Download or read book Gamma Ray And Particle Production In Heavy Ion Reactions - Proceedings Of Ii Taps Workshop written by Jose Diaz and published by World Scientific. This book was released on 1994-10-25 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings treat the production of high energy gamma rays and particles (mesons and dileptons) in heavy ion reactions from energies of about 30 MeV·A to a few GeV·A, and its application to the study of the Nuclear Equation of State from both the experimental and theoretical points of view. Giant resonances, intensity interferometry, meson fotoproduction and applications of intermediate energy heavy ion beams are also discussed.
Book Synopsis Excitation and Photon Decay of Giant Resonances Excited by Intermediate Energy Heavy Ions by :
Download or read book Excitation and Photon Decay of Giant Resonances Excited by Intermediate Energy Heavy Ions written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Giant Resonances written by P.F. Bortigan and published by Taylor & Francis. This book was released on 2023-05-31 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Photon Decay of Giant Resonances by :
Download or read book Photon Decay of Giant Resonances written by and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements have been made of the photon decay of the giant multipole resonances in 2°8Pb. The giant resonances were excited by inelastic scattering of 380 MeV 17O projectile and the photons were detected in the ORNL Spin Spectrometer. The results show a quadrupole resonance ground state gamma branch of 20% while only less than or equal to 2% of the GQR decay proceeds through the 2.6 MeV, 3− state. Nearly one half of the GQR decay through a 3− state at 4.974 MeV. Photon decay from the dipole and monopole resonances and high spin resonances (4+,6+) are also observed.
Book Synopsis Electromagnetic Decay of Giant Resonances by :
Download or read book Electromagnetic Decay of Giant Resonances written by and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Download or read book Giant Resonances written by and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A review of some recent developments in the field of giant multipole resonances is presented. Particular emphasis is placed on directions that the authors feel will be followed in this field during the next several years. In particular, the use of high-energy heavy ions to excite the giant resonances is shown to provide exciting new capabilities for giant resonance studies. Among subjects covered are: Coulomb excitation of giant resonances, photon decay of giant resonances, the recent controversy over the identity of the giant monopole resonance, the most recent value for incompressibility of nuclear matter from analysis of giant monopole data, the isospin character of the 63 A/sup /minus/1/3/ GQR, agreement between (e, e/prime/) and (hadron, hadron/prime/) excitation of the giant quadrupole resonance, prospects for multiphonon giant resonance observation, and isolation of the isovector giant quadrupole resonance. 55 refs., 23 figs., 4 tabs.
Book Synopsis Heavy Ion Excitation and Photon Decay of Giant Resonances by :
Download or read book Heavy Ion Excitation and Photon Decay of Giant Resonances written by and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Results are presented for excitation of giant multipole resonances by inelastic scattering of 350 and 500 MeV 16O projectiles from 9°Zr and 2°8Pb. The giant quadrupole resonance is excited with large cross sections and a very large resonance peak to continuum ratio is obtained. Extracted cross sections agree with DWBA calculations which use standard collective model form factors. Using 380 MeV 170 to excite the giant resonances, the .gamma.-ray decay has been measured for the giant quadrupole resonance region of 2°8Pb. 10 references.
Book Synopsis Crystal Ball Studies of Giant Resonance Gamma Decay by :
Download or read book Crystal Ball Studies of Giant Resonance Gamma Decay written by and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We have carried out coincidence experiments to investigate the photon and neutron emission from the giant resonance region in 2°8Pb and 9°Zr using the ORNL Spin Spectrometer, a 72-segment NaI detector system. States in 2°8Pb and 9°Zr were excited by inelastic scattering of 380-MeV 17O. 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. Especially interesting observations include the absence of a significant branch from the giant quadrupole resonance to the 3− state at 2.6 MeV, a strong branch from this resonance to a 3− state at 4.9 MeV, and the dominance of decays to various 1− states at 5 to 7 MeV from the region around 14 MeV of excitation (EO resonance). Comparable but less complete data were also obtained on 9°Zr. 14 references.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994-03 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Giant Resonances and Intermediate Energy Heavy Ions by :
Download or read book Giant Resonances and Intermediate Energy Heavy Ions written by and published by . This book was released on 1991 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis The Two-Photon Decay of the 11-/2 Isomer of 137Ba and Mixed-Symmetry States of 92,94Zr and 94Mo by : Christopher Walz
Download or read book The Two-Photon Decay of the 11-/2 Isomer of 137Ba and Mixed-Symmetry States of 92,94Zr and 94Mo written by Christopher Walz and published by Springer. This book was released on 2015-12-24 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work focuses on new electromagnetic decay mode in nuclear physics. The first part of the thesis presents the observation of the two-photon decay for a transition where the one-photon decay is allowed. In the second part, so called quadrupole mixed-symmetry is investigated in inelastic proton scattering experiments. In 1930 Nobel-prize winner M. Goeppert-Mayer was the first to discuss the two-photon decay of an exited state in her doctoral thesis. This process has been observed many times in atomic physics. However in nuclear physics data is sparse. Here this decay mode has only been observed for the special case of a transition between nuclear states with spin and parity quantum number 0+. For such a transition, the one-photon decay – the main experimental obstacle to observe the two-photon decay – is forbidden. Furthermore, the energy sharing and angular distributions were measured, allowing conclusions to be drawn about the multipoles contributing to the two-photon transition. Quadrupole mixed-symmetry states are an excitation mode in spherical nuclei which are sensitive to the strength of the quadrupole residual interaction. A new signature for these interesting states is presented which allows identification of mixed-symmetry states independently of electromagnetic transition strengths. Furthermore this signature represents a valuable additional observable to test model predictions for mixed-symmetry states.
Book Synopsis Gamma Ray and Particle Production in Heavy Ion Reactions by : José Díaz
Download or read book Gamma Ray and Particle Production in Heavy Ion Reactions written by José Díaz and published by . This book was released on 1994 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt:
