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 Recent Crystal Ball results on resonance formation in reactions gamma gamma reactions written by Johann K. Bienlein and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
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.
Download or read book Recent Crystal Ball Results on Resonance Formation in gamma Gamma reactions written by J. K. Bienlein and published by . This book was released on 1990 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the Decay of the gamma 1S and gamma 2S Resonances to Muon Pairs and Determination of the Strong Coupling Constant Using the Crystal Ball Detector written by Michael Kobel and published by . This book was released on 1991 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gamma Decay of Giant Resonances Excited by 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: Experiments on 2°8Pb bombarded by 17O at 22 MeV/nucleon (ORNL) and 84 MeV nucleon (GANIL) are reviewed. Inelastically scattered projectiles were detected at forward angles in coincidence with gamma rays seen in NaI (ORNL) or in BaF2 (GANIL). The 17O were identified by 6 Si telescopes covering THETA = 11. 5/degree/--14.5/degree/ (ORNL) or by the focal-plane detector system of the energy-loss spectrometer SPEG, set to accept THETA = 1. 5/degree/--5.0/degree/ (GANIL). The .gamma.-ray data provide information on the multipole character of various parts of the giant resonance region, matrix elements between the GR region and low-lying states in 2°8Pb, and the relative contribution of direct and compound process to .gamma.0 decay. At the higher energy the 9--15 MeV GR region is excited very strongly. The isovector giant dipole is dominant over most of the angles studied. Significant contributions from the isoscalar giant quadrupole and monopole resonances are also present. Decomposition of the GR into L = 1, 2, and 0 components was based on coincidences with the overwhelmingly dipole .gamma.0 transitions. The magnitude (1.7 +- 0.2%) and energy distribution of the .gamma.0 branch can be reproduced well by a parameter-free calculation. The .gamma.0 decay of the isoscalar giant quadrupole resonance is more easily observed at the lower energy. The .gamma.0 angular correlations confirm the presence of E2 radiation from states in the 9--11 MeV region. The B(E2) implies that the ratio of neutron to proton matrix elements is consistent with the expected value of N/Z. This conclusion is confirmed by evidence form Coulomb-nuclear interference in the singles data at 84 MeV/nucleon. Photon decays to excited states indicate that 4 and/or 6/sup +/ strength is present around 9--10 MeV, and are consistent with a monopole contribution from 12.5--15.5 MeV. 20 refs., 14 figs.
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.
Download or read book Excitation and Decay of Giant Resonances written by Ricardo A. Broglia and published by . This book was released on 19?? with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Statistical Method for the Study of Beta decay Giant Resonances written by Kamales Kar and published by . This book was released on 1980 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Double gamma Decay of the Electromagnetically Excited Double Giant Dipole Resonance in 208Pb written by James Lambrecht Ritman and published by . This book was released on 1993 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Double gamma decay of the electromagnetically excited double giant dipole resonance in 208 Pb written by James L. Ritman and published by . This book was released on 1993 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gamma Decay of Isovector Giant Resonances Built on Highly Excited States in A1 A1 A1Sn written by J. J. (Niels Bohr Institutet) Gaardhøje and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the Decay of the gamma 1S and gamma 2S Resonances to Muon Pairs and Determination of the Strong Coupling Constant Using the Crystal Ball Detector written by Michael Kobel and published by . This book was released on 1991 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A New Measurement of the Rare Decay Eta Pi0 Gamma Gamma with the Crystal Ball TAPS Detectors at the Mainz Microtron written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A new measurement of the rare, doubly radiative decay eta->pi0̂ gamma gamma was conducted with the Crystal Ball and TAPS multiphoton spectrometers together with the photon tagging facility at the Mainz Microtron MAMI. New data on the dependence of the partial decay width, Gamma(eta->pi0̂ gamma gamma), on the two-photon invariant mass squared, m2̂(gamma gamma), as well as a new, more precise value for the decay width, Gamma(eta->pi0̂ gamma gamma) = (0.33+/-0.03_tot) eV, are based on analysis of 1.2 x 103̂ eta->pi0̂ gamma gamma decays from a total of 6 x 107̂ eta mesons produced in the gamma p -> eta p reaction. The present results for dGamma(eta->pi0̂ gamma gamma)/dm2̂(gamma gamma) are in good agreement with previous measurements and recent theoretical calculations for this dependence.
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.
Download or read book Direct Capture Studies in the 4 S Giant Resonance Region written by and published by . This book was released on 1974 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
