Extending the Kawai-Kerman-McVoy Statistical Theory of Nuclear Reactions to Intermediate Structure Via Doorways PDF Download

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Languages : en
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Book Description
Kawai, Kerman, and McVoy have shown that a statistical treatment of many open channels that are coupled by direct reactions leads to modifications of the Hauser- Feshbach expression for energy-averaged cross section (Ann. of Phys. 75 (1973) 156). The energy averaging interval for this cross section is on the order of the width of single particle resonances, 1MeV, revealing only a gross structure in the cross section. When the energy-averaging interval is decreased down to a width of a doorway state 0.1 MeV, a so-called intermediate structure may be observed in cross sections. We extend the Kawai-Kerman-McVoy theory into the intermediate structure by leveraging a theory of doorway states developed by Feshbach, Kerman, and Lemmer (Ann. of Phys. 42 (1967) 230). As a byproduct of the extension, an alternative derivation of the central result of the Kawai-Kerman-McVoy theory is suggested. We quantify the effect of the approximations used in derivation by performing numerical computations for a large set of compound nuclear states.

Author: Carlos A. Bertulani
Publisher:
ISBN: 9781590331415
Category : Nuclear structure
Languages : en
Pages : 0

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Book Description
Contents: Secondary beams of rare isotopes; Nucleus-nucleus scattering at high energies; Sizes and energies of exotic nuclei; Break-up reactions and momentum distributions; Borromean nuclei; Coulomb excitation; Coulomb excitation of exotic nuclei; Elastic and inelastic scattering; Pion production; Tests of fundamental interactions; Nuclear astrophysics; Fusion reactions; Formation of heavy and superheavy elements; Subject index.

Author: Richard N. Silver
Publisher: Springer Science & Business Media
ISBN: 1489925546
Category : Science
Languages : en
Pages : 400

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This volume presents the proceedings of the Workshop on Momentum Distributions held on October 24 to 26, 1988 at Argonne National Laboratory. This workshop was motivated by the enormous progress within the past few years in both experimental and theoretical studies of momentum distributions, by the growing recognition of the importance of momentum distributions to the characterization of quantum many-body systems, and especially by the realization that momentum distribution studies have much in common across the entire range of modern physics. Accordingly, the workshop was unique in that it brought together researchers in nuclear physics, electronic systems, quantum fluids and solids, and particle physics to address the common elements of momentum distribution studies. The topics dis cussed in the workshop spanned more than ten orders of magnitude range in charac teristic energy scales. The workshop included an extraordinary variety of interactions from Coulombic to hard core repulsive, from non-relativistic to extreme relativistic.

Author: Carlos A. Bertulani
Publisher: World Scientific Publishing Company Incorporated
ISBN: 9789814417662
Category : Science
Languages : en
Pages : 510

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"The book discusses how stars generate their energy through nuclear reactions, and how elements are created in stars and during the big bang. The theory of thermonuclear reactions rates and their relevance for cosmology and stellar evolution are discussed in detail. Whenever possible, the book introduces the cosmological and astrophysical concepts necessary to understand the physics context of nuclear reactions and structure theory, thermonuclear reaction rate formalism and stellar nucleosynthesis. The book discusses the topics in a self-contained way and has several end-of-chapter exercises. It can be used as a reference book for researchers working in the field of nuclear astrophysics."--Provided by publisher.

Author: Said F. Mughabghab
Publisher: Elsevier
ISBN: 0080461069
Category : Science
Languages : en
Pages : 1373

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Book Description
The Atlas of Neutron Resonances provides detailed information on neutron resonances, thermal neutron cross sections, and average resonance properties which are important to neutron physicist, astrophysicists, solid state physicists, reactor engineers, scientists involved in activation analysis, and evaluators of neutron cross sections. · Compilation and evaluation of the world's thermal neutron cross-sections and resonance parameters for neutron physicists, reactor engineers, and neutron evaluators.· Compilation and evaluation of coherent scattering lengths for solid state physicists and evaluators· Compilation and evaluation of average 30-keV capture cross sections for astrophysicists.· Nuclear level density parameters derived from average spacings of neutron resonances following a new approach (new feature for this edition).· Brief review of sub-threshold fission.· Comparisons of optical model predictions with neutron strength function data and scattering lengths.· Estimation of average E1 radiative widths on the basis of the generalized Landau-Fermi liquid model (a new feature for this edition).

Author: Ettore Gadioli
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 546

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Book Description
While we have attempted to mention at least the most important developments in the theory of pre-equilibrium reactions, the volume of work in this area over the last few years has been so immense that it is not possible to give a comprehensive account of all that has been done. Our aim is to describe as clearly as we can the main physical ideas and to sketch the mathematical formulations that have been developed to enable practical calculations to be made. We attach particular importance to the detailed comparisons between theory and experiment because only in this way is it possible to assess the usefulness and validity of the theories that have been proposed.

Author: Walter Greiner
Publisher: World Scientific
ISBN: 9814502162
Category : Science
Languages : en
Pages : 496

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Book Description
Nuclear molecules are analogous to ordinary electronic molecules. Valence nucleons are circling nuclear cores and thus bind them. They appear in collisions of nuclei on nuclei, and in fission and fusion processes. Here a lively field of research has developed over the past 20 years. Nuclear Molecules are the strongest deformed nuclear complexes and play an important role in nuclear structure (cluster) physics. They are also of considerable interest for the synthesis of elements in astrophysics (cosmology). Most of the various nuclear molecular phenomena are discussed.This book is the first monograph exclusively written to cover the theoretical aspects of nuclear molecular phenomena in heavy ion collisions. The experimental evidence is presented and confronted with theory.

Author: Peter Edward Hodgson
Publisher: World Scientific
ISBN: 9789810217228
Category : Science
Languages : en
Pages : 440

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Book Description
The nucleon optical model is widely used to calculate the elastic scattering cross-sections and polarisations for the interaction of neutrons and protons with atomic nuclei. The optical model potentials not only describe the scattering but also provide the wave functions needed to analyse a wide range of nuclear reactions. They also unify many aspects of nuclear reactions and nuclear structure. This book consists of a comprehensive introduction to the subject and a selection of papers by the author describing the optical model in detail. It contains full references to the original literature with many examples of the application of the model to the analysis of experimental data.

Author: N. A. Orr
Publisher: Springer Nature
ISBN: 3030323579
Category : Science
Languages : en
Pages : 968

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Book Description
Few-body physics covers a rich and wide variety of phenomena, ranging from the very lowest energy scales of atomic and molecular physics to high-energy particle physics. The papers contained in the present volume provide an apercu of recent progress in the field from both the theoretical and experimental perspectives and are based on work presented at the “22nd International Conference on Few-Body Problems in Physics”. This book is geared towards academics and graduate students involved in the study of systems which present few-body characteristics and those interested in the related mathematical and computational techniques.

Author: Jutta Escher
Publisher: Springer Nature
ISBN: 3030580822
Category : Science
Languages : en
Pages : 312

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Book Description
The Compound-Nuclear Reaction and Related Topics (CNR*) international workshop series was initiated in 2007 with a meeting near Yosemite National Park. It has since been held in Bordeaux (2009), Prague (2011), Sao Paulo (2013), Tokyo (2015), and Berkeley, California (2018). The workshop series brings together experts in nuclear theory, experiment, data evaluations, and applications, and fosters interactions among these groups. Topics of interest include: nuclear reaction mechanisms, optical model, direct reactions and the compound nucleus, pre-equilibrium reactions, fusion and fission, cross section measurements (direct and indirect methods), Hauser-Feshbach theory (limits and extensions), compound-nuclear decays, particle and gamma emission, level densities, strength functions, nuclear structure for compound-nuclear reactions, nuclear energy, nuclear astrophysics, and other topics. This peer-reviewed proceedings volume presents papers and poster summaries from the 6th International Workshop on Compound-Nuclear Reactions and Related Topics CNR*18, held on September 24-28, 2018, at Lawrence Berkeley National Lab, Berkeley, CA.