Investigation Of Finite Temperature And Continuum Effects On Nuclear Excitations
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Author | : Herlik Wibowo |
Publisher | : |
Total Pages | : 179 |
Release | : 2020 |
Genre | : Nuclear excitation |
ISBN | : |
The low-energy nuclear response at finite-temperature significantly affects the radiative neutron capture reaction rates of the r-process nucleosynthesis. In order to address this topic, the first part of this study focuses on the response of compound nuclei or nuclei at finite temperature. The thermal nuclear response satisfies the Bethe-Salpeter equation (BSE) with the static and dynamical kernels of different origins. While the origin of the static kernel is the nearly instantaneous nucleon-meson interaction, the dynamical kernel is induced by the coupling between nucleons and phonons. The presence of singularities in the dynamical kernel makes the BSE unsolvable, however, a time projection technique known for the zero-temperature case allows for constructing a hierarchy of feasible approximations. In this study a temperature-dependent projection operator on the subspace of the imaginary time was found to generalize the method to finite temperatures. The method named the finite-temperature relativistic time blocking approximation (FT-RTBA), is implemented numerically to calculate the multipole responses of medium-mass and heavy nuclei. This study reveals common phenomena that occur for all thermal multipole responses: the disappearance of the high-frequency collective motion at very high temperature and arising prominent low-energy strength of thermal origin. The inclusion of pairing correlations and continuum effects is essential for an accurate microscopic description of the nuclear response of the exotic nuclei far from the valley of beta-stability and close to the drip-lines. Therefore, the second part of this study aims to extend the current zero-temperature nuclear response theory, which is based on the contact effective interactions between nucleons and takes into account the pairing correlations within the framework of the BCS approximation and exact coupling to the continuum. This extension involves the application of the time-blocking approximation in the coordinate space representation to incorporate the coupling between nucleons and phonons, which is the leading-order mechanism of the fragmentation of the nuclear multipole responses at both low- and high-frequency domains.
Author | : P. F. Bortignon |
Publisher | : |
Total Pages | : |
Release | : 1985 |
Genre | : |
ISBN | : |
Author | : P. F. Bortignon |
Publisher | : |
Total Pages | : 15 |
Release | : 1986 |
Genre | : |
ISBN | : |
Author | : Noah R. Johnson |
Publisher | : Elsevier |
Total Pages | : 766 |
Release | : 2016-06-03 |
Genre | : Science |
ISBN | : 1483265307 |
Proceedings of the Conference on Nuclear Structure in the Nineties
Author | : |
Publisher | : |
Total Pages | : 544 |
Release | : 1994-06 |
Genre | : Power resources |
ISBN | : |
Author | : Joseph H Hamilton |
Publisher | : World Scientific |
Total Pages | : 366 |
Release | : 1993-07-31 |
Genre | : |
ISBN | : 9814555320 |
This symposium on Reflections and Directions in Low Energy Heavy-Ion Physics celebrates twenty years of the University Isotope Separator at Oak Ridge (UNISOR) and ten years of the Joint Institute for Heavy Ion Research (JIHIR). It reflects on the accomplishments in low energy heavy-ion science and emphasizes the new directions and opportunities to be explored with low energy heavy-ion facilities. It includes a special section devoted to structure theory and another emphasizing new research to result from facilities exhibiting radioactive ion beam capabilities, new generation recoil mass spectrometers and sophisticated gamma-ray detector arrays. With the participation of leading researchers in the field, the proceedings of this conference is a major reference work for graduate students and research workers in nuclear physics.
Author | : G Reffo |
Publisher | : World Scientific |
Total Pages | : 266 |
Release | : 1992-05-30 |
Genre | : |
ISBN | : 9814554499 |
This volume collects the papers presented at the “Specialists' Meeting on Nuclear Level Densities”, held in Bologna 15 - 17 November, 1989, which gathered most of the scientists working in the field. The papers cover all the major aspects of the level density problem both from the theoretical and the experimental viewpoint, including the subject of partial level densities. In particular, moment method, collective vector method, interacting boson model, static path approximation and combinatorial approach are discussed. Effects of the residual interactions and nuclear structure are also addressed, giving a state-of-art reveiw of our present knowledge on nuclear level densities.
Author | : Vladimir M Kolomietz |
Publisher | : World Scientific |
Total Pages | : 586 |
Release | : 2020-05-08 |
Genre | : Science |
ISBN | : 9811211795 |
This book describes recent theoretical and experimental developments in the study of static and dynamic properties of atomic nuclei, many-body systems of strongly interacting neutrons and protons. The theoretical approach is based on the concept of the mean field, describing the motion of a nucleon in terms of a self-consistent single-particle potential well which approximates the interactions of a nucleon with all the other nucleons. The theoretical approaches also go beyond the mean-field approximation by including the effects of two-body collisions.The self-consistent mean-field approximation is derived using the effective nucleon-nucleon Skyrme-type interaction. The many-body problem is described next in terms of the Wigner phase space of the one-body density, which provides a basis for semi-classical approximations and leads to kinetic equations. Results of static properties of nuclei and properties associated with small amplitude dynamics are also presented. Relaxation processes, due to nucleon-nucleon collisions, are discussed next, followed by instability and large amplitude motion of excited nuclei. Lastly, the book ends with the dynamics of hot nuclei. The concepts and methods developed in this book can be used for describing properties of other many-body systems.
Author | : Roger Arthur Freedman |
Publisher | : |
Total Pages | : 484 |
Release | : 1978 |
Genre | : Many-body problem |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 1776 |
Release | : 1965 |
Genre | : Science |
ISBN | : |