Theoretical Nuclear Physics
Office UT: 104 South College, (865) 974-4375
Office ORNL: 8W Building 6025, (865) 574-4580
Fax: (865) 974-7843
Atomic nuclei, the core of matter and the fuel of stars, are self-bound collections of protons and neutrons (nucleons) that interact through forces that have their origin in quantum chromo-dynamics. Nuclei comprise 99.9% of all baryonic matter in the Universe. The complex nature of the nuclear forces among protons and neutrons yields a diverse and unique variety of nuclear phenomena, which form the basis for the experimental and theoretical studies. Developing a comprehensive description of all nuclei, a long-standing goal of nuclear physics, requires theoretical and experimental investigations of rare atomic nuclei, i.e. systems with neutron-to-proton ratios larger and smaller than those naturally occurring on earth. The main area of my professional activity is the theoretical description of those exotic, short-lived nuclei that inhabit remote regions of nuclear landscape. Key scientific themes that are being addressed by my research are captured by overarching questions:
Heavy nuclei are splendid laboratories of many-body science. While the number of degrees of freedom in heavy nuclei is large, it is still very small compared to the number of electrons in a solid or atoms in a mole of gas. Nevertheless, nuclei exhibit behaviors that are emergent in nature and present in other complex systems. For instance, shell structure, symmetry breaking phenomena, collective excitations, and superconductivity are found in nuclei, atomic clusters, quantum dots, small metallic grains, and trapped atom gases.
Although the interactions of nuclear physics differ from the electromagnetic interactions that dominate chemistry, materials, and biological molecules, the theoretical methods and many of the computational techniques to solve the quantum many-body problems are shared. Examples are ab-initio and configuration interaction methods, and the Density Functional Theory, used by nuclear theorists to describe light and heavy nuclei and nucleonic matter.
Today, much interest in various fields of physics is devoted to the study
of small open quantum systems, whose properties are profoundly affected
by environment, i.e., continuum of decay channels. Although every finite
fermion system has its own characteristic features, resonance phenomena
are generic; they are great interdisciplinary unifiers. In the field of
nuclear physics, the growing interest in theory of open quantum systems
is associated with experimental efforts in producing weakly bound/unbound
nuclei close to the particle drip-lines, and studying structures and reactions
with those exotic systems. In this context, the major problem for nuclear
theory is a unification of structure and reaction aspects of nuclei, that
is based on the open quantum system many-body formalism. Solution of this
challenging problem has been advanced recently through the new-generation
continuum shell model approaches, in particular the Gamow Shell Model
based on the Berggren ensemble. The recent development of the Density-Matrix
Renormalization Group algorithm for open quantum systems within the rigged
Hilbert space formulation of quantum mechanics, enables presently fully
converged configuration interaction calculations.
Dr. Nazarewicz has taught the following courses:
Dr. Witold Nazarewicz is a Professor of Physics at both the University of Tennessee and Warsaw University, Poland. He is also a Distinguished R & D Staff at the Oak Ridge National Laboratory's Physics Division. He is also a member of the Joint Institute for Heavy Ion Research directorate. During 1999-2012 he served as the Scientific Director of the ORNL Holifield Radioactive Ion Beam Facility. He has held several visiting positions, including professorships at Lund University, the University of Cologne, Kyoto University, and the University of Liverpool.
Dr. Nazarewicz is a Fellow of the American Physical Society, the U.K. Institute of Physics, and the American Association for the Advancement of Science. He was named a 2008 Carnegie Centenary Professor by the Carnegie Trust in Scotland; received an Honorary Doctorate from University of the West of Scotland in 2009 (see write-ups from UWS and icrenfrewshire); was awarded the 2012 Tom W. Bonner Prize from the American Physical Society (see write-ups from APS and UT Physics, as well as an interview with Panorama, Polish TV2 News; and was named the 2012 Oak Ridge National Laboratory's Distinguished Scientist.
Dr. Nazarewicz is the author of nine review papers and more than 350 refereed publications in scientific journals. With ~15,000 citations and h-index ~70, he is listed by ISI among the most highly-cited physicists. He has also made more than 150 contributions to major conferences, published in their respective proceedings. He has given ~220 invited talks at major international conferences and more than 250 invited seminars and colloquia. Dr. Nazarewicz has helped organize more than 60 meetings and conferences and presently serves on 14 professional committees and editorial boards.
Rare Isotope Research
Super-Heavy Nuclei Research
Current Events (Selected)
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