Mississippi State University
Covariant density functional theory: Global performance and rotating nuclei.
Degree: PhD, Physics and Astronomy, 2017, Mississippi State University
Covariant density functional theory (CDFT) is a modern theoretical tool for the description
of nuclear structure physics. Here different physical properties of the ground
and excited states in atomic nuclei have been investigated within the CDFT framework
employing three major classes of the state-of-the-art covariant energy density functionals. The global performance of CEDFs for even-even nuclei are investigated and the <i>systematic
theoretical uncertainties</i> are estimated within the set of four CEDFs in known regions
of the nuclear chart and their propagation towards the neutron drip line. Large-scale axial
relativistic Hartree-Bogoliubov (RHB) calculations are performed for even-even nuclei to
calculate different ground state observabvles. The predictions for the two-neutron drip line
are also compared in a systematic way with the non-relativistic results. CDFT has been applied for systematic study of extremely deformed, rotating <i>N ∼ Z</i>
nuclei of the <i>A</i> ∼ 40 mass region. At spin zero such structures are located at high energies
which prevents their experimental observation. The rotation acts as a tool to bring these
exotic shapes down to the yrast line so that their observation could become possible with
a future generation detectors such as GRETA or AGATA. The major physical observables
of such structures, the underlying single-particle structure and the spins at which they
become yrast or near yrast are defined. The search for the fingerprints of clusterization and
molecular structures is performed and the configurations with such features are discussed. CDFT has been applied to study fission barriers of superheavy nuclei and related systematic
theoretical uncertainties in the predictions of inner fission barrier heights in superheavy
elements. Systematic uncertainties are substantial in superheavy elements and their
behavior as a function of proton and neutron numbers contains a large random component.
The benchmarking of the functionals to the experimental data on fission barriers in the
actinides allows reduction of the systematic theoretical uncertainties for the inner fission
barriers of unknown superheavy elements. However, even then they on average increase
when moving away from the region where benchmarking has been performed.
Advisors/Committee Members: Gautam Rupak Lan Tai Moong (committee member), Jeffry A. Winger (committee member), Dipangkar Dutta (committee member), Yaroslav Koshka (committee member), Anatoli Afanasjev (committee member).
Subjects/Keywords: super heavy elements; superdeformation; megadeformation; hyperdeformation; fission barriers; theoretical uncertainties; driplines; covariant density functional theory
to Zotero / EndNote / Reference
APA (6th Edition):
Ray, D. (2017). Covariant density functional theory: Global performance and rotating nuclei. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-03222017-171244/ ;
Chicago Manual of Style (16th Edition):
Ray, Debisree. “Covariant density functional theory: Global performance and rotating nuclei.” 2017. Doctoral Dissertation, Mississippi State University. Accessed March 25, 2018.
MLA Handbook (7th Edition):
Ray, Debisree. “Covariant density functional theory: Global performance and rotating nuclei.” 2017. Web. 25 Mar 2018.
Ray D. Covariant density functional theory: Global performance and rotating nuclei. [Internet] [Doctoral dissertation]. Mississippi State University; 2017. [cited 2018 Mar 25].
Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03222017-171244/ ;.
Council of Science Editors:
Ray D. Covariant density functional theory: Global performance and rotating nuclei. [Doctoral Dissertation]. Mississippi State University; 2017. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03222017-171244/ ;