Covariant density functional theory input for r-process simulations in actinides and superheavy nuclei: The ground state and fission properties
Abstract
A systematic investigation of the ground-state and fission properties of even-even actinides and superheavy nuclei with Z = 90–120 from the two-proton up to two-neutron drip lines with proper assessment of systematic theoretical uncertainties has been performed for the first time in the framework of covariant density functional theory (CDFT). Furthermore, these results provide a necessary theoretical input for the r-process modeling in heavy nuclei and, in particular, for the study of fission cycling. Four state-of-the-art globally tested covariant energy density functionals (CEDFs), namely, DD-PC1, DD-ME2, NL3*, and PC-PK1, representing the major classes of the CDFT models are employed in the present paper. Ground-state deformations, binding energies, two-neutron separation energies, α-decay Qα values and half-lives, and the heights of fission barriers have been calculated for all these nuclei. Theoretical uncertainties in these physical observables and their evolution as a function of proton and neutron numbers have been quantified and their major sources have been identified. Spherical shell closures at Z = 120, N = 184, and N = 258 and the structure of the single-particle (especially, high-j) states in their vicinities as well as nuclear matter properties of employed CEDFs are two major factors contributing to theoretical uncertainties. However, differentmore »
- Authors:
-
[1];
[2];
[1]
- Mississippi State Univ., Mississippi State, MS (United States)
- Mississippi State Univ., Mississippi State, MS (United States); Ghana Atomic Energy Commission, Legon (Ghana)
- Publication Date:
- Research Org.:
- Mississippi State Univ., Mississippi State, MS (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP)
- OSTI Identifier:
- 1785281
- Grant/Contract Number:
- NA0002925; SC0013037
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. C
- Additional Journal Information:
- Journal Volume: 102; Journal Issue: 5; Journal ID: ISSN 2469-9985
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Alpha decay; Fission; Nuclear binding; Nuclear density functional theory; Nuclear structure & decays; Nucleosynthesis in explosive environments; 190 ≤ A ≤ 219; A ≥ 220
Citation Formats
Taninah, A., Agbemava, S. E., and Afanasjev, A. V. Covariant density functional theory input for r-process simulations in actinides and superheavy nuclei: The ground state and fission properties. United States: N. p., 2020.
Web. doi:10.1103/physrevc.102.054330.
Taninah, A., Agbemava, S. E., & Afanasjev, A. V. Covariant density functional theory input for r-process simulations in actinides and superheavy nuclei: The ground state and fission properties. United States. https://doi.org/10.1103/physrevc.102.054330
Taninah, A., Agbemava, S. E., and Afanasjev, A. V. Mon .
"Covariant density functional theory input for r-process simulations in actinides and superheavy nuclei: The ground state and fission properties". United States. https://doi.org/10.1103/physrevc.102.054330. https://www.osti.gov/servlets/purl/1785281.
@article{osti_1785281,
title = {Covariant density functional theory input for r-process simulations in actinides and superheavy nuclei: The ground state and fission properties},
author = {Taninah, A. and Agbemava, S. E. and Afanasjev, A. V.},
abstractNote = {A systematic investigation of the ground-state and fission properties of even-even actinides and superheavy nuclei with Z = 90–120 from the two-proton up to two-neutron drip lines with proper assessment of systematic theoretical uncertainties has been performed for the first time in the framework of covariant density functional theory (CDFT). Furthermore, these results provide a necessary theoretical input for the r-process modeling in heavy nuclei and, in particular, for the study of fission cycling. Four state-of-the-art globally tested covariant energy density functionals (CEDFs), namely, DD-PC1, DD-ME2, NL3*, and PC-PK1, representing the major classes of the CDFT models are employed in the present paper. Ground-state deformations, binding energies, two-neutron separation energies, α-decay Qα values and half-lives, and the heights of fission barriers have been calculated for all these nuclei. Theoretical uncertainties in these physical observables and their evolution as a function of proton and neutron numbers have been quantified and their major sources have been identified. Spherical shell closures at Z = 120, N = 184, and N = 258 and the structure of the single-particle (especially, high-j) states in their vicinities as well as nuclear matter properties of employed CEDFs are two major factors contributing to theoretical uncertainties. However, different physical observables are affected in a different way by these two factors. For example, theoretical uncertainties in calculated ground-state deformations are affected mostly by the former factor, while theoretical uncertainties in fission barriers depend on both of these factors.},
doi = {10.1103/physrevc.102.054330},
journal = {Physical Review. C},
number = 5,
volume = 102,
place = {United States},
year = {Mon Nov 30 00:00:00 EST 2020},
month = {Mon Nov 30 00:00:00 EST 2020}
}
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Octupole deformation in the ground states of even-even nuclei: a global analysis within the covariant density functional theory
text, January 2016
- Agbemava, S. E.; Afanasjev, A. V.; Ring, P.
- arXiv
Neutron Star Mergers and Nucleosynthesis of Heavy Elements
text, January 2017
- Thielemann, F. -K.; Eichler, M.; Panov, I. V.
- arXiv
Octupole deformation in the ground states of even-even $Z\sim 96, N\sim 196$ actinides and superheavy nuclei
text, January 2017
- Agbemava, S. E.; Afanasjev, A. V.
- arXiv
Nuclear processes in Astrophysics: Recent progress
text, January 2018
- Liccardo, V.; Malheiro, M.; Hussein, M. S.
- arXiv
Cranked Relativistic Hartree-Bogoliubov Theory: Formalism and Application to the Superdeformed Bands in the $A\sim 190$ region
text, January 2000
- Afanasjev, A. V.; Ring, P.; Konig, J.
- arXiv