Islands of shape coexistence from single-particle spectra in covariant density functional theory

Scientific paper - Original scientific paper

• Author: Dennis Bonatsos
• Author: K. E. Karakatsanis
• Author: Andriana Martinou
• Author: T. J. Mertzimekis
• Author: N. Minkov
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

Using covariant density functional theory with the DDME2 functional and labeling single-particle energy orbitals by Nilsson quantum numbers, a search for particle-hole (p-h) excitations connected to the appearance of shape coexistence is performed for Z=38 to 84. Islands of shape coexistence are found near the magic numbers Z=82 and Z=50, restricted in regions around the relevant neutron midshells N=104 and N=66, respectively, in accordance with the well-accepted p-h interpretation of shape coexistence in these regions, which we call neutron-induced shape coexistence, since the neutrons act as elevators creating holes in the proton orbitals. Similar but smaller islands of shape coexistence are found near N=90 and N=60, restricted in regions around the relevant proton midshells Z=66 and Z=39, respectively, related to p-h excitations across the three-dimensional isotropic harmonic-oscillator magic numbers N=112 and N=70, which correspond to the beginning of the participation of the opposite parity orbitals 1i13/2 and 1h11/2, respectively, to the onset of deformation. We call this case proton-induced shape coexistence, since the protons act as elevators creating holes in the neutron orbitals, thus offering a possible microscopic mechanism for the appearance of shape coexistence in these regions. In the region around N=40, Z=40, an island is located on which both neutron p-h excitations and proton p-h excitations are present.

• Keywords (english): covariant density functional theory
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Physical Review C
• Numbering: vol. 106, no. 4, 044323
• p-ISSN: 2469-9985
• e-ISSN: 2469-9993
• DOI: https://doi.org/10.1103/PhysRevC.106.044323
• URN:NBN: urn:nbn:hr:217:498988
• Publication: 2022-10-21
• Project: Number: TTP-2018-07-3554; Title (croatian): Exotic Nuclear Structure and Dynamics; Title (english): Exotic Nuclear Structure and Dynamics; Acronym: ExoNSD; Leader: Kosuke Nomura; Jurisdiction: Croatia; Funding stream: TTP
• Document URL: https://link.aps.org/doi/10.1103/PhysRevC.106.044323
• Type of resource: Text
• Access conditions: Open access
• Public note: © 2022 American Physical Society. Received 12 June 2022; Accepted 30 September 2022; Published 21 October 2022.
• Created on: 2023-08-17 10:04:12