β decay and evolution of low-lying structure in Ge and As nuclei

Scientific paper - Original scientific paper

• Author: Kosuke Nomura
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

A simultaneous calculation for the shape evolution and the related spectroscopic properties of the low-lying states, and the β-decay properties in the even- and odd-mass Ge and As nuclei in the mass A ≈ 70–80 region, within the framework of the nuclear density functional theory and the particle-core coupling scheme, is presented. The constrained self-consistent mean-field calculations using a universal energy density functional (EDF) and a pairing interaction determines the interacting-boson Hamiltonian for the even-even core nuclei, and the essential ingredients of the particle-boson interactions for the odd-nucleon systems, and of the Gamow-Teller and Fermi transition operators. A rapid structural evolution from γ -soft oblate to prolate shapes, as well as the spherical-oblate shape coexistence around the neutron subshell closure N = 40, is suggested to occur in the even-even Ge nuclei. The predicted low-energy spectra, electromagnetic transition rates, and β-decay log f t values are in a reasonable agreement with experiment. The predicted log f t values reflect the structures of the wave functions for the initial and final nuclei of β decay, which are, to a large extent, determined by the microscopic input provided by the underlying EDF calculation.

• Keywords (english): low-lying structure
• 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. 105, no. 4, 044306
• p-ISSN: 2469-9985
• e-ISSN: 2469-9993
• DOI: https://doi.org/10.1103/PhysRevC.105.044306
• URN:NBN: urn:nbn:hr:217:383254
• Publication: 2022
• 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.105.044306
• Type of resource: Text
• Access conditions: Open access
• Public note: © 2022 American Physical Society. Received 17 February 2022; Revised 15 March 2022; Accepted 23 March 2022; Published 8 April 2022.
• Created on: 2023-09-13 19:34:27