Two-neutrino double-beta decay in the mapped interacting boson model

Scientific paper - Original scientific paper

• Author: Kosuke Nomura https://orcid.org/0000-0001-7663-6775
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics); (Theoretical Physics Department)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics; Nuclear Physics

Abstract (english)

A calculation of two-neutrino double- β ( 2 ν β β ) decay matrix elements within the interacting boson model (IBM) that is based on the nuclear density functional theory is presented. The constrained self-consistent mean-field (SCMF) calculation using a universal energy density functional (EDF) and a pairing interaction provides potential energy surfaces with triaxial quadrupole degrees of freedom for even-even nuclei corresponding to the initial and final states of the 2 ν β β decays of interest. The SCMF energy surface is then mapped onto the bosonic one, and this procedure determines the IBM Hamiltonian for the even-even nuclei. The same SCMF calculation provides the essential ingredients of the interacting boson fermion-fermion model (IBFFM) for the intermediate odd-odd nuclei and the Gamow-Teller and Fermi transition operators. The EDF-based IBM and IBFFM provide a simultaneous description of excitation spectra and electromagnetic transition rates for each nucleus, and single- β and β β decay properties. The calculated 2 ν β β -decay nuclear matrix elements are compared with experiment and with those from earlier theoretical calculations.

• Keywords (english): double beta decay, beta decay, nuclear 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, pp. 044301-1-044301-27, 27
• p-ISSN: 2469-9985
• e-ISSN: 2469-9993
• DOI: https://doi.org/10.1103/PhysRevC.105.044301
• URN:NBN: urn:nbn:hr:217:440222
• 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.105.044301
• Type of resource: Text
• Access conditions: Restricted access
• Created on: 2022-09-10 10:59:43