Nuclear charge-exchange excitations based on a relativistic density-dependent point-coupling model

Scientific paper - Original scientific paper

• Author: Deni Vale
• Author: Y. F. Niu
• Author: Nils Paar
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

Spin-isospin transitions in nuclei away from the valley of stability are essential for the description of astrophysically relevant weak interaction processes. While they remain mainly beyond the reach of experiment, theoretical modeling provides important insight into their properties. In order to describe the spin-isospin response, the proton-neutron relativistic quasiparticle random phase approximation is formulated using the relativistic densitydependent point coupling interaction, and separable pairing interaction in both the T = 1 and T = 0 pairing channels. By implementing recently established DD- PCX interaction with improved isovector properties relevant for the description of nuclei with neutron-to-proton number asymmetry, the isobaric analog resonances (IAR) and Gamow-Teller resonances (GTR) have been investigated. In contrast to other models that usually underestimate the IAR excitation energies in Sn isotope chain, the present model accurately reproduces the experimental data, while the GTR properties depend on the isoscalar pairing interaction strength. This framework provides not only an improved description of the spin-isospin response in nuclei, but it also allows future large-scale calculations of charge-exchange excitations and weak interaction processes in stellar environment.

• Keywords (english): nuclear charge-exchange excitations; relativistic density-dependent point-coupling model
• 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. 103, no. 6, 064307
• p-ISSN: 2469-9985
• e-ISSN: 2469-9993
• DOI: https://doi.org/10.1103/PhysRevC.103.064307
• URN:NBN: urn:nbn:hr:217:516337
• Publication: 2021
• Project: Number: KK.01.1.1.01.0004; Title (english): QuantiXLie Center of Excellence; Acronym: QuantiXLie; Leader: Hrvoje Buljan, Pavle Pandžić; Jurisdiction: eu; Funding stream: European Regional Development Fund - the Competitiveness and Cohesion Operational Programme
• Document URL: https://link.aps.org/doi/10.1103/PhysRevC.103.064307
• Type of resource: Text
• Access conditions: Open access
• Public note: © 2021 American Physical Society. Received 18 December 2020; Revised 21 April 2021; Accepted 26 May 2021; Published 8 June 2021.
• Created on: 2023-08-10 08:59:17