Gamow-Teller excitations at finite temperature: Competition between pairing and temperature effects

Scientific paper - Original scientific paper

• Author: E. Yüksel
• Author: N. Paar
• Author: G. Colò
• Author: E. Khan
• Author: Y. F. Niu
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

The relativistic and nonrelativistic finite temperature proton-neutron quasiparticle random phase approximation (FT-PNQRPA) methods are developed to study the interplay of the pairing and temperature effects on the Gamow-Teller excitations in open-shell nuclei, as well as to explore the model dependence of the results by using two rather different frameworks for effective nuclear interactions. The Skyrme-type functional SkM* is employed in the nonrelativistic framework, while the density-dependent meson-exchange interaction DD-ME2 is implemented in the relativistic approach. Both the isoscalar and isovector pairing interactions are taken into account within the FT-PNQRPA. Model calculations show that below the critical temperatures the Gamow-Teller excitations display a sensitivity to both the finite temperature and pairing effects, and this demonstrates the necessity for implementing both in the theoretical framework. The established FT-PNQRPA opens perspectives for the future complete and consistent description of astrophysically relevant weak interaction processes in nuclei at finite temperature such as β decays, electron capture, and neutrino-nucleus reactions.

• 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. 101, no. 4, 044305
• p-ISSN: 2469-9985
• e-ISSN: 2469-9993
• DOI: https://doi.org/10.1103/PhysRevC.101.044305
• URN:NBN: urn:nbn:hr:217:421919
• Publication: 2020
• Project: Number: KK.01.1.1.01.0004; Title (croatian): Provedba vrhunskih istraživanja u sklopu Znanstvenog centra izvrsnosti za kvantne i kompleksne sustave te reprezentacije Liejevih algebri; Acronym: ZCI QuantiXLie; Leader: Hrvoje Buljan; Jurisdiction: Croatia; Funding stream: ZC
• Document URL: https://link.aps.org/doi/10.1103/PhysRevC.101.044305
• Type of resource: Text
• Access conditions: Open access
• Public note: © 2020 American Physical Society. Received 17 September 2019; revised manuscript received 13 February 2020; accepted 18 March 2020; published 10 April 2020.
• Created on: 2020-10-09 19:32:35