Finite-temperature effects in magnetic dipole transitions

Znanstveni rad - Izvorni znanstveni rad

• Autor: Amandeep Kaur
• Autor: Esra Yüksel
• Autor: Nils Paar
• Autorova ustanova: Sveučilište u Zagrebu; Prirodoslovno-matematički fakultet; (Fizički odsjek)
• Znanstveno / umjetničko područje, polje i grana: PRIRODNE ZNANOSTI; Fizika

Sažetak (engleski)

Finite-temperature effects in electromagnetic transitions in nuclei contribute to many aspects of nuclear structure and astrophysically relevant nuclear reactions. While electric dipole transitions have already been extensively studied, the temperature sensitivity of magnetic transitions remains largely unknown. This work comprises the study of isovector magnetic dipole excitations (𝑀⁢1) occurring between spin-orbit (SO) partner states using the recently developed self-consistent finite-temperature relativistic quasiparticle random-phase approximation (FT-RQRPA) in the temperature range from 𝑇= 0 to 2 MeV. The 𝑀⁢1 strength distributions of 40−60Ca and 100−140Sn isotopic chains exhibit a considerable temperature dependence. The 𝑀⁢1 strength peaks shift significantly towards the lower energies due to the decrease in SO splitting energies and weakening of the residual interaction, especially above the critical temperatures where the pairing correlations vanish. By exploring the relevant two-quasiparticle configurations contributing to the 𝑀⁢1 strength of closed- and open-shell nuclei, new proton and neutron excitation channels between SO partners are observed in low- and high-energy regions due to the thermal unblocking effects around the Fermi level. At higher temperatures, we have noticed an interesting result in 40,60Ca nuclei, the appearance of 𝑀⁢1 excitations, which are forbidden at zero temperature due to fully occupied (or fully vacant) spin-orbit partner states.

• Ključne riječi (engleski): finite-temperature effects; magnetic dipole transitions
• Jezik: engleski
• Vrsta publikacije: Znanstveni rad - Izvorni znanstveni rad
• Status objave: Objavljen
• Vrsta recenzije: Recenziran - međunarodna recenzija
• Verzija publikacije: Objavljena verzija rada (izdavačev PDF)
• Naslov časopisa: Physical Review C
• Brojčani podaci: vol. 109, br. 2, 024305
• p-ISSN: 2469-9985
• e-ISSN: 2469-9993
• DOI: https://doi.org/10.1103/PhysRevC.109.024305
• URN:NBN: urn:nbn:hr:217:241410
• Datum objave publikacije: 2024
• Projekt: Šifra: IP-2022-10-7773; Naziv (hrvatski): Relativistička nuklearna višečestična teorija u doba opažanja raznovrsnih signala; Naziv (engleski): Relativistic nuclear many-body theory in the multimessenger observation era; Kratica: RELANUM; Voditelj: Nils Paar; Pravna nadležnost: Hrvatska; Financijer: Hrvatska zaklada za znanost; Linija financiranja: Research Projects
• URL dokumenta: https://link.aps.org/doi/10.1103/PhysRevC.109.024305
• Vrsta resursa: Tekst
• Prava pristupa: Otvoreni pristup
• Javna napomena: © 2024 American Physical Society. Received 13 October 2023. Accepted 22 January 2024. Published 6 February 2024.
• Datum i vrijeme pohrane: 2024-07-29 12:36:21