Köln 2025 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 37: Nuclear Astrophysics V
HK 37.3: Vortrag
Mittwoch, 12. März 2025, 18:15–18:30, SR 0.03 Erw. Physik
Microscopic description of beta-decay rates of r process nuclei — •Diana Alvear Terrero1,2, Gabriel Martínez-Pinedo1,2, Caroline E. P. Robin1,3, Ante Ravlić4, Thomas Neff1, Max Pallàs5, and Ariel Tarifeño-Saldivia6,5 — 1GSI Helmholtzzentrum für Schwerionenforschung, Germany — 2Technische Universität Darmstadt, Germany — 3Universität Bielefeld, Germany — 4Michigan State University, USA — 5Universitat Politècnica de Catalunya (UPC), Spain — 6Instituto de Física Corpuscular (IFIC), Spain
Beta decay rates are fundamental to understanding r-process nucleosynthesis, which is responsible for producing roughly half of the heavy elements. Existing theoretical global calculations of the rates use either Skyrme or relativistic quasiparticle random phase approximation (QRPA). These models yield very different predictions and are limited due to their treatment of nuclear many-body correlations. Many-body correlations are known to determine the low-lying beta-decay strength and consequently the decay half-lives due to their strong sensitivity to phase space. In this talk, I address the inclusion of deformation and the coupling of quasiparticles to like-particle phonons within relativistic QRPA linear response theory. The impact on the beta strength and half-lives will be discussed together with the competition of Gamow-Teller and forbidden transitions.
This work is partly supported by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (ERC Advanced Grant KILONOVA No.~885281)
Keywords: beta decay; r-process