Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HK: Fachverband Physik der Hadronen und Kerne

HK 5: Structure and Dynamics of Nuclei II

HK 5.4: Gruppenbericht

Montag, 16. März 2026, 17:15–17:45, AM 00.021

Exploring the Nuclear Structure and Collectivity of Neutron-Rich Tin Isotopes around ¹³²Sn — Maximilian Droste¹, •Peter Reiter¹, and Thorsten Kröll² — ¹IKP, Universität zu Köln — ²IKP, TU Darmstadt

Evolution of nuclear collectivity and structure in the region surrounding the doubly-magic nucleus ¹³²Sn remains a central open question in nuclear structure physics. Recent large-scale shell-model calculations, employing realistic interactions, predict an enhancement of collectivity in the even-even isotopes adjacent to ¹³²Sn. However, a long-standing discrepancy between experimental data for ¹³⁰Sn and ¹³⁴Sn and corresponding theoretical predictions has persisted. Two safe Coulomb excitation experiments were conducted at ISOLDE. Post-accelerated radioactive ion beams of ¹³⁰Sn and ¹³⁴Sn, delivered by the HIE-ISOLDE accelerator at 4.4 MeV/u, were incident on ²⁰⁶Pb and ¹⁹⁴Pt targets. The first excited states of ¹³⁰Sn and ¹³⁴Sn were selectively populated and the de-exciting γ rays were measured using the Miniball high-resolution γ-ray spectrometer in coincidence with scattered particles. The newly extracted B(E2) values provide significantly improved experimental constraints and resolve the previously observed tension between theory and experiment, offering a clearer picture of the evolution of collectivity around the N=82 shell closure.
Supported by BMBF Projects 05P21PKCI1, 05P24PKCI1, 05P21RDCI2. This project has received funding from the European Unions Horizon Research and Innovation programme under Grant Agreement No. 101057511

Keywords: Nuclear Structure; Doubly-magic; Tin isotopes; Shell-model