Erlangen 2026 – wissenschaftliches Programm
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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