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HK: Fachverband Physik der Hadronen und Kerne
HK 65: Structure and Dynamics of Nuclei XII
HK 65.3: Talk
Thursday, March 14, 2024, 16:30–16:45, HBR 19: C 5a
Probing the doubly magic shell closure at 132Sn by Coulomb excitation of neutron-rich 130Sn — •Maximilian Droste1, Peter Reiter1, and Thorsten Kröll2 for the MINIBALL IS702 collaboration — 1IKP, Universität zu Köln, Germany — 2IKP, Technische Universität Darmstadt, Germany
Excited states of 130Sn, the even-even neighbour of the doubly-magic nucleus 132Sn, were populated via safe Coulomb excitation employing the recently commissioned, highly efficient MINIBALL array. The 130Sn ions were accelerated by the HIE-ISOLDE accelerator to an energy of 4.4 MeV/u and impinged onto a 206Pb target.
Deexciting γ rays have been recorded in coincidence with scattered particles. Besides γ rays from the first 2+ state, deexcitation from higher-lying states was observed. The latter is caused by an isomeric 130Sn7− beam component.
Reduced transition strengths for the 0g.s.+ → 21+ 130Sn will illucidate the evolution of collectivity and nuclear structure around the magic shell closure at N=82, Z=50 tin isotopes. Advanced shell model calculations predict enhanced collectivity in the neighbouring isotopes of 132Sn [1]. Moreover, a puzzling discrepancy between previous measurements in 130Sn and latest theoretical results [2] awaits to be resolved.
[1] D. Rosiak et al. Phys. Rev. Lett. 121, 252501 (2018)
[2] T. Togashi et al. Phys. Rev. Lett. 121, 062501 (2018)
Supported by the German BMBF 05P21PKFN9, 05P21RDCI2 and European Union’s Horizon Europe Framework research and innovation programme under grant agreement No. 101057511.
Keywords: Nuclear structure; Doubly-magic nuclei; 130Sn; MINIBALL; ISOLDE