SMuK 2023 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 59: Structure and Dynamics of Nuclei XI
HK 59.1: Gruppenbericht
Donnerstag, 23. März 2023, 14:00–14:30, SCH/A118
Commissioning of Miniball@HIE-ISOLDE and first results from Coulomb excitation of 130Sn — •Maximilian Droste1, Peter Reiter1, and Thorsten Kröll2 for the MINIBALL IS702 collaboration — 1IKP, Universität zu Köln, Germany — 2Institut für Kernphysik, TU Darmstadt, Germany
The high-resolution Miniball germanium array has been recommissioned at the HIE-ISOLDE facility at CERN in 2022. After successful campaigns at RIKEN, Japan and PSI, Switzerland the cryostats and capsules of the HPGe crystals have been redesigned and rebuilt. A new data acquisition system, based on FEBEX digitizers, was used for the commissioning of the array.
Coulomb excitation of 130Sn was the first experiment after LS2 at CERN. A beam of 4.4 MeV/u was delivered onto a 206Pd target. Dexciting γ-rays from target and projectile nuclei were recorded in coincidence with scattered particles. The experiment aims to investigate the evolution of nuclear structure around the magic-shell closure at N=82 tin isotopes by determining the B(E2;0g.s.+→21+) value. Most advanced SM calculations using realistic
interactions predict enhanced collectivity in the neighbouring isotopes of 132Sn [1]. Moreover, a puzzling discrepancy between previous measurements in 130Sn and latest theoretical results [2] needs 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 BMBF Projects 05P18PKCI1, 05P21PKCI1 and European Unions Horizon Europe Framework research programm (Grant Agreement No. 101057511)