SMuK 2023 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 21: Structure and Dynamics of Nuclei IV
HK 21.6: Vortrag
Dienstag, 21. März 2023, 18:30–18:45, SCH/A215
Isomer and excited-state lifetimes around 190W * — •Sultan Alhomaidhi1,2, E. Sahin1,2, V. Werner1, P.H. Regan3, J. Jolie4, N. Pietralla1, and J. Gerl2 — 1IKP, TU Darmstadt, Germany — 2GSI, Darmstadt, Germany — 3U Surrey, UK — 4IKP, U Köln, Germany
In March 2021, the DESPEC experiment S452 was performed at GSI. The focus of the experiment was to measure the lifetimes and energies of exited states of neutron-rich isotopes in the A∼190 mass region, to probe a predicted [1,2] prolate-oblate shape transition. The experimental setting allowed us to investigate the single-particle structures of isomers and connect their decays to the shape evolution. The main nuclei of interest, 189Ta and 190W, were populated by the fragmentation of a 208Pb primary beam impinging on a 9Be target. The cocktail beam was separated and identified using FRS to implant the nuclei of interest in AIDA. The γ rays from the implanted ions were detected by 36 LaBr3(Ce) detectors of FATIMA and 2 EUROBALL cluster detectors, surrounding AIDA. Data obtained in this experiment is analyzed on an event-by-event basis, for which the analysis is in progress. An overview of the DESPEC setup, the analysis procedures and preliminary results of the isomeric lifetime of 189Ta and the B(E2) strength of the first 2+state of 190W will be presented in the conference.
[1] J. Jolie et al., Phys. Rev. Lett. 89, 182502 (2002).
[2] J. Jolie and A. Linnemann, Phys. Rev. C 68, 031301(R), (2003).
* Supported by BMBF under Verbundprojekt 05P2021 (ErUM-FSP T07) grants 05P21PKFN1 and 05P21RDFN1.