SMuK 2023 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 21: Structure and Dynamics of Nuclei IV
HK 21.3: Vortrag
Dienstag, 21. März 2023, 17:45–18:00, SCH/A215
Investigation of shape coexistence in 116Te via lifetime measurements — •Franziskus v. Spee1, Marcel Beckers1, Andrey Blazhev1, Arwin Esmaylzadeh1, Felix Dunkel1, Christoph Fransen1, Jan Jolie1, Lisa Kornwebel1, Casper-David Lakenbrink1, and Claus Müller-Gatermann2 — 1Institut für Kernphysik, Cologne, Germany — 2Physics Division, Argonne National Laboratory, Argonne, Illinois, USA
In mid-shell Te isotopes, hints for shape coexistence have been found [1]. However, experimental evidence is scarce, since experiments on neutron-deficient Te isotopes are challenging. Experimental data on transition strengths in 116Te could give further insight. Therefore, a recoil distance Doppler shift experiment was performed to investigate transition strengths between low-lying states in 116Te at the FN-Tandem accelerator facility of the IKP Cologne. To populate low-lying, low-spin states, the reaction 112Sn(12C,8Be)116Te was used. The γ rays were detected in coincidence with α particles stemming from the decay of 8Be. To detect the α particles, silicon particle detectors were used. These were covered with aluminum foil that prevented any heavier ions to penetrate the detector. This results in very clean γ spectra even though the cross section for the reaction of interest is rather low. This allowed for the first-time determination of lifetimes of low-lying off-yrast states. This work was supported by the Deutsche Forschungsgemeinschaft (DFG) under contract numbers FR 3276/2-1 and DE 1516/5-1.
[1] P. Garrett et al., Prog. Part. Nucl. Phys. 124 (2022) 103931.