SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 41: Structure and Dynamics of Nuclei VII

HK 41.3: Vortrag

Mittwoch, 22. März 2023, 16:30–16:45, SCH/A118

Lifetime measurement of excited states in ¹¹⁶Xe — •Casper-David Lakenbrink¹, Marcel Beckers¹, Andrey Blazhev¹, Felix Dunkel¹, Arwin Esmaylzadeh¹, Christoph Fransen¹, Jan Jolie¹, Lisa Kornwebel¹, Claus Müller-Gatermann², and Franziskus v. Spee¹ — ¹IKP, Universität zu Köln, Deutschland — ²Physics Division, Argonne National Laboratory, IL , USA

In the Sn, Te and Xe isotope chains, previous experiments showed a drop for the B_4/2=B(E2;4₁⁺ → 2₁⁺)/B(E2;2₁⁺ → 0₁⁺) ratio of nuclei with mass A ≤ 114. If this is caused by a shell effect, as is expected, the drop should correspond to the neutron number rather than the mass number and would be expected to happen at ¹¹⁶Xe already. Transition strengths in ¹¹⁶Xe have only once been measured using singles spectra, possibly suffering from undetected feeding. Thus, lifetimes in ¹¹⁶Xe were evaluated using γγ-coincidence data from a recoil-distance Doppler-shift experiment to investigate transition strengths without the need for assumptions on feeding. Excited states in ¹¹⁶Xe were populated in the fusion-evaporation reaction ¹⁰²Pd(¹⁶O,2n)¹¹⁶Xe at the FN-tandem accelerator at the Institute for Nuclear Physics, University of Cologne. Lifetimes of the 2₁⁺, 4₁⁺ and 6₁⁺ states were evaluated using the differential decay-curve method as well as the lifetime of the 7₁⁻ state using simulations of spectra considering Doppler-shift attenuation effects. The corresponding B(E2), B(E1) values were calculated. We will present the results and compare these to a previous measurement as well as IBM1 calculations. This work was supported by the DFG, grant Nos. FR 3276/2-1 and DE 1516/5-1.