SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 50: Structure and Dynamics of Nuclei X

HK 50.4: Vortrag

Mittwoch, 22. März 2023, 18:30–18:45, SCH/A215

Lifetime measurements of excited states in ⁵⁹Ni and ⁵⁷Fe — •Ramona Burggraf, Erik Gaßmus, Peter Reiter, Konrad Arnswald, Andrey Blazhev, Maximilian Droste, Christoph Fransen, and Hannah Kleis — IKP, Universität zu Köln

Lifetime measurements of excited states in nuclei along the N=31 chain were used to corroborate the N=32 sub-shell closure [1], as done previously in ⁵⁵Cr [2]. Systematic studies including the neighboring N=31 isotones suffer from imprecise experimental values. Excited states in ⁵⁹Ni and ⁵⁷Fe have been populated in ⁵¹V(¹²C, p3n) and ⁵¹V(¹²C, pnα) fusion-evaporation reactions at a beam energy of 55 MeV at the FN tandem accelerator of the University of Cologne. The Cologne plunger device, surrounded by an efficient γ-ray detector array was employed to determine lifetimes with the recoil-distance Doppler-shift method and the differential decay-curve method. Lifetimes and reduced transition strengths for several excited states in ⁵⁹Ni and ⁵⁷Fe were determined. Considerable deviations from previous experimental findings were observed. Comparison with results from new shell-model calculations employing the GXPF1A interaction show remarkable agreement with the present values.

[1] D. Steppenbeck et al., Nature 502, 7470 (2013)

[2] H.Kleis et al., Phys. Rev. C 104, 034310 (2021)