Mainz 2022 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 62: Structure and Dynamics of Nuclei XI

HK 62.5: Vortrag

Donnerstag, 31. März 2022, 15:15–15:30, HK-H7

Lifetime measurements of excited states in ⁵⁵Cr — •Hannah Kleis¹, Michael Seidlitz¹, Andrey Blazhev¹, Levent Kaya¹, Peter Reiter¹, Konrad Arnswald¹, Alfred Dewald¹, Maximilian Droste¹, Christoph Fransen¹, Oliver Möller^{1, 2}, Noritaka Shimizu³, Yusuke Tsunoda³, Yutaka Utsuno^{3, 4}, Peter von Brentano¹, and Karl-Oskar Zell¹ — ¹Institut für Kernphysik, Universität zu Köln — ²Institut für Kernphysik, Technische Universität Darmstadt — ³Center for Nuclear Study, The University of Tokyo — ⁴Advanced Science Research Center, Japan Atomic Energy Agency

Lifetime measurements in neutron-rich Cr nuclei provide key observables to study the N=32 sub-shell closure. Following an earlier measurement in ⁵⁶Cr [1], excited states in the neighboring N=31 isotope ⁵⁵Cr have been populated in a ⁴⁸Ca(¹¹B, p3n) ⁵⁵Cr fusion-evaporation reaction at a beam energy of 32 MeV at the FN tandem accelerator of the University of Cologne. The recoil-distance Doppler-shift method combined with the differential decay-curve method are utilized for γ γ-coincidence analyses in order to determine precise lifetimes for the first 5/2⁻ and 9/2⁻ states of τ = 5.61(28) ps and τ = 6.33(46) ps, respectively [2]. In addition, the experimentally determined transition probabilities were confronted with results from the KB3G, FPD6, GXPF1A and GXPF1Br shell-model interactions. In particular, the B(E2) and B(M1) strengths are discussed with respect to the calculated wave functions configurations.

[1] M. Seidlitz et al., Phys. Rev. C 84, 034318 (2011)

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