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HK: Fachverband Physik der Hadronen und Kerne

HK 30: Structure and Dynamics of Nuclei VII

HK 30.1: Gruppenbericht

Dienstag, 12. März 2024, 17:30–18:00, HBR 19: C 5b

Absolute electromagnetic transition rates in semi-magic N = 50 isotones as a test for (π g_9/2)ⁿ single particle calculations. — Mario Ley¹, •Jan Jolie¹, Arwin Esmaylzadeh¹, Andreas Harter¹, Lukas Knafla¹, Aaron Pfeil¹, Andrey Blazhev¹, Christoph Fransen¹, Jean-Marc Regis¹, and Piet Van Isacker² — ¹Institut fuer Kernphysik, Universitaet zu Koeln, Zuelpicher Str. 77, D-50937 Koeln, Germany — ²GANIL, Bvd. Henri Becquerel, F-14076 Caen, France

Single-j calculations for (j)ⁿ configurations with n = 3,..,2j+1 can be performed using a semi-empirical approach, provided that the energies and absolute electromagnetic transition rates are known for the two-particle (hole) nucleus. This approach was already successfully applied in the case of protons in the (π h_9/2)³ nucleus ²¹¹At [1]. At the Cologne Tandem Accelerator of the Institute for Nuclear Physics we have tested these relations by measuring lifetimes of excited states in the (π g_9/2)ⁿ isotones with N = 50. We started the studies in the two-proton nucleus ⁹²Mo where the previously unknown B(E2:4₁⁺ → 2₁⁺) value, was measured with high precision using the electronic γ − γ fast timing technique [2]. Subsequently we applied the same technique in ⁹³Tc and ⁹⁴Ru [3]. Work supported by DFG Grant JO391/18-1.

[1] V. Karayonchev, et al., Phys. Rev. C 106, 044321 (2022). [2] M. Ley, L. Knafla, J. Jolie, A. Esmaylzadeh, A. Harter, A. Blazhev, C. Fransen, A. Pfeil, J.-M. Regis, P. Van Isacker, accepted for publication in Phys. Rev. C (2023). [3] M. Ley, et al., to be submitted to Phys. Rev. C.

Keywords: Seniority; N = 50 isotones; lifetime measurement; absolute electromagnetic transition rates