Speaker
Description
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 $(\pi g_{9/2})^3$ nucleus $^{211}At$ [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 $(\pi g_{9/2})^n$ isotones with N = 50. We started the studies in the two proton nucleus $^{92}𝑀𝑜$ where the previously unknown $B(E2:4^+_1 → 2^+_1 )$ value, was measured with high precision using the electronic $\gamma - \gamma$ fast timing technique [2]. Subsequently we applied the same technique in $^{93}Tc$ and $^{94}Ru$ [3] and $^{95}Rh$ [4]. Emphasis will be made on the comparison with recent radioactive ion beam experiments.
Work supported by DFG Grant JO391/18-2.
[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, Phys.Rev. C 108 (2023) 064313.
[3] M. Ley, J. Jolie, A. Blazhev, L. Knafla, A. Esmayalzadeh, C. Fransen, A Pfeil, J.M. Régis, P. Van Isacker, Phys. Rev. C 110, 034320 (2024).
[4] M. Ley, , J. Jolie, A. Esmayalzadeh, A. Blazhev, J. Fischer, C. Fransen, A Pfeil, P. Van Isacker, in preparation for Phys. Rev. C (2025)
