SMuK 2023 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 50: Structure and Dynamics of Nuclei X
HK 50.5: Vortrag
Mittwoch, 22. März 2023, 18:45–19:00, SCH/A215
Lifetime Measurement of the 21+ and 41+ states in 60Ni using the RDDS method — •Marcel Beckers1, Claus Müller-Gatermann2, Konrad Arnswald1, Alfred Dewald1, Felix Dunkel1, Christoph Fransen1, Lisa Kornwebel1, Casper-David Lakenbrink1, and Franziskus von Spee1 — 1Institut für Kernphysik, Universität zu Köln — 2Argonne National Lab, USA
At 60Ni and surrounding Ni isotopes one can find a quite confusing situation regarding the existing experimental results. There are several data sets giving quadrupole transition strengths for the 21+ → 01+ and the 41+ → 21+ transitions that are in disagreement with each other and would lead to different physical interpretations.
Therefore, a high-precision γ-γ coincidence Recoil Distance Doppler-Shift measurement has been carried out on 60Ni to re-measure the lifetime of the 21+ and 41+ states. The new lifetime of the 21+ state supports the adopted NNDC value but disagrees with the results of two more recent Doppler-Shift Attenuation Method measurements, which suggested a longer lifetime. The new result for the 41+ state’s lifetime is significantly shorter than the one recommended in the latest NNDC compilation while also reducing its uncertainty. It therefore resolves an unclear situation, where an unexpected drop in transition strength appeared from 58Ni to 60Ni. Both values match very well with recently applied shell model calculations using the GXPF1A interaction.
Supported by the DFG, grant Nos. FR 3276/2-1 and DE 1516/5-1.