SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 21: Structure and Dynamics of Nuclei IV

HK 21.4: Vortrag

Dienstag, 21. März 2023, 18:00–18:15, SCH/A215

Exploring the isoscalar - isovector symmetries in 94Ru, 95Rh, 94Pd and 96Pd nuclei by means of lifetime measurements — •Biswarup Das for the DESPEC collaboration — GSI Helmholtzzentrum für Schwerionenforschung GmbH - Darmstadt, Germany

The nuclei of interest were produced in the projectile fragmentation of a 850 MeV/nucleon 124Xe beam impinging on a 4 g/cm2 9Be target, as the first of a series of commissioning *FAIR-0* experiments with the DESPEC experimental setup at the GSI- FAIR facility in Germany. The isomeric state of 94Pd and 96Pd were populated directly, whereas the β-decay of 95Pd populates the isomeric states of 94Ru and 95Rh. The nuclei were implanted on an active stopper, AIDA, and the γ-rays of interest were detected using the six triple cluster HPGe detectors as well as 36 LaBr3(Ce) detectors of the FAst Timing Detector Array (FATIMA). Direct lifetime measurements via γ- γ coincidences using FATIMA has been applied to determine the lifetimes for the yrast states below the isomer of the mentioned nuclei. The Generalised Centroid Difference (GCD) method was implemented for the lifetimes residing in the picosend regime. The transition rates were obtained from the measured lifetimes and the BE(2) values were compared with the standard shell model calculations. With the remeasured 96Pd lifetimes the new results for the 94Ru nucleus was successfully described using the Δν=2 seniority admixture allowed in the fpg model space using the Jun-45 interaction , on the other hand a large anomaly from the seniority scheme was found for the 95Rh.