Köln 2025 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 7: Structure and Dynamics of Nuclei III
HK 7.3: Vortrag
Montag, 10. März 2025, 17:15–17:30, HS 2 Physik
Investigation of 172Pt via lifetime measurement — •Casper-David Lakenbrink1,2, Christoph Fransen1, Claus Müller-Gatermann2, Michael P. Carpenter2, Felix Dunkel1, Jan Jolie1, and Franziskus von Spee1 — 1Institute for Nuclear Physics, University of Cologne, 50937 Cologne, Germany — 2Physics Division, Argonne National Laboratory, Lemont, IL-60439, USA
The very neutron-deficient Pt, Os and W isotopes around A = 170 show an unexpected behavior of B(E2) transition strengths within the yrast band with ratios B4/2<1, which cannot be explained with standard collective models. Shape coexistence lends itself as a possible explanation as this phenomenon is well established in the nearby mid-shell Pt isotopes. The backbending seen in the levelschemes of these nuclei could in this framework be interpreted as a crossing of two different configurations. A different approach was able to reproduce these anomalies without configuration mixing by including 3-body interactions in the IBM (F. Pan et al., PRC 110, 054324 (2024)).
Lifetimes up to the 81+ state in 172Pt were measured in this work to determine yrast E2 transition strengths to test these hypotheses. The experiment employed the recoil distance Doppler-shift (RDDS) method and was performed at Argonne National Laboratory.
This work was supported by the Deutsche Forschungsgemeinschaft (DFG) under contract number FR 3276/3-1 and by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under contract number DE-AC02-06CH11357. It used resources of ANL’s ATLAS facility, which is a DOE Office of Science User Facility.
Keywords: nuclear structure; exotic nuclei; lifetime measurement; RDDS