Köln 2025 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 40: Structure and Dynamics of Nuclei X

HK 40.3: Talk

Thursday, March 13, 2025, 14:45–15:00, HS 2 Physik

Lifetime measurements in ¹⁹⁸Pt and ²⁰⁰Pt — •Arwin Esmaylzadeh¹, Franziskus von Spee¹, Mario Ley¹, Christoph Fransen¹, Andrey Blazhev¹, Senuri Dantanarayana¹, Maximilian Droste¹, Julia Fischer¹, Jan Jolie¹, Lukas Knafla¹, Casper-David Lakenbrink¹, Richard Novak¹, Aaron Pfeil¹, and Kosuke Nomura^2,3 — ¹Universität zu Köln, Institut für Kernphysik — ²Department of Physics, Hokkaido University, Sapporo 060-0810, Japan — ³Nuclear Reaction Data Center, Hokkaido University, Sapporo 060-0810, Japan

Eight lifetimes of low-lying states in ¹⁹⁸Pt and ²⁰⁰Pt were determined using the fast-timing and the recoil distance Doppler shift methods at the Cologne CATHEDRAL spectrometer. Low-lying states were populated in the ¹⁹⁸Pt(¹⁸O, ¹⁸O)¹⁹⁸Pt* inelastic scattering and in the ¹⁹⁸Pt(¹⁸O, ¹⁶O)²⁰⁰Pt two-neutron transfer reaction,respectively. The beam was provided by the Cologne FN Tandem accelerator. In addition, four new candidates for states, five new transitions in ¹⁹⁸Pt and one new potential transition in ²⁰⁰Pt could be observed and placed in the level scheme. The newly obtained results will be discussed in the context of the tungsten-osmium-platinum region around mass A≈190. This region is known to exhibit different phenomena like a prolate-to-oblate phase transitions, but also characteristics of γ-soft nuclei. The results will be compared to mapped interacting boson model with input from the microscopic self-consistent mean-field calculation using a Gogny interaction [1].
[1] K. Nomura et al., Phys. Rev. C 84, 054316 (2011)

Keywords: Lifetime measurements; Transition strength; Nuclear structure