Köln 2025 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 40: Structure and Dynamics of Nuclei X
HK 40.1: Group Report
Thursday, March 13, 2025, 14:00–14:30, HS 2 Physik
Lifetime measurement in N= 50 isotones to investigate seniority conservation in the π g9/2 orbital — •Mario Ley1, Jan Jolie1, Piet Van Isacker2, Andrey Blazhev1, Arwin Esmaylzadeh1, Christoph Fransen1, Lukas Knafla1, Aaron Pfeil1, and Jean-Marc Régis1 — 1Universität zu Köln, Institut für Kernphysik — 2Grand Accélérateur National d’Ions Lourds, Caen, France
Excited states in the N= 50 semi-magic nuclei 92Mo, 93Tc, 94Ru and 95Rh were populated using fusion-evaporation reactions at the Cologne FN Tandem accelerator, and their lifetimes were measured with a hybrid setup of HPGe and LaBr detectors using the fast-timing method. The lifetime of the 41+ state in 92Mo was measured with high precision to derive state-dependent effective charges from the B(E2) values of the yrast band [1]. In 94Ru the lifetime of the 41+ state was measured with high statistics [2]. The results were compared with theoretical predictions from semiempirical calculations in the single-j orbital for the protons and shell-model calculations using the SR88MHJM interaction in the π(1p1/2, 0g9/2) model space [2]. Preliminary results of lifetime measurements in 95Rh will be presented.
Work supported by DFG Grant JO391/18-2
[1] Phys. Rev. C 108, 064313 (2023)
[2] Phys. Rev. C 110, 034320 (2024)
Keywords: lifetime measurement; N=50; seniority