Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 37: Structure and Dynamics of Nuclei VII

HK 37.7: Talk

Wednesday, April 1, 2020, 18:15–18:30, J-HS E

TDRIV g factor measurement of the 2₁⁺ state of ¹⁸O — •J. Wiederhold¹, V. Werner¹, C. Fransen², C. Müller-Gatermann², N. Pietralla¹, M. Beckers², M. Berger¹, A. Blazhev², A. Dewald², A. Goldkuhle², P.R. John¹, J. Jolie², R. Kern¹, C. Stahl¹, S. Thiel², W. Witt¹, and R. Zidarova¹ — ¹IKP, TU Darmstadt — ²IKP, Universität zu Köln

Magnetic dipole moments are an important indicator of the proton neutron wave function composition and therefore the single-particle properties of the investigated excited states. The available experimental data for sd shell nuclei can overall be reproduced by shell model calculations, but deviations exist at the edges, i.e. for ¹⁸O and ³⁸Ar. To clarify the picture for ¹⁸O, a g factor measurement has been performed at the IKP Cologne, employing the electron-configuration-reset time-differential recoil-in-vacuum technique [1]. The technique is based on the traditional TDRIV method, but the excited ions are not stopped but only attenuated in a degrader foil and can be detected by a particle detector. Excited states of ¹⁸O were populated by Coulomb excitation on a ⁵⁸Ni target. The experimental setup consisted of the HORUS detector array in combination with the DARCY plunger device and a double-sided silicon strip detector. The obtained results for the g-factor measurement will be presented.
*Supported by the DFG under Grant No. SFB 1245 and by the BMBF under the Grants No. 05P18RDFN9, and 05P19RDFN1 within the collaboration 05P2018 NuSTAR R&D.
[1] A. Stuchbery et al., Phys. Rev. C 71,047302 (2005).