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HK: Fachverband Physik der Hadronen und Kerne

HK 69: Instrumentation XIX

HK 69.4: Vortrag

Donnerstag, 31. März 2022, 16:45–17:00, HK-H5

Influence of the fluorescence detection region on the determination of nuclear moments — •Patrick Müller^{1, 2}, Phillip Imgram¹, Bernhard Maaß³, and Wilfried Nörtershäuser^{1, 2} — ¹Institut für Kernphysik, TU Darmstadt, Germany — ²Helmholtz Forschungsakademie Hessen für FAIR, TU Darmstadt, Germany — ³Argonne National Laboratory, Chicago, IL, USA

Collinear laser spectroscopy (CLS) is usually used at online facilities such as CERN or NSCL to determine isotope shifts as well as nuclear moments of neutron-deficient or -rich nuclei. At the COALA experiment at the Technische Universität Darmstadt, high-precision CLS is used to provide reference values of atomic transition frequencies and nuclear moments in stable isotopes required for online experiments, but also to test new measurement schemes or technical equipment. By recording fluorescence spectra of electric dipole transitions whose linewidths are of the order of the natural linewidth, small effects which shift or deform the classical Lorentzian profile become visible, such as quantum interference or photon recoils.

We report on measurements with a new lens-based fluorescence detection region (FDR) for COALA using Ca⁺. Due to its well-defined positional and easy to adjust angular detection range, the FDR is particularly useful for investigating the influence of such geometric effects on fluorescence spectra and, therefore, on extracted nuclear moments.

Acknowledgment This work was supported by BMBF under contract 05P19RDFN1.