Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 33: Poster Session II
A 33.40: Poster
Mittwoch, 7. März 2018, 16:15–18:15, Redoutensaal
Fluorescence based measurement of nuclear polarization in atomic beams. — •Abhilash Javaji1, Mark Bissell2, Robert Harding3,4, Marcus Jankowski1, Magdalena Kowalska4, Walter Neu1, and Philipp Wagenknecht1 — 1Dept. of Physics, University of Oldenburg, Oldenburg, Germany — 2School of Physics and Astronomy, Manchester University, Manchester, United Kingdom — 3Dept. of Physics, University of York, York, United Kingdom — 4EP-Dept., CERN, Geneva, Switzerland
The new laser-polarization setup at ISOLDE, CERN is dedicated to versatile studies involving β-decay asymmetry and β-NMR studies with spin-polarized radioactive ion beams. The spin-polarization is achieved via the optical pumping of atomic levels with circularly polarized laser light propagating collinearly with the ion/atom beam, which is subsequently transferred to the nuclear spin through the hyperfine interaction. Finally, the spins are decoupled in a strong magnetic field and β-decay asymmetry or its destruction can be observed. The latest venture has been the development of a fluorescence based polarization checker to be used with stable isotopes. For this purpose a 2nd laser perpendicular to the magnetic field is used to probe the sub-states of the spin polarized stable nuclei (e.g.85Rb) to determine the degree of polarization. At stronger fields, Zeeman splitting separates the magnetic sub-levels enough to be probed individually, producing fluorescence whose intensity is proportional to the population of each sub-state, thus determining the degree of nuclear polarization. The development of the setup and scheduled tests will be presented.