Development of a polarized 31Mg+ beam as a spin-1/2 probe for BNMR

A 28 keV beam of 31 Mg + ions was extracted from a uranium carbide, proton-beam-irradiated target coupled to a laser ion source. The ion beam was nuclear-spin polarized by collinear optical pumping on the 2 S 1 / 2 – 2 P 1 / 2 transition at 280 nm. The polarization was preserved by an extended 1 mT...

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Bibliographic Details
Published in:Hyperfine interactions 2016, Vol.237 (1), p.1-7, Article 162
Main Authors: Levy, C. D. P., Pearson, M. R., Dehn, M. H., Karner, V. L., Kiefl, R. F., Lassen, J., Li, R., MacFarlane, W. A., McFadden, R. M. L., Morris, G. D., Stachura, M., Teigelhöfer, A., Voss, A.
Format: Article
Language:English
Subjects:
16–19 May 2016
Asymmetry
Atomic
Bends
Beta decay
Condensed Matter Physics
Ground state
Hadrons
Heavy Ions
Ion beams
Ion sources
Light sources
Molecular
Nuclear Physics
Optical and Plasma Physics
Optical pumping
Physics
Physics and Astronomy
Poland
Polarization
Poznań
Proceedings of the 10th International Workshop on Application of Lasers and Storage Devices in Atomic Nuclei Research: “Recent Achievements and Future Prospects” (LASER 2016)
Proton beams
Segmentation
Single crystals
Surfaces and Interfaces
Thin Films
Uranium
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Summary:A 28 keV beam of 31 Mg + ions was extracted from a uranium carbide, proton-beam-irradiated target coupled to a laser ion source. The ion beam was nuclear-spin polarized by collinear optical pumping on the 2 S 1 / 2 – 2 P 1 / 2 transition at 280 nm. The polarization was preserved by an extended 1 mT guide field as the beam was transported via electrostatic bends into a 2.5 T longitudinal magnetic field. There the beam was implanted into a single crystal MgO target and the beta decay asymmetry was measured. Both hyperfine ground states were optically pumped with a single frequency light source, using segmentation of the beam energy, which boosted the polarization by approximately 50 % compared to pumping a single ground state. The total decay asymmetry of 0.06 and beam intensity were sufficient to provide a useful spin-1/2 beam for future BNMR experiments. A variant of the method was used previously to optically pump the full Doppler-broadened absorption profile of a beam of 11 Be + with a single-frequency light source.
ISSN:0304-3843
1572-9540
DOI:10.1007/s10751-016-1372-8