Details

Autor(en) / Beteiligte

• 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.

Titel

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

Ist Teil von

• Hyperfine interactions, 2016, Vol.237 (1), p.1-7, Article 162

Ort / Verlag

Cham: Springer International Publishing

Erscheinungsjahr

2016

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.