Tilted foil polarization of radioactive ions

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 1995-07, Vol.361 (1), p.53-59
• Main Authors: Lindroos, M, Broude, C, Goldring, G, Haas, H, Hass, M, Richards, P, Weissman, L
• Format: Article
• Language: English
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/0168-9002(95)00186-7

The tilted foil polarization technique has been applied to a beam of radioactive 23Mg ( I = 3 2 , T 1 2 = 11.35 s ) ions from ISOLDE. To achieve sufficient energy for penetration of the foils a high voltage platform has been constructed and used for acceleration of the initial 120 keV beam of 2 + 23Mg ions to 480 keV. The resulting asymmetry ϵ of the emitted β-radiation from the 23Mg implanted into a cold Pt stopper has been measured as a function of a holding magnetic field. At B = 0.09 T a value of ϵ = −7.4(1) × 10 −3 was found. The asymmetry was reduced to ϵ = −3.3(4) × 10 −3 at a field below 0.005 T. It is argued that this hard core asymmetry occurs as a result of the internal interaction between the polarized nuclei and the defects created in the implantation process.