Measurements of electromagnetic moments of 19N and 20N and spectroscopic studies of levels in daughter nucleus

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A versatile spin polarizer for radioactive nuclear beams is proposed for spectroscopic studies of exotic nuclei far from stability. The polarizer takes advantage of the polarized electron transfer process, as in the optically pumped polarized proton ion sources. This method is applicable for low energy beams with a wide variety of nuclear species. The feasibility of the polarizer has been experimentally investigated by using stable nuclear beams at the test stand of RCNP.The beams with 2+ charge were injected into the polarizer and the nuclear polarization of the 1+ charge ions was selectively measured. The polarization measurement was based on the method of beam-foil spectroscopy. The nuclear polarization was observed for 10 keV/amu 3He, 3.4 keV/amu 14N and 15N beams to be (3.89 +- 0.76) %, (3.04 +- 0.11) % and (1.32 +- 0.40) %, respectively with P (Rb) =70-80%. The transmission efficiency of the 14N beam, (2+ion → 1+ion) was found to be 〜 60%. The performance is very promising for practical applications.