Spin-oriented RI beams at RIBF and their applications (UENO Hideki)

by Dr UENO Hideki (RNC)

Tuesday 11 Jun 2013, 13:30 → 14:30 Asia/Tokyo

RIBF Hall (RIKEN Wako)

The method producing heavy-ion induced spin-orientated radioactive-isotope beams (RIBs) has progressed since it was first introduced at RIKEN 40 years ago. Spin-polarized RI beams, produced efficiently with RIPS, were utilized to determine electromagnetic nuclear moments of unstable nuclei. The method has been further developed taking advantage of the two-step fragmentation reaction and momentum dispersion-matching technique. Owing to this development, spin-aligned RIBs have become available with BigRIPS which provides RIBs at the world's highest intensities. As another application, the β-decay scheme of 17B was investigated through the measurement of β-delayed neutrons and γ rays, where β-ray detected NMR technique was combined to the β-delayed particle spectroscopy. This new scheme allows us to determine the spin parity of β-decay feeding excited states based on the difference in the discrete beta-decay asymmetry parameters, provided the states are connected through the Gamow-Teller transition. Details of this measurement will be presented after the method of spin-oriented RIBs and recent nuclear-moment measurements are mentioned. * The talk will be given in English.

Poster 20130611RIBFsemiPoster-165.pdf