Abstract
The degree of freedom of spin in quantum systems serves as an unparalleled laboratory where intriguing quantum physical properties such as asymmetry or magnetic property can be observed, and the enhanced control of spin may progress physics researches. We developed a novel method for controlling spin in a system of rare-isotope beams, the two-step fragmentation method with the momentum-dispersion matching technique. The present method was demonstrated in an experiment at the RIKEN RI Beam Factory, in which a degree of alignment of 8% was achieved for the spin of a rare isotope ^<32>Al. The figure of merit for the present method was found to be greater than that of the conventional method by a factor of more than 50.
