  The degree of freedom of spin in quantum systems serves as an unparalleled
laboratory where intriguing quantum physical properties can be observed, and
the ability to control spin is a powerful tool in physics research. We propose
a novel method for controlling spin in a system of rare isotopes which takes
advantage of the mechanism of the projectile fragmentation reaction combined
with the momentum-dispersion matching technique. The present method was
verified 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 Al-32. 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.
