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Description
Title:Production of spin-controlled RI beams
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. Recently, we have proposed a novel method to produce
spin-controlled (aligned) RI beams, that is the two-step fragmentation
method with the momentum-dispersion matching technique [1]. The method
was verified in an experiment at the RIKEN RIBF, in which an RI beam of
Al-32 with a degree of alignment of 8% was produced from a primary beam
of Ca-48 via an intermidiate product of Al-33. The figure of merit for
the new method was found to be greater than that of the conventional
method by a factor of more than 50. Such an ability to control spin,
when applied to state-of-the-art RI beams, is expected to provide
unprecedented opportunities for research on the nuclear structure of
species situated outside the traditional region of the nuclear chart.
[1] Y. Ichikawa, H. Ueno et al., Nature Phys. 8 (2012) 918.
