Spin-Aligned RI Beams and g-Factor Measurements

A method to produce spin-aligned RI beams has been developed, where a scheme of two-step projectile fragmentation to produce the RI of interest with high spin alignment and a technique of momentum-dispersion matching are combined. The experiment employing the present method was carried out at the RIKEN RIBF, where an RI beam of ³²Al with spin alignment of 8(1)% was successfully produced from a primary beam of ⁴⁸Ca, via an intermediate RI of ³³Al. The g-factor of the isomeric state of ³²Al (^32mAl), thus produced and implanted in a stopper, was measured by means of the Time-Differential Perturbed Angular Distribution (TDPAD) method. The g-factor was determined to be g = 1.32(1). The figure of merit of the present method was found to be greater than that of a conventional one by a factor of more than 50. A future prospect of the nuclear moment measurements employing the present method is presented.