Heavy Ion Nuclear Physics Lab. Yukari MATSUO Novel nuclear laser spectroscopy of RI atoms in superfluid helium: OROCHI Heavy Ion Nuclear Physics Lab. Yukari MATSUO in collaboration with T. Furukawa, Y. Matsuura, T. Kobayashi, … T. Motobayashi RIKEN, Tokyo Tech., Tohoku CYRIC, Osaka U., TUAT Optical RI-atom Observation in Condensed Helium as Ion-catcher He stopper of RI beam Laser spectroscopy + ~eV ~10-5 – 10-8eV Ion beam (radioisotope atoms) separator Accelerator RI atoms target RF/ MW (((((( RI beam Laser LIF He II “Original” method to overcome all the difficulty in traditional nuclear laser spectroscopy ・ high trapping efficiency of He II (expected to be nearly 100 %) ・ background of stray light is reduced, by the order of 10-10 - 10-13 ・ no background from the other elements ・ observation of LIF photons repeatedly (typically 105 /s) potentially applicable to ~ 1 pps RI atoms ・ applicable to various elements other than alkali atoms For the systematic determination of nuclear spins and moments by measuring atomic Zeeman and hyperfine splittings

OROCHI near future & the other way of controlling atomic and nuclear spins Proton number Neutron number Z=50 magic number N=50 magic number Z=82 magic number moment unknown extending neutron number increased variety of atomic species Nuclear chart Au Rb Ag promising candidates for OROCHI Cs LHC RHC Generating spin-polarized ions using pulsed lasers an ion whose valence electron is spin-polarized in collaboration with Prof. T. Nakajima (Kyoto U.) Sr atom In Under development of optical pumping Laser is a powerful tool to investigate nuclear structures as well as to control spins by manipulating atomic energy levels