1. 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
・ 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

2. 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