Structure of Unstable Nuclei with Polarized Radioactive Ion Beams Wooyoung Kim A.Gladkov, Y.K. Sun V. Kavtanyuk Nov. 12 th, 2013 J.W. Kim, C.C. Yun

Raon Polarization Facility Separator

Spin Orientation of Rank 1 and 2 Random spin orientationPolarizationProlate AlignmentOblate Alignment Polarization is analyzed by beta-NMR technique Alignment is analyzed by TDPAD method (gamma-rays detection)

AIP Conf. Proc. 980, 283 (2008) The Mechanism of spin-polarized RI beam via PF reaction

AIP Conf. Proc. 980, 283 (2008) In the rest flame of the projectile The Longitudinal Momentum Distribution The Transverse Momentum Distribution Near-side trajectory dominance Far-side trajectory dominance Polarization in the PF Reaction

Two-step PF +Momentum Dispersion Matching

Comments requests: Any requirements on 2 nd target placement? Such as shielding, long space, detector locations and so on. Current Configuration under Study and Beam Line Design from the Linac-End to the Target

Target Thickness Dependence of Polarization Target Primary beamSecondary beam Thick  Need to find a compromise! Primary beamSecondary beam Target Thin Thin TargetThick Target HighPolarization preservationLow NoSecondary reactionsYes LowMomentum spreadHigh LowProduction rateHigh

Principle of Polarization RI beams with Optical Pumping Optical pumping on the D1 transition of the alkali metal - 8 Li Nuclear spin I = 2, Total electronic angular momentum J = ± 1/2 Zeeman splitting in a weak magnetic field Total angular momentum F= I + J Absorption from F -> F’ of circularly polarized light σ + allows Δm F = +1 transition Fluorescence Δm F = -1,0,+1 Maximum electronic and nuclear polarization on the sublevel Δm F = 5/2

Low Energy Polarized RI Beams with Optical Pumping atomstargetionizercoolerlaserions rf spin rotanal P. Delheij, 2011 KoRIA Symposium with cooler Scheme : neutralize pump ionize again Polarization 80% with Li/sec. TRIUMF

Experimental Setup for Optical Pumping and β-NMR at CERN Reference 5.

Ge detectors at TRIUMF

Nuclear Moments with Optical Pumping Method B(E2) of Neutron-rich Mg IsotopeDecay Mode of Neutron-rich Isotope Na Isotope AsymmetryMeasurements in beta Decay 28 Na Decay Mode

ElementsPolarizing wavelength ≈(nm) Polarization ≈(%) Place Alkali metals 8 Li671, 673*80TRIUMF 9 Li671, 673*56 TRIUMF 11 Li671, 673*55TRIUMF 20 Na59057TRIUMF 21 Na59056TRIUMF 26 Na59055 TRIUMF 27 Na59051TRIUMF 28 Na59045TRIUMF 29 Na59050 TRIUMF 30 Na59050TRIUMF 31 Na59050TRIUMF 39 K K K Rb Rb Cs894CERN 221 Fr817CERN 223 Fr817CERN

ElementsPolarizing wavelength ≈(nm) Repump Wavelength ≈(nm) Polari zation ≈(%) Place Alkaline earths 11 Be313noneTRIUMF 27 Mg280none CERN 29 Mg280none40CERN 31 Mg280noneCERN Ca397866CERN Sr CERN Ba494650CERN Ra CERN

Reaction Beam Type Beam Energy [MeV/n] Detector/ Facility In-Flight Fragmentation Polarized Beam Expts (Projectile Fragmentation) Nuclear Moments 84 K, 43,44 Sc 200 TDPAD Nuclear Moments 41,39,37,36 S 200 TDPAD Nuclear Moments 123,125,126,127 Sn 200 TDPAD ISOL Polarized Beams (Optical Pumping) Nuclear Moments 8,9,11 Li, 20,21,26-28 Na Laser, beta NMR Nuclear Moments 28 Na 0.05 Laser, Ge Detector Nuclear Moments 27,29,31 Mg, 11 Be 0.06 Laser, beta NMR Nuclear Structure Study with Polarization