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Water NMR for Polarized $^{129}$Xe Signal Calibration with a 283 G Magnetic Field
Vladimir Vladimirovich KAVTANYUK,Joshua Artem TAN,Wooyoung KIM,선용근,Seongwoo PARK,Jieun SO,Yu ANDO 한국물리학회 2016 New Physics: Sae Mulli Vol.66 No.5
We present measurements of water nuclear magnetic resonance (NMR) for polarized $^{129}$Xe signal calibration. We used a permanent magnet having an average homogeneous space in the center and a field of 283$\pm$2 G. A Pick-up coil was orthogonally inserted inside the RF coil. Oscillating RF and pick-up signals were managed by using Tecmag Apollo LF-1. Two LC circuits (the RF and the pick-up) were set to a resonance frequency of 1.205 MHz by manipulating a capacitance system. The nuclear spins of the protons in water are flipped and precess with the Larmor frequency around the direction of the static field. Tha application of an oscillating magnetic field with the Larmor frequency perpendicular to the static magnetic field leads to resonance absorption and emission of the electromagnetic energy. The emitted resonance signals are acquired by the pick-up coil and sent to the Apollo for analysis. In the future, the water NMR signal will be used for determining the polarization of $^{129}$Xe.
Production of Hyperpolarized 129Xe Using Spin Exchange Optical Pumping
Vladimir Vladimirovich KAVTANYUK,Wooyoung KIM,Yu ANDO,Sergey Chebotaryov,Yonggeun SEON,Joshua Artem TAN 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.10
We present a constructed setup for polarizing 129Xe noble gas. Hyperpolarized 129Xe has been obtained via spin exchange with an optically pumped rubidium vapor. Optical pumping is based on polarizing the valence electron of rubidium by the resonant absorption of a circularly polarized laser light. The magnetic field of 30 G was used for obtaining 129Xe polarization. The apparatus for detecting polarization is a nuclear magnetic resonance spectrometer. The highest 129Xe polarization of 54% has been obtained using 60 W circularly polarized laser light with wavelength of 794.7 nm. The measured longitudinal relaxation time of the hyperpolarized 129Xe was 72.3 minutes.