Dynamic nuclear polarization of 19F in LaF3 nanoparticles dispersed in an ethanol matrix containing a polarizing agent for polarized target applications

• Published in: Progress of theoretical and experimental physics Vol. 2019; no. 3
• Main Authors: Miura, D, Iwata, T, Kaneko, D, Miyachi, Y, Nukazuka, G, Wauke, H
• Format: Journal Article
• Language: English
• Published: Oxford University Press 01-03-2019
• Subjects: D50
• ISSN: 2050-3911; 2050-3911
• DOI: 10.1093/ptep/ptz011

Abstract
The polarization enhancement of $\rm ^{19}F$ in $\rm LaF_{3}$ nanoparticles by dynamic nuclear polarization was investigated. A sample was prepared with nanoparticles that were produced by mechanical milling and dispersed in an ethanol matrix containing a free radical, 2,2,6,6,-Tetramethyl-1-piperidinyloxy. At a magnetic field of 2.5 T and temperature of 0.9 K, $\rm ^{19}F$ polarizations of $2.9\%$ and $-3.0\%$ were achieved. The observed polarizations are about 2/3 as high as those for $\rm ^{1}H$ in ethanol. This method can be applied for polarizing various nuclei in other materials, thus allowing a wide range of applications for polarized nuclear targets.