PoS - Proceedings of Science
Volume 379 - The 18th International Workshop on Polarized Sources, Targets, and Polarimetry (PSTP2019) - Solid Polarized Targets
Polarized Lanthanum Target for the T-violation Search in Slow Neutron Transmission
K. Ishizaki,* H.M. Shimizu, M. Kitaguchi, T. Matsushita, M. Iinuma, H. Kohri, H. Yoshikawa, M. Yosoi, T. Shima, T. Iwata, Y. Miyachi, S. Ishimoto, M. Fujita, Y. Ikeda
*corresponding author
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Published on: September 23, 2020
Abstract
The $\mathrm{Nd}^{3+}$ doped $\mathrm{LaAlO}_3$ crystal is a good candidate of a polarized $^{139}\mathrm{La}$ target for the search of the P-odd and T-odd interaction in the low-energy neutron absorption of $^{139}\mathrm{La}$. As the first step for realizing the polarized $^{139}\mathrm{La}$ target, we grow the undoped $\mathrm{LaAlO}_3$ crystal and the $\mathrm{La}_{1-x}\mathrm{Nd}_x\mathrm{AlO}_3$ ($x=5 \times 10^{-4}$) crystal by floating-zone method with four halogen lamps. The ESR measurements of $\mathrm{Nd}^{3+}$ in the latter crystal indicated that the linewidth was about 6 gauss, whose value is the same as the crystal in which 50 % $^{139}\mathrm{La}$ polarization was achieved in the previous DNP experiment. As the result, the crystals grown by this method can be applicable to the target study for the T-violation search.
DOI: https://doi.org/10.22323/1.379.0061
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