Abstract
Finely dispersed carbonizate powders were studied with the aim of revealing their suitability for producing hyperpolarized noble gases. In the temperature and frequency dependences obtained over a wide range of temperatures and magnetic fields for the spin-lattice relaxation times of the magnetic moments of 3He, 1H, and 13C nuclei, anomalous features caused by the suppression of the exchange between surface paramagnetic centers in a magnetic field were observed. It is shown that the interaction with magnetic moments of the 1H nuclei situated near the paramagnetic centers is the main polarization-leakage channel for the noble-gas nuclear spins.
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Translated from Pis’ma v Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 79, No. 12, 2004, pp. 778–782.
Original Russian Text Copyright © 2004 by Mamin, Haruhiko Suzuki, Tagirov, Tayurskii, Yudin.
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Mamin, G.V., Suzuki, H., Tagirov, M.S. et al. Nuclear spin-lattice relaxation in finely dispersed carbonizate powders. Jetp Lett. 79, 641–645 (2004). https://doi.org/10.1134/1.1790023
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DOI: https://doi.org/10.1134/1.1790023