MCM-41 is a unique mesoporous material with cylindrical-like pores that provide an ideal platform to study 1D properties of adsorbed atoms (Boninsegni and Moroni in J Low Temp Phys 118(1):1, 2000). In this research, we use pulsed NMR to measure the nuclear spin-lattice relaxation times (T1\documentclass[12pt]{minimal}
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\begin{document}$$T_1$$\end{document}) of 3\documentclass[12pt]{minimal}
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\begin{document}$$^3$$\end{document}He adsorbed onto 4\documentclass[12pt]{minimal}
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\begin{document}$$^4$$\end{document}He-preplated MCM-41 over a wide range of temperatures for a line density that would lead to a Fermi temperature of 200 mK. The temperature dependence of the nuclear spin-lattice relaxation time for 0.025<T<3.5\documentclass[12pt]{minimal}
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\begin{document}$$ 0.025<T< 3.5 $$\end{document} K exhibited a pronounced peak at 195 mK, qualitatively similar to that calculated for the spin relaxation of 1D Fermi systems.
