Acoustic relaxation of Csl single crystals was studied in the temperature range 2 to 20K at frequencies of about (l-7)105Hz. The previously detected absorption peak caused by plastic deformation and localized in the temperature range 3 to 5K was studied in detail. A new relaxation peak was detected in the temperature range 8 to 10 K, which corresponds to a thermally activated process with activation energy U≈(6.1-8.9)·10~(-3) eV and attempt frequency v_0≈2·10~9-8·10~(10) s~(-1).
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