In this articie we describe the method and results of measurement of
for U
235 fission neutrons slowed down by water to energies of 1.46 ev. The value obtained for
1.46 ev = 294 ± 1.5 cm
2
In conclusion, the authors express their sincere gratitude to I. I. Gurevich and D. V. Timoshuk for reviewing the results, to A. P. Venediktov for help in the work, and to G. R. Golbek for lending the 
-apparatus with low background.