LAUSR

In the paper we present the results obtained for the effect of rotation (ROT) in the angular distribution of prompt $\ensuremath{\gamma}$ rays from the fission of $^{235}\mathrm{U}$ induced by monochromatic polarized ``warm'' neutrons (${E}_{n}$ = 60 meV). The polarization vector direction is determined at the target position in order to correctly determine the sign of the measured effect. The asymmetry parameter was found to be equal to ${R}_{\ensuremath{\gamma}}=\ensuremath{-}(17.3\ifmmode\pm\else\textpm\fi{}2.8)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$. Moreover, the rotation angle of the fission axis was determined to be equal to $0.{069}^{\ensuremath{\circ}}\ifmmode\pm\else\textpm\fi{}0.{008}^{\ensuremath{\circ}}$ taking into account the fit results of the angular distribution of the prompt fission $\ensuremath{\gamma}$ rays. The obtained value and sign of the ROT effect are consistent with the results of the ROT effect obtained for cold neutrons. We describe the experiment, methodology of sign determination, and implications of the results.