Effect Of Rotation In The Gamma-Ray Emission From 60 Mev Polarized Neutron-Induced Fission Of The U-235 Isotope

In the paper we present the results obtained for the effect of rotation (ROT) in the angular distribution of prompt gamma rays from the fission of U-235 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-gamma = -(17.3 +/- 2.8) x 10(-5). Moreover, the rotation angle of the fission axis was determined to be equal to 0.069 degrees +/- 0.008 degrees taking into account the fit results of the angular distribution of the prompt fission 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.