Possibilities to improve the fission fragment experiment with oriented nuclei

The original fission fragment directional distribution experiments with aligned 235 U and possible improvements for a new series of such experiments including the use of polarized neutrons and polarized nuclei are considered. The main goal of the experiments is to obtain more precise values of the anisotropy parameter and study its variation as a function of energy rather than at resonance energies. It is shown that better statistical accuracy can be obtained with higher neutron fluxes and larger detectors. Systematical errors can be much smaller notably by improved thermometry. Lower temperatures are very useful to increase the effects substantially, which might be useful to test the two-channel model. Finally orientation of 235 U by magnetic hyperfine interaction and use of polarized neutrons are of considerable interest. 19 refs., 2 figs