P-parity nonconservation in the total cross section for the interaction of thermal neutrons with /sup 233/U

An upper limit is found on the difference between the cross sections for the interactions of thermal neutrons with opposite helicities with /sup 233/U: P = (sigma/sup +//sub t/-sigma/sup -//sub t/)/(sigma/sup +//sub t/ +sigma/sup -//sub t/)<1.5 x 10/sup -6/ (at a 90% confidence level). This result contradicts the value P = 10/sup -4/--10/sup -5/ estimated under the assumption that the 0.17-eV level is a p-wave level.