Fission channel analysis for 232Th(n, f)

Angular distributions of fission fragments produced in the 232Th(n, f) reaction have been measured in 40-keV intervals. A simplified reaction model was adopted, and a channel analysis doneor 0.72 ≤ En (MeV) ≤ 4.5 MeV. An anomaly at En = 2.98 MeV suggests that K remains a good quantum number some 2 MeV above the fission threshold. The percentage contribution to the cross section of K = 3/2 states for incident neutron energies between 1.1 and 1.3 MeV is larger than previously thought.