Fission cross-sections of 235U and 239Pu averaged over 252Cf neutron spectrum

THE EMISSION OF K-X-RAYS IN SLOW NEUTRON FISSION OF 233U, 235U, AND 239pu*

Present techniques admit the possibility of studying the character of fission fragments with spectroscopic identification of pairs of fragments. The simultaneous measurement of the masses and atomic numbers of fission fragments has been demonstrated in studies of the fission of 252Cf (1). The atomic number is determined by detection of a characteristic x-ray, most often a K-x-ray, emitted by on...

Monte Carlo Hauser - Feshbach predictions of prompt fission γ rays : Application to n th + 235 U , n th + 239 Pu , and 252 Cf ( sf )

The prompt neutron and γ emission from primary fission fragments are calculated for thermal neutron induced fission of 235U and 239Pu and for spontaneous fission of 252Cf using a Monte Carlo Hauser-Feshbach approach for the evaporation of the excited fission fragments. Remaining free model parameters, such as excitation energy sharing and initial spin distribution, are determined by comparison ...

Event-by-event evaluation of the prompt fission neutron spectrum from 239Pu(n, f)

Uncertainty Quantification for Applications of 239Pu Fission Cross Sections Using a Monte Carlo Technique

We present an approach to uncertainty quantification for nuclear applications, which combines the covariance evaluation of differential cross-sections data and the error propagation from matching a criticality experiment using a neutron-transport calculation. We have studied the reduction in uncertainty of Pu fission cross sections by using a one-dimensional neutron-transport calculation with t...

Towards high accurate neutron-induced fission cross sections of 240,242Pu: Spontaneous fission half-lives

Fast spectrum neutron-induced fission cross sections of transuranic isotopes are being of special demand in order to provide accurate data for the new GEN-IV nuclear power plants. To minimize the uncertainties on these measurements accurate data on spontaneous fission half-lives and detector efficiencies are a key point. High -active actinides need special attention since the misinterpretation ...