Measurements of delayed-neutron yields from thermal-neutron-induced fission of 235U, 233U, 239Pu, and 237Np

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...

Nucleon pair breaking in the thermal neutron induced fission of 233U and 235U

2014 The absence of a systematic even-odd effect in the primary fragment mass distributions, which has been recently observed, is discussed in terms of nucleon pair breaking during the saddle to scission transition. It is concluded that the existing experimental data are compatible with the assumption of a process where at least one nucleon pair is broken. J. Physique 44 (1983) 785-790 JUILLET ...

Effects of Neutron Emission on Fragment Mass and Kinetic Energy Distribution from Thermal Neutron-Induced Fission of 235U

The mass and kinetic energy distribution of nuclear fragments from thermal neutroninduced fission of U(nth, f ) have been studied using a Monte-Carlo simulation. Besides reproducing the pronounced broadening in the standard deviation of the kinetic energy at the final fragment mass number around m = 109, our simulation also produces a second broadening around m = 125. These results are in good ...

Measurement of neutron induced fission of 235U, 233U and 245Cm with the FIC detector at the CERN n TOF facility

A series of measurements of neutron induced fission cross section of various TRU isotopes have been performed at the CERN n TOF spallation neutron facility, in the energy range from thermal to nearly 250MeV. The experimental apparatus consists in a fast ionization chamber (FIC), used as a fission fragment detector with a high efficiency. Good discrimination between alphas and fission fragments ...

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