Angular correlation of neutrons from thermal-neutron fission of 235U

Event-by-event study of neutron observables in spontaneous and thermal fission

“…[33,[36][37][38] and references therein) but which cannot be addressed with the standard models of fission. fission.…”

Neutron angular correlations in spontaneous and neutron-induced fission

“…Therefore we do not reproduce them again here but rather refer the reader to their work. We also compare to the 235 U(n th ,f) data of Franklyn et al [14]. In Sec.…”

“…It simulates the entire fission process and produces complete fission events with full kinematic information on the emerging fission products and the emitted neutrons and photons, incorporating sequential neutron and photon evaporation from the fission fragments. The event-by-event nature of FREYA makes it straightforward to extract the angular correlation between two evaporated neutrons [1,7,[14][15][16] and between an evaporated neutron and the light fission fragment [2], neither of which can be addressed with standard fission models.…”

“…They obtained correlation results for minimum neutron energies of 1.0, 1.75 and 2.5 MeV. The lower limit on the neutron kinetic energy was imposed by the pulse-shape discriminator [14].…”

“…In 1978 Franklyn, Hofmeyer and Mingay [14] studied neutron-neutron angular correlations in 235 U(n th ,f). They used two stilbene neutron detectors and employed pulse-shape discrimination to reject photon events.…”