Fission neutron classification

[Neutroniclad]

"Looking at time behaviour of neutrons in a reactor on time scales of both ~sec and ~days/months
Start with fission process
e.g. 235U + n -> 236U ->fission
Usually divide into 2 Fission Fragments
10%-20% of fission emit a scission neutron
(i.e. at time of scission)"

I've heard about prompt neutrons and delay neutrons, but what is scission neutrons?
By means of scission I think it's prompt neutrons, but I don't think the yield of prompt neutrons is that low.
Does anyone know any thing about scission neutrons?

 

[mfb]

According to Similarities between calculated scission-neutron properties and experimental data on prompt fission neutrons, scission neutrons are a subset of prompt neutrons. Prompt neutrons can be emitted directly in the fission process, or by one of the nuclear products quickly afterwards. Those two different cases lead to a different energy and angular emission spectrum.