Why prompt neutron gets less share of energy (fission)

[Magnetic Boy]

why neutron get so little energy in fission reaction as compare to fission fragments?
according to formula
E_m=E_f(M)/(m+M)
m=mass of small fragment
M= mass of relatively big fragment
E_f=fission energy
by the same logic neutron should get highest share due to their lower mass. i am missing something please point out. thanks

 

[mfb]

That formula only works for decays to two particles. Fission splits the nucleus in two (rarely three) parts, those parts then emit neutrons. The decay energies of those processes are a few MeV - the energy of the prompt neutrons (to a good approximation).

 

[Magnetic Boy]

That formula only works for decays to two particles. Fission splits the nucleus in two (rarely three) parts, those parts then emit neutrons. The decay energies of those processes are a few MeV - the energy of the prompt neutrons (to a good approximation).

are neutrons emit with fission simulatneously?

 

[mfb]

Some are clearly emitted later, for some the question becomes ambiguous - how long do you consider neutrons part of a nucleus, and when exactly is the fission process done? You don't have classical objects moving around.