Neutron Emission in Fission
A model based on energy conservation with a detailed simulation of
the cascade neutron emission process from exited fragments was applied for
prompt neutron emission calculations. The results for the prompt neutron
multiplicity, nu(A), the neutron energy, Epsilon(A) , as a function of fission
fragment mass A and total kinetic energy (TKE), nu(TKE) are compared with
available experimental data for the spontaneous fission of 252Cf, 244,248Cm and
thermal neutron induced fission of 235U. Several problems connected with the
distribution of the available energy between exited fragments and the mechanisms
of neutron emission in fission are discussed. The high TKE range > 190MeV is
assumed as a possible region for scission neutron emission. In the framework of
this assumption, an excellent agreement between experimental and calculated data
for the TKE range from 150MeV to 205MeV (containing ~98% of all fission events)
within 1-2% was found for all spontaneously fissioning isotopes mentioned above.
An additional unfolding between the calculated results and the rather poor
experimental energy resolution improved the agreement also in case of
235U(nth,f). However, one may conclude that in spite of the good agreement
between the results of three experimental investigations for 235U(nth,f), they
maybe all have similar systematic uncertainties which result in a common
observation, namely a very low neutron multiplicity and a positive slope of
dnu/dE in the low TKE range (< 150MeV).
KORNILOV Nikolai;
HAMBSCH Franz-Josef;
VOROBYEV A.S.;
2007-09-26
ELSEVIER SCIENCE BV
JRC35289
0375-9474,
https://publications.jrc.ec.europa.eu/repository/handle/JRC35289,
10.1016/j.nuclphysa.2007.02.009,
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