Aa. Goverdovski et al., TEMPERATURE EFFECTS IN PRESCISSION-DEFORMATION SPECTRA OF NP-238 FISSION FRAGMENTS, Physics of atomic nuclei, 60(9), 1997, pp. 1441-1447
Measured mass and kinetic-energy distributions of fragments of Np-237
fission induced by 1- and 18-MeV neutrons are presented. It is shown t
hat the yield of mass-symmetric fragments increases sharply up to 1%.
The kinetic-energy spectra of fragments of different components are fo
und to vary in fundamentally different ways. The observed effects are
treated as manifestations of the influence exerted by nuclear temperat
ure on the shell structure of fission fragments.