VISCOSITY, FISSION TIME-SCALE AND DEFORMATION OF DY-156

In the fusion-fission reaction Ar-40 + Cd-116 --> Dy-156*, fission, at E-b = 216 MeV and 238 MeV, gamma-rays were measured in coincidence wi th fission fragments. The interpretation of the gamma-ray spectra is d one with the help of a modified version of the statistical-model code CASCADE. The spectra can be reproduced with nuclear viscosities in the range 0.01 < gamma < 4. The extracted fission time scale is of the or der of 10(-19) s. The CASCADE analysis seems to favor a prolate deform ation with beta approximate to 0.45. (C) 1998 Elsevier Science B.V.