Crystal blocking measurements of the time delay of fission induced by 32S, 48Ti, and 58Ni bombardment of W.
The time delay in fission induced by bombardment of W with 180 MeV 32S, 240-255 MeV 48Ti, and 315-375 MeV 58Ni has been measured by observation of crystal blocking. There is a clear narrowing and a small increase in the minimum yield of the angular dips for fission compared with scaled dips for elastically scattered ions. This is interpreted as a fission delay of about 2 as, only weakly dependent on energy and atomic number. The delay is longer by 1 to 2 orders of magnitude than obtained from standard interpretations of measurements of prescission neutrons and giant-dipole-resonance gamma rays and from calculations of the nuclear dynamics in heavy-ion reactions.
Andersen
J U
JU
Department of Physics, University of Aarhus, DK-8000 Aarhus C, Denmark. jua@phys.au.dk
Chevallier
J
J
Forster
J S
JS
Karamian
S A
SA
Vane
C R
CR
Beene
J R
JR
Galindo-Uribarri
A
A
del Campo
J Gomez
JG
Krause
H F
HF
Padilla-Rodal
E
E
Radford
D
D
Broude
C
C
Malaguti
F
F
Uguzzoni
A
A