Crystal blocking measurements of the time delay of fission induced by 32S, 48Ti, and 58Ni bombardment of W |
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Authors: | Andersen J U Chevallier J Forster J S Karamian S A Vane C R Beene J R Galindo-Uribarri A del Campo J Gomez Krause H F Padilla-Rodal E Radford D Broude C Malaguti F Uguzzoni A |
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Institution: | Department of Physics, University of Aarhus, DK-8000 Aarhus C, Denmark. jua@phys.au.dk |
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Abstract: | 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. |
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