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 elas...

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Bibliographic Details
Published in:Physical review letters 2007-10, Vol.99 (16), p.162502-162502
Main 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
Format: Article
Language:English
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Summary: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.
ISSN:0031-9007