title: Crystal blocking measurements of the time delay of fission induced by 32S, 48Ti, and 58Ni bombardment of W.
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.
authors.affiliation: Department of Physics, University of Aarhus, DK-8000 Aarhus C, Denmark. jua@phys.au.dk
authors.forename: J U
authors.initials: JU
authors.lastname: Andersen
authors.forename: J
authors.initials: J
authors.lastname: Chevallier
authors.forename: J S
authors.initials: JS
authors.lastname: Forster
authors.forename: S A
authors.initials: SA
authors.lastname: Karamian
authors.forename: C R
authors.initials: CR
authors.lastname: Vane
authors.forename: J R
authors.initials: JR
authors.lastname: Beene
authors.forename: A
authors.initials: A
authors.lastname: Galindo-Uribarri
authors.forename: J Gomez
authors.initials: JG
authors.lastname: del Campo
authors.forename: H F
authors.initials: HF
authors.lastname: Krause
authors.forename: E
authors.initials: E
authors.lastname: Padilla-Rodal
authors.forename: D
authors.initials: D
authors.lastname: Radford
authors.forename: C
authors.initials: C
authors.lastname: Broude
authors.forename: F
authors.initials: F
authors.lastname: Malaguti
authors.forename: A
authors.initials: A
authors.lastname: Uguzzoni