title: Fragment kinetic energies and modes of fragment formation
abstract: Kinetic energies of light fragments ( A</=10) from the decay of target spectators in 197Au+197Au collisions at 1000 MeV per nucleon have been measured with high-resolution telescopes at backward angles. Except for protons and apart from the observed evaporation components, the kinetic-energy spectra exhibit slope temperatures of about 17 MeV, independent of the particle species, but not corresponding to the thermal or chemical degrees of freedom at breakup. It is suggested that these slope temperatures may reflect the intrinsic Fermi motion and thus the bulk density of the spectator system at the instant of becoming unstable.
authors.affiliation: Gesellschaft fur Schwerionenforschung, D-64291 Darmstadt, Germany.
authors.initials: T
authors.lastname: Odeh
authors.initials: R
authors.lastname: Bassini
authors.initials: M
authors.lastname: Begemann-Blaich
authors.initials: S
authors.lastname: Fritz
authors.initials: SJ
authors.lastname: Gaff-Ejakov
authors.initials: D
authors.lastname: Gourio
authors.initials: C
authors.lastname: Gross
authors.initials: G
authors.lastname: Imme
authors.initials: I
authors.lastname: Iori
authors.initials: U
authors.lastname: Kleinevoss
authors.initials: GJ
authors.lastname: Kunde
authors.initials: WD
authors.lastname: Kunze
authors.initials: U
authors.lastname: Lynen
authors.initials: V
authors.lastname: Maddalena
authors.initials: M
authors.lastname: Mahi
authors.initials: T
authors.lastname: Mohlenkamp
authors.initials: A
authors.lastname: Moroni
authors.initials: WF
authors.lastname: Muller
authors.initials: C
authors.lastname: Nociforo
authors.initials: B
authors.lastname: Ocker
authors.initials: F
authors.lastname: Petruzzelli
authors.initials: J
authors.lastname: Pochodzalla
authors.initials: G
authors.lastname: Raciti
authors.initials: G
authors.lastname: Riccobene
authors.initials: FP
authors.lastname: Romano
authors.initials: A
authors.lastname: Saija