Fragment Kinetic Energies and Modes of Fragment Formation

Details Fragment Kinetic Energies and Modes of Fragment Formation Fragment Kinetic Energies and Modes of Fragment Formation

2000-03-10

arxiv.org/abs/nucl-ex/0003005v1

Phys.Rev.Lett. 84 (2000) 4557

Physics

Nuclear Physics

Nuclear Experiment

11 pages, with 4 included figures; Accepted by Phys. Rev. Lett.; Also available from http://www-kp3.gsi.de/www/kp3/aladin_publ

Scientific paper

10.1103/PhysRevLett.84.4557

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. PACS numbers: 25.70.Pq, 21.65.+f, 25.70.Mn

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