Journal
NUCLEAR PHYSICS A
Volume 768, Issue 1-2, Pages 1-21Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nuclphysa.2006.01.006
Keywords
spallation reactions; isotopic production cross sections; accelerator-driven system; evaporation residues; multiple reactions in target; charge-pickup cross sections
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The production cross sections of fragmentation-evaporation residues in the reaction Pb + p at 500 A MeV have been measured using the inverse-kinematics method and the FRS spectrometer (GSI). Fragments were identified in nuclear charge using ionisation chambers. The mass identification was performed event-byevent using the Bp-TOF-Delta E technique. Although partially-unresolved ionic charge states induced an ambiguity on the mass of some heavy fragments, production rates could be obtained with a high accuracy by systematically accounting for the polluting ionic charge states. The contribution of multiple reactions in the target was subtracted using a new, partly self-consistent code. The isobaric distributions are found to have a shape very close to the one observed in experiments at higher energy. Kinematic properties of the fragments were also measured. The total and the isotopic cross sections, including charge-pickup Cross sections, are in good agreement with previous measurements and models. The data are discussed in the light of previous spallation measurements, especially on lead at 1 GeV.(c) 2006 Elsevier B.V. All rights reserved.
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