Cross-sections of spallation residues produced in 1.A GeV 208Pb on proton reactions

Abstract

Spallation residues produced in 1 GeV per nucleon ${}^{208}$Pb on proton reactions have been studied using the FRagment Separator facility at GSI. Isotopic produc- tion cross-sections of elements from ${}_{61}$Pm to ${}_{82}$Pb have been measured down to 0.1 mb with a high accuracy. The recoil kinetic energies of the produced fragments were also determined. The obtained cross-sections agree with most of the few existing gamma-spectroscopy data. Data are compared with different intra nuclear-cascade and evaporation-fission models. Drastic deviations were found for a standard code used in technical applications.

arXiv comment4 pages, 3 figures, accepted for publication in Phys. Rev. Lett. Revised version May 12, 2000

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