Very heavy fission fragments produced in the spallation reaction $^{238}$U+p at 1 A GeV

Abstract : Fission Fragments from 1 A GeV $^{238}$U ions impinging a hydrogen target were studied using the fragment separator FRS from GSI for magnetic selection including ray-tracing, and $\Delta$E-ToF techniques. From the kinematics of the fragments, binary fission can be assigned as production process up to very heavy fragments. Fission fragments were identified as far as $^{184}$Re for the first time. Cross sections are measured and found in the range of 500 $\mu$b to 5 $\mu$b. Isobaric cross sections decrease smoothly with increasing mass. Beyond tungsten, fission fragments are hidden in the more abundant spallation evaporation residues. Fission cross sections of 283 isotopes of Gd to Re in the mass range 147 to 184 were obtained. All fragments result from fission of excited parent nuclei and after emission of secondary neutrons
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M. Bernas, P. Armbruster, J. Benlliure, A. Boudard, E. Casarejos, et al.. Very heavy fission fragments produced in the spallation reaction $^{238}$U+p at 1 A GeV. Nuclear Physics A, Elsevier, 2006, 765, pp.197-210. ⟨10.1016/j.nuclphysa.2005.10.009⟩. ⟨in2p3-00024371⟩



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