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Secondary neutrons as the main source of neutron-rich fission products in the bombardment of a thick U target by 1 GeV protons

Abstract : The diffusion-effusion model has been used to analyse the release and yields of Fr and Cs isotopes from uranium carbide targets of very different thicknesses (6.3 and 148 g/cm2) bombarded by a 1 GeV proton beam. Release curves of several isotopes of the same element and production efficiency versus decay half-life are well fitted with the same set of parameters. Comparison of efficiencies for neutron-rich and neutron-deficient Cs isotopes enables separation of the contributions from the primary (p+238U) and secondary (n + 238U) reactions to the production of neutron-rich Cs isotopes. A rather simple calculation of the neutron contribution describes these data fairly well. The FLUKA code describes the primary and secondary-reaction contributions to the Cs isotopes production efficiencies for different targets quite well.
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http://hal.in2p3.fr/in2p3-00605320
Contributor : Michel Lion <>
Submitted on : Friday, July 1, 2011 - 10:48:17 AM
Last modification on : Thursday, February 1, 2018 - 1:36:04 AM

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A.E. Barzakh, G. Lhersonneau, L.Kh. Batist, D.V. Fedorov, V.S. Ivanov, et al.. Secondary neutrons as the main source of neutron-rich fission products in the bombardment of a thick U target by 1 GeV protons. European Physical Journal A, EDP Sciences, 2011, 47, pp.70-79. ⟨10.1140/epja/i2011-11070-y⟩. ⟨in2p3-00605320⟩

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