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Showing papers by "Simon Henry Connell published in 2003"

Journal Article•DOI•
Emission of intermediate-mass fragments in the interaction of 16 O with 59 Co, 93 Nb and 197 Au

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E. Gadioli1, G.F. Steyn, Francesca Albertini1, Claudio Birattari1, M. Cavinato1, Simon Henry Connell2, A. A. Cowley3, E. Fabrici1, S. V. Förtsch, E. Gadioli Erba1, J. J. Lawrie, M. Pigni1, J.P.F. Sellschop2, E. Sideras Haddad2 •
University of Milan1, University of the Witwatersrand2, Stellenbosch University3
01 Jun 2003-European Physical Journal A
TL;DR: In this article, the emission of 8Begs, B and N fragments in the interaction of 16O ions with 59Co, 93Nb and 197Au at incident energies varying from 6 to 25 MeV/nucleon was studied.
Abstract: In this paper we study the emission of 8Begs, B and N fragments in the interaction of 16O ions with 59Co, 93Nb and 197Au at incident energies varying from 6 to 25 MeV/nucleon. The spectra of these fragments, as well as those of C fragments studied in a previous paper, are dominated at forward angles by a component originating from break-up of 16O. At the higher incident energies break-up occurs after quite a sizeable projectile energy loss. Another mechanism which dominates at large emission angles, favours the emission of low-energy fragments and is attributed to the coalescence of nucleons during the cascade of nucleon-nucleon interactions by means of which the excited nuclei produced in the primary two-ion interaction thermalize.

11 citations

Journal Article•DOI•
Isobaric yields and radiochemistry of near-target residues in the interaction of 12C and 16O with 103Rh at an incident energy of 400 MeV

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E. Z. Buthelezi, K. Aardaneh, G.F. Steyn, E. Gadioli1, T.N. van der Walt, Francesca Albertini1, F. Cerutti1, Simon Henry Connell2, A. A. Cowley3, Francois M. Nortier4 •
University of Milan1, University of the Witwatersrand2, Stellenbosch University3, Los Alamos National Laboratory4
01 Dec 2003-Journal of Radioanalytical and Nuclear Chemistry
TL;DR: In this article, an ion exchange method has been developed for the separation of Rh, Pd and Ag nuclides from all other produced activities, and the results are consistent with an enhanced isobaric yield in the near-target mass region.
Abstract: Production cross sections of residues with mass near to that of the target were measured in 12C and 16O induced reactions on Rh at an incident energy of 400 MeV. An ion-exchange method has been developed for the separation of Rh, Pd and Ag nuclides from all other produced activities. Rh and Ag nuclides were separated from elements such as Pd, Ru, and Tc, amongst others, on an AG1-X8 anion exchange resin in 6M HCl. The Ag nuclides were then removed from the effluent using a precipitation technique so that only Rh remained in the final solution. The Pd was afterwards separated from Ru and Tc by eluting it from the resin with 5% ammonia solution. This procedure made it possible to accurately measure production cross sections for 103mRh and 103Pd. Cross sections for the production of various other observed residues are also presented. The results are consistent with an enhanced isobaric yield in the near-target mass region. The radiochemical separation technique is also suitable for the routine production of Pd and Rh nuclides, e.g., 103Pd and 101mRh, in proton-induced reactions on Rh targets

2 citations