Emission of intermediate-mass fragments in the interaction of with , andE. Gadioli1, G.F. Steyn2, F. Albertini1, C. Birattari1, M. Cavinato1, S.H. Connell3, A.A. Cowley4, E. Fabrici1, S.V. Förtsch2, E. Gadioli Erba1, J.J. Lawrie2, M. Pigni1, J.P.F. Sellschop3 and E. Sideras Haddad3
1 Università di Milano and I.N.F.N., Sezione di Milano, Milano, Italy
2 iThemba Laboratory for Accelerator-Based Sciences, Somerset West 7129, South Africa
3 Schonland Research Centre, Witwatersrand University, Johannesburg, South Africa
4 Department of Physics, University of Stellenbosch, Matieland 7602, South Africa
(Received: 21 January 2003 / Revised version: 10 March 2003 / Published online: 5 June 2003)
In this paper we study the emission of , B and N fragments in the interaction of ions with , and 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 . 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.
25.70.Gh - Compound nucleus.
25.70.Mn - Projectile and target fragmentation.
© Società Italiana di Fisica, Springer-Verlag 2003