The European Physical Journal A - Hadrons and Nuclei

, Volume 17, Issue 2, pp 195-212

First online:

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

  • E. GadioliAffiliated withUniversità di Milano and I.N.F.N., Sezione di Milano, Milano, Italy
  • , G.F. SteynAffiliated withiThemba Laboratory for Accelerator-Based Sciences, Somerset West 7129, South Africa
  • , F. AlbertiniAffiliated withUniversità di Milano and I.N.F.N., Sezione di Milano, Milano, Italy
  • , C. BirattariAffiliated withUniversità di Milano and I.N.F.N., Sezione di Milano, Milano, Italy
  • , M. CavinatoAffiliated withUniversità di Milano and I.N.F.N., Sezione di Milano, Milano, Italy
  • , S.H. ConnellAffiliated withSchonland Research Centre, Witwatersrand University, Johannesburg, South Africa
  • , A.A. CowleyAffiliated withDepartment of Physics, University of Stellenbosch, Matieland 7602, South Africa
  • , E. FabriciAffiliated withUniversità di Milano and I.N.F.N., Sezione di Milano, Milano, Italy
  • , S.V. FörtschAffiliated withiThemba Laboratory for Accelerator-Based Sciences, Somerset West 7129, South Africa
    • , E. Gadioli ErbaAffiliated withUniversità di Milano and I.N.F.N., Sezione di Milano, Milano, Italy
    • , J.J. LawrieAffiliated withiThemba Laboratory for Accelerator-Based Sciences, Somerset West 7129, South Africa
    • , M. PigniAffiliated withUniversità di Milano and I.N.F.N., Sezione di Milano, Milano, Italy
    • , J.P.F. SellschopAffiliated withSchonland Research Centre, Witwatersrand University, Johannesburg, South Africa
    • , E. Sideras HaddadAffiliated withSchonland Research Centre, Witwatersrand University, Johannesburg, South Africa

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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.

PACS. 25.70.Gh Compound nucleus – 25.70.Mn Projectile and target fragmentation