Complete and incomplete fusion in reactions of 7Li + 56Fe at E(7Li) = 50 and 68 MeV from analysis of recoil range and light-particle measurements |
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Authors: | RI Badran DJ Parker IM Naqib |
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Institution: | (1) Physics Department, The Hashemite University, P.O. Box 150459, Zarqa, Jordan, JO;(2) School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, UK, GB;(3) 12 Fogwell Road, Oxford OX2 9SA, UK, GB |
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Abstract: | Excitation functions for the production of eight radioactive products of the reactions of 7Li on 56Fe have been measured up to E(7
Li) = 89 MeV. Recoil range distributions for these products, together with inclusive proton, deuteron, triton and alpha spectra,
have been measured at energies of 50 and 68 MeV. The α, t and d spectra show characteristic “break-up” components at forward
angles, while the recoil distributions show evidence of complete fusion and incomplete-fusion process 56Fe( 7Li,α) 59Co * . A parallel study on 55Mn shows some evidences of the ( 7Li,t) incomplete-fusion process, but the cross-section for this process is significantly less than for the triton fusion process.
The recoil distributions can be reproduced on the assumption that essentially all the observed break-up fragments are in fact
associated with incomplete fusion, but uncertainties in normalisation leave open the possibility of a significant contribution
of pure break-up. A diffraction model of the ( 7Li,α) transfer process reproduces the observed break-up α spectra with some success.
Received: 29 March 2001 / Accepted: 12 November 2001 |
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Keywords: | PACS 25 70 -z Low and intermediate energy heavy-ion reactions – 25 70 Jj Fusion and fusion-fission reactions – 25 70 Hi Transfer reactions |
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