2019 Impact factor 2.176
Hadrons and Nuclei


Eur. Phys. J. A 12, 317-325 (2001)

Complete and incomplete fusion in reactions of $\chem{^{7}Li}$ + $\chem{^{56}Fe}$ at $\chem{E(^{7}Li)=50}$ and 68 MeV from analysis of recoil range and light-particle measurements

R.I. Badran1, D.J. Parker2 and I.M. Naqib3

1  Physics Department, The Hashemite University, P.O. Box 150459, Zarqa, Jordan
2  School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, UK
3  12 Fogwell Road, Oxford OX2 9SA, UK

rbadran_i@yahoo.com

(Received: 29 March 2001 / Revised version: 28 August 2001 Communicated by J. Äystö)

Abstract
Excitation functions for the production of eight radioactive products of the reactions of $\chem{^{7}Li}$ on $\chem{^{56}Fe}$ have been measured up to $E(^{7}{\rm Li})=89$ 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 $\alpha $, 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 $\chem{^{56}Fe}$( $\chem{^{7}Li}$, $\alpha $) $\chem{^{59}Co^\ast}$. A parallel study on $\chem{^{55}Mn}$ shows some evidences of the ( $\chem{^{7}Li}$,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 ( $\chem{^{7}Li}$, $\alpha $) transfer process reproduces the observed break-up $\alpha $ spectra with some success.

PACS
25.70.-z - Low and intermediate energy heavy-ion reactions.
25.70.Jj - Fusion and fusion-fission reactions.
25.70.Hi - Transfer reactions.

© Società Italiana di Fisica, Springer-Verlag 2001