Abstract
Total interaction cross sections have been measured for8Li on C and Pb targets, for9Li on C, Al, Cu, Sn and Pb targets as well as for11Li on C, Sn and Pb targets. For each beam, we also used a plastic scintillator as target. The measurements with the scintillator targets are used to extract reduced nuclear radii of the lithium isotopes. These radii are then used for the calculation of the nuclear part of the total cross section for the other targets. The total electromagnetic-dissociation (EMD) cross sections have been deduced and are compared to different models. A strong target-charge-dependent EMD cross section is measured for11Li reaching 2.96 +0.84−0.82 b for the Pb target. In the9Li case, a large EMD cross section for high-Z targets has been observed which amounts to 0.75 ± 0.45 b for the Pb target. The EMD cross sections of both,9Li and11Li, may be understood by the giantdipole-resonance model.
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Dedicated to Prof. Dr. P. Armbruster on the occasion of his 60th birthday
This work forms part of the PhD Thesis of B. Blank
We would like to thank E. Hanelt, M. Pravikoff and B. Voss for preparing parts of the experimental equipment. We acknowledge the excellent work of H. Folger and the GSI target laboratory as well as of H.-J. Benz and the GSI mechanical workshop for pre-paring our targets and degraders with the necessary precision. We are indebted to the whole accelerator staff at SATURNE as well as to Y. Bedfer, J.-C. Duchazeau-Beneix, G. Milleret and J.-M. Soudan for their assistance during the experiment. We thank D.J. Vieira for carefully reading the manuscript. This work was supported by the BMFT under contract no. 06DA102I.
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Blank, B., Gaimard, J.J., Geissel, H. et al. Reaction cross section measurements of the neutron-rich isotopes8,9,11Li at 80 MeV/nucleon. Z. Physik A - Hadrons and Nuclei 340, 41–50 (1991). https://doi.org/10.1007/BF01284479
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DOI: https://doi.org/10.1007/BF01284479