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Beam quality: The beam current was limited to about 15-30 nA, depending on bombarding energy. Target: In first run targets of metallic lithium were produced by evaporating 6Li (95% enrichment) onto carbon backings. Thin targets of typically 27 μg/cm26Li on carbon backings of 10 μg/cm2 were used. In second run target of mixed composition of 7Li (22.5 μg/cm2) and 6Li (40 μg/cm2) on carbon backings of 20 μg/cm2. Data obtained: author graph (digitized with GSYS 2.4)First experiment (Elab = 5-17 MeV) was carried out at the Dynamitron-Tandem Laboratorium at Ruhr-Universitat Bochum. Second experiment (Elab = 20-40 MeV) was carried out at the 10 MV Van de Graaff Tandem at the Koln Tandem.