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Beam quality: Beam energy resolution was 0.7 MeV. Target: Enriched 11B targets (98.6 %) of 0.26 and 0.53 g/cm2 thickness were used. Data obtained: author graph (digitized with GSYS 2.4)Experiment was performed at Institut de Physique Nucleaire, Orsay, France. Angular resolution was within 1.5 deg.