Abstract
The 11 B( 7 Li, 7 Be) 11 Be reaction at 57 MeV incident energy was studied at forward angles in order to explore the 11 Be excitation energy spectrum. The 11 Be ground state and the states at E ∗ =0.32,1.77,2.67,3.41,3.89,3.96,6.05 MeV excitation energies were populated. The state at 6.05 MeV (FWHM 320±40 keV) has not been previously observed. The good energy resolution (∼50 keV) allowed the identification of these transitions each for 7 Be in its ground and first excited state at E ∗ =0.429 MeV. QRPA calculations reproduce the 11 Be level structure below 2 MeV of excitation energy. The strength observed at higher excitation energies is very likely produced mainly by core-excited components of 11 Be.
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