The 9Be(d, γ0)11B reaction in the region of the giant dipole resonance

The 90° yield of the 9Be(d, γ0)11B reaction has been measured at deuteron energies ranging from 2.86 to 11.92 MeV in steps of 250 keV. Angular distributions have been obtained at Ed = 2.96, 6.87, 8.89 and 9.65 MeV. The γ-rays have been detected with a 23 cm × 23 cm NaI(Tl) crystal spectrometer enclosed in a plastic-scintillator anticoincidence shield. Evidence of structure has been observed in the excitation curve at Ed ≈ 3.4 and 9.65 MeV corresponding to excitation energies Eexc = 18.6 and 23.7 MeV, respectively. The angular distributions are typical of E1 transitions with a maximum at θL ≈ 90°. A calculation of the differential cross section of the inverse reaction, considered as a one-step direct process, gives results incompatible with the experiment and suggests that the 9Be(d,γ0)11B reaction proceeds through excitation of the T = 12 component of the giant dipole resonance in 11B.