The (${}_{}{}^9{}_{}{}^{}\mathrm{Be}$, ${}_{}{}^8{}_{}{}^{}\mathrm{Be}$) reaction has been investigated at a bombarding energy of 50 MeV on targets of ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{26}{}_{}{}^{}\mathrm{Mg}$, ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$, ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$, and ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$. Owing to the small neutron binding energy of ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$ and the resulting positive $Q$ values, this reaction favors transitions involving small $l$ transfers and populates states up to several MeV in excitation with a fairly high yield. In addition, a broad continuum in the energy spectra was observed that can be attributed to the breakup of the weakly bound ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$ projectile. For the ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$, ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$, and ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$ targets, spectroscopic factors have been extracted from exact finite-range distorted-wave Born-approximation calculations using optical-model potentials derived from ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$ elastic-scattering data. The relative spectroscopic factors are in good agreement with those obtained from light-ion reactions but the absolute values are low.

NUCLEAR REACTIONS ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{26}{}_{}{}^{}\mathrm{Mg}$, ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$, ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$, ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$ (${}_{}{}^9{}_{}{}^{}\mathrm{Be}$, ${}_{}{}^8{}_{}{}^{}\mathrm{Be}$), ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$, ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$, ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$ (${}_{}{}^9{}_{}{}^{}\mathrm{Be}$, ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$), $E_{\mathrm{lab}}=50\mathrm{}$ MeV; measured $\sigma (E,\Theta )$ for ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$, ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$, ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$; optical model and EFR-DWBA analyses, deduced spectroscopic factors, ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$ breakup.

• Received 14 June 1977

DOI:https://doi.org/10.1103/PhysRevC.16.1456