Breakup of ${\mathrm{O}}^{16}$ into ${\mathrm{Be}}^8$+${\mathrm{Be}}^8$

The reaction ${\mathrm{C}}^{12}+\alpha \to {\mathrm{Be}}^8+{\mathrm{Be}}^8$ was studied in the range of $\alpha$ energy $11.85 \mathrm{MeV}\le E_{\alpha \mathrm{in}}\le 19.4 \mathrm{MeV}$. The ${\mathrm{Be}}^8$ nuclei were detected by a suitable counter system registering the $\alpha$-particle decay products. The cross section for this reaction was found to be quite large. A number of resonances were identified, and their spins and parities were determined by angular-distribution measurements. There is an indication of a rotational-band pattern of some of the levels.