Production of Three ${\mathrm{He}}^4$ Nuclei by the Direct Interaction of ${\mathrm{Li}}^6$ with ${\mathrm{Li}}^6$

The production of three ${\mathrm{He}}^4$ nuclei directly, as well as via intermediate ${\mathrm{Be}}^8$ states, was observed for the reaction ${\mathrm{Li}}^6$ + ${\mathrm{Li}}^6$ at bombarding energies between 2.0 and 13.0 MeV. The large peaks attributed to direct effects in the energy spectra were fitted using a simple model which assumed an $\alpha +d$ cluster structure for the ${\mathrm{Li}}^6$ nuclei and an interaction potential acting only between the deuterons.