Abstract
Electromagnetic transition rates provide an important test for nuclear structure models. The nucleus $^{8}\mathrm{Be}$ exhibits a pronounced alpha-cluster structure and is a building block for more complex cluster nuclei. Here we report on the first observation of the gamma transition between the ${4}^{+}$ and ${2}^{+}$ states of $^{8}\mathrm{Be}$ in the $^{4}\mathrm{He}+^{4}\mathrm{He}$ reaction. The measured on-resonance cross section of $165\ifmmode\pm\else\textpm\fi{}54\text{ }\text{ }\mathrm{nb}$ leads to a $B(E2)$ of$25\ifmmode\pm\else\textpm\fi{}8{e}^{2}\text{ }\text{ }\mathrm{f}{\mathrm{m}}^{4}$, in good agreement with alpha-cluster models and sophisticated ab initio structure calculations.
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