Radiative Capture of ${}^{3}{He}$ by ${}^{3}{He}$

The reaction

{}^{3}{He} + {}^{3}{He} \to {}^{6}{Be}^{*} + γ

was observed at 90° for bombarding energies between 0.86 and 11.8 MeV. The total cross section for transitions to the first excited state of

{}^{6}{Be}

varies smoothly from 0.4 to 9.3 μb (assuming isotropy). No

γ

-ray transitions to the ground state of

{}^{6}{Be}

were observed with an upper limit of approximately

10^{- 2}

μb at 1.4 MeV. Because of these low cross sections, this reaction is of negligible astrophysical importance compared to the

{}^{3}{He} ({}^{3}{He}, 2 p) {}^{4}{He}

reaction.

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Radiative Capture ofHe3byHe3