Microscopic description of the beta delayed deuteron emission from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>6</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow></mml:math>

The beta delayed deuteron emission from $^{6}\mathrm{He}$ is studied in a dynamical microscopic cluster model. This model gives a reasonably good description for all the subsystems of $^{6}\mathrm{He}$ and $^{6}\mathrm{Li}$ in a coherent way, without any free parameter. The beta decay transition probability to the $^{6}\mathrm{Li}$ ground state is underestimated by a few percent. The theoretical beta delayed deuteron spectrum is close to experiment but it is also underestimated, by about a factor of 1.7. We argue that, in spite of their different magnitudes, both underestimations might have a common origin. The model confirms that the neutron halo part of the $^{6}\mathrm{He}$ wave function plays a crucial role in quenching the beta decay toward the \ensuremath{\alpha}+d channel.

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