Microscopic description of the beta delayed deuteron emission from 6He

The beta delayed deuteron emission from 6He is studied in a dynamical microscopic cluster model. This model gives a reasonably good description for all the subsystems of 6He and 6Li in a coherent way, without any free parameter. The beta decay transition probability to the 6Li 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 6He wave function plays a crucial role in quenching the beta decay toward the α+d channel