<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>β</mml:mi></mml:math>-Delayed Deuteron Emission from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>Li</mml:mi><mml:mprescripts/><mml:none/><mml:mn>11</mml:mn></mml:mmultiscripts></mml:math>: Decay of the Halo

The deuteron-emission channel in the $\ensuremath{\beta}$ decay of the halo nucleus $^{11}\mathrm{Li}$ was measured at the Isotope Separator and Accelerator facility at TRIUMF by implanting postaccelerated $^{11}\mathrm{Li}$ ions into a segmented silicon detector. The events of interest were identified by correlating the decays of $^{11}\mathrm{Li}$ with those of the daughter nuclei. This method allowed the energy spectrum of the emitted deuterons to be extracted, free from contributions from other channels, and a precise value for the branching ratio ${B}_{d}=1.30(13)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ to be deduced for ${E}_{\mathrm{c}.\mathrm{m}.}&gt;200\text{ }\text{ }\mathrm{keV}$. The results provide the first unambiguous experimental evidence that the decay takes place essentially in the halo of $^{11}\mathrm{Li}$ and that it proceeds mainly to the $^{9}\mathrm{Li}+d$ continuum, opening up a new means to study the halo wave function of $^{11}\mathrm{Li}$.

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