Beta-delayed deuteron emission from 11Li: decay of the halo
R. Raabe, A. Andreyev, M.J.G. Borge, L. Buchmann, P. Capel, H.O.U., Fynbo, M. Huyse, R. Kanungo, T. Kirchner, C. Mattoon, A.C. Morton, I. Mukha,, J. Pearson, J. Ponsaers, J.J. Ressler, K. Riisager, C. Ruiz, G. Ruprecht, F., Sarazin, O. Tengblad, P. Van Duppen, P. Walden
TL;DR
This study measures beta-delayed deuteron emission from 11Li, providing evidence that the decay occurs mainly in the halo region and offers insights into the halo wave function using a novel experimental approach.
Contribution
It presents the first unambiguous experimental evidence of halo decay in 11Li and introduces a method to study the halo wave function via deuteron emission.
Findings
Branching ratio B_d = 1.30(13) x 10^-4 for E(c.m.) > 200 keV
Decay occurs mainly to the 9Li + d continuum
Provides new insights into the halo structure of 11Li
Abstract
The deuteron-emission channel in the beta-decay of the halo-nucleus 11Li was measured at the ISAC facility at TRIUMF by implanting post-accelerated 11Li ions into a segmented silicon detector. The events of interest were identified by correlating the decays of 11Li 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) x 10-4 to be deduced for E(c.m.) > 200 keV. The results provide the first unambiguous experimental evidence that the decay takes place essentially in the halo of 11Li, and that it proceeds mainly to the 9Li + d continuum, opening up a new means to study of the halo wave function of 11Li.
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