C. M. Mattoon

β-delayed deuteron emission from Li11: decay of the halo

The deuteron-emission channel in the beta decay of the halo nucleus (11)Li was measured at the Isotope Separator and Accelerator facility at TRIUMF by implanting postaccelerated (11)Li ions into a segmented silicon detector. The events of interest were identified by correlating the decays of (11)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)x10(-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 (11)Li and that it proceeds mainly to the (9)Li+d continuum, opening up a new means to study the halo wave function of (11)Li.

β-delayed deuteron emission from 11Li: Decay of the halo

The deuteron-emission channel in the beta decay of the halo nucleus (11)Li was measured at the Isotope Separator and Accelerator facility at TRIUMF by implanting postaccelerated (11)Li ions into a segmented silicon detector. The events of interest were identified by correlating the decays of (11)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)x10(-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 (11)Li and that it proceeds mainly to the (9)Li+d continuum, opening up a new means to study the halo wave function of (11)Li.

Line-shape analysis of Doppler-broadened {gamma} lines following the {beta} decay of {sup 11}Li

The {beta} decay of {sup 11}Li is studied at the TRIUMF Isotope Separation and Acceleration (ISAC) facility using the 8{pi} {gamma}-ray spectrometer coupled with an inner array of 20 plastic scintillators for {beta} detection. Doppler-broadened line shapes resulting from the decay of the excited states in {sup 10}Be populated by {beta}-delayed one-neutron emission are analyzed using Monte Carlo simulations. New {beta}-delayed neutron decay branches are shown to contribute to the complex decay of {sup 11}Li. The half-lives of all but one bound excited state in {sup 10}Be are also deduced from this work. Among them, the half-life of the 2{sup -} state in {sup 10}Be is shown to be much shorter than previously thought, yielding a new experimental B(E1) now well within the range of theoretical predictions and providing further evidence that the 2{sup -} state in {sup 10}Be is an excited halo state. The nature of the 8.82-MeV state in {sup 11}Be and its decay paths to excited states in {sup 10}Be are found to be consistent with the {beta} decay of the core proceeding through this particular state.

β-Delayed Deuteron Emission fromLi11: Decay of the Halo

The deuteron-emission channel in the beta decay of the halo nucleus (11)Li was measured at the Isotope Separator and Accelerator facility at TRIUMF by implanting postaccelerated (11)Li ions into a segmented silicon detector. The events of interest were identified by correlating the decays of (11)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)x10(-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 (11)Li and that it proceeds mainly to the (9)Li+d continuum, opening up a new means to study the halo wave function of (11)Li.

Charged‐particle channels in the β‐decay of 11Li

We measured the {beta}-decay of the halo-nucleus {sup 11}Li, with particular attention to the deuteron- and triton-emission channels. We employed a post-accelerated beam of {sup 11}Li ions, and the implantation technique in a finely-segmented silicon detector. The channels of interest were identified through the time and space correlations between the implantation events and the parent and daughter decays. We obtained the branching ratios, as well as the spectra of the emitted ions.

Charged-particle channels in the bêta-decay of 11Li

We measured the {beta}-decay of the halo-nucleus {sup 11}Li, with particular attention to the deuteron- and triton-emission channels. We employed a post-accelerated beam of {sup 11}Li ions, and the implantation technique in a finely-segmented silicon detector. The channels of interest were identified through the time and space correlations between the implantation events and the parent and daughter decays. We obtained the branching ratios, as well as the spectra of the emitted ions.

Charged-particle channels in the {beta}-decay of {sup 11}Li

We measured the {beta}-decay of the halo-nucleus {sup 11}Li, with particular attention to the deuteron- and triton-emission channels. We employed a post-accelerated beam of {sup 11}Li ions, and the implantation technique in a finely-segmented silicon detector. The channels of interest were identified through the time and space correlations between the implantation events and the parent and daughter decays. We obtained the branching ratios, as well as the spectra of the emitted ions.