Anomalous population of 10He states in reactions with 11Li
Abstract
Structure with the lowest energy observed in the 10He spectrum populated in the proton knockout reaction with 11Li beam has a peak at 1.2-1.5 MeV. This peak is usually interpreted as a resonant 0+ ground state of 10He. Our theoretical calculations indicate that this peak is likely to be a pileup of 1-, 0+, and 2+ excitations with very similar shapes. %We predict a very specific nature of the 1- excitation in 10He. Moreover, the ``soft'' 1- excitation appears to be the lowest one in energy. Such an anomalous continuum response is traced to the halo structure of 11Li providing extreme low energy shift to all the expected continuum excitations. Competitions of the initial state structure (ISS) and the final state interaction (FSI) effects on the spectrum and three-body correlations in 10He are discussed. Analogous effect of the extreme low-energy shift could also be expected in other cases of 2n emitters populated in reactions with halo nuclei. Simplified example of the 10He spectrum in α knockout from 14Be, is given. We also discuss limits on the properties of 9He stemming from the observed 10He spectrum.
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