Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Anomalous population of $^{10}$He states in reactions with $^{11}$Li   Structure with the lowest energy observed in the $^{10}$He spectrum populated
in the proton knockout reaction with $^{11}$Li beam has a peak at $1.2-1.5$
MeV. This peak is usually interpreted as a resonant $0^+$ ground state of
$^{10}$He. 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 $^{10}$He. 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 $^{11}$Li
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
$^{10}$He 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 $^{10}$He spectrum in $\alpha$ knockout
from $^{14}$Be, is given. We also discuss limits on the properties of $^{9}$He
stemming from the observed $^{10}$He spectrum.

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The categories of this paper are: math
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: astro-ph
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The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
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The categories of this paper are: econ
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The categories of this paper are: supr-con
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The categories of this paper are: comp-gas
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The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
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The categories of this paper are: physics
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The categories of this paper are: funct-an
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The categories of this paper are: cs
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The categories of this paper are: hep-lat