Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Three-body properties of low-lying $^{12}$Be resonances   We compute the three-body structure of the lowest resonances of $^{12}$Be
considered as two neutrons around an inert $^{10}$Be core. This is an extension
of the bound state calculations of $^{12}$Be into the continuum spectrum. We
investigate the lowest resonances of angular momenta and parities, $0^{\pm}$,
$1^{-}$ and $2^{+}$. Surprisingly enough, they all are naturally occurring in
the three-body model. We calculate bulk structure dominated by small distance
properties as well as decays determined by the asymptotic large-distance
structure. Both $0^{+}$ and $2^{+}$ have two-body $^{10}$Be-neutron d-wave
structure, while $1^{-}$ has an even mixture of $p$ and d-waves. The
corresponding relative neutron-neutron partial waves are distributed among $s$,
$p$, and d-waves. The branching ratios show different mixtures of one-neutron
emission, three-body direct, and sequential decays. We argue for spin and
parities, $0^{+}$, $1^{-}$ and $2^{+}$, to the resonances at 0.89, 2.03, 5.13,
respectively. The computed structures are in agreement with existing reaction
measurements.

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The categories of this paper are: hep-th
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The categories of this paper are: hep-lat
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The categories of this paper are: chem-ph
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The categories of this paper are: math
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: cmp-lg
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The categories of this paper are: physics
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
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The categories of this paper are: cond-mat
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The categories of this paper are: cs