Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mass-imbalanced fermionic mixture in a harmonic trap   The mass-imbalanced fermionic mixture is studied, where $N\le5$ identical
fermions interact resonantly with an impurity, a distinguishable atom. The
shell structure is explored, and the physics of a dynamic light-impurity is
shown to be different from that of the static heavy-impurity case. The energies
in a harmonic trap at unitarity are calculated and extrapolated to the
zero-range limit. In doing so, the scaling factor of the ground state, as well
as of a few excited states, is calculated. In the $2 \le N \le 4$ systems, pure
$(N+1)$ Efimov states exist for large enough mass ratio. However, no sign for a
six-body Efimov state in the $(5+1)$ system is found in the mass ratio
explored, $M/m \le 12$.

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The categories of this paper are: hep-th
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The categories of this paper are: nucl-th
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The categories of this paper are: econ
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The categories of this paper are: patt-sol
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The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int
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The categories of this paper are: funct-an
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The categories of this paper are: acc-phys
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The categories of this paper are: comp-gas
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The categories of this paper are: stat
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The categories of this paper are: hep-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
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The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph