Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A High Phase-Space Density Gas of NaCs Feshbach Molecules   We report on the creation of ultracold gases of bosonic Feshbach molecules of
NaCs. The molecules are associated from overlapping gases of Na and Cs using a
Feshbach resonance at 864.12(5) G. We characterize the Feshbach resonance using
bound state spectroscopy, in conjunction with a coupled-channel calculation. By
varying the temperature and atom numbers of the initial atomic mixtures, we
demonstrate the association of NaCs gases over a wide dynamic range of molecule
numbers and temperatures, reaching 70 nK for our coldest systems and a
phase-space density near 0.1. This is an important stepping-stone for the
creation of degenerate gases of strongly dipolar NaCs molecules in their
absolute ground state.

8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
14
The categories of this paper are: math-ph