Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bose-Einstein Condensation of $^{88}$Sr Through Sympathetic Cooling with
  $^{87}$Sr   We report Bose-Einstein condensation of $^{88}$Sr, which has a small,
negative s-wave scattering length ($a_{88}=-2$\,$a_0$). We overcome the poor
evaporative cooling characteristics of this isotope by sympathetic cooling with
$^{87}$Sr atoms. $^{87}$Sr is effective in this role in spite of the fact that
it is a fermion because of the large ground state degeneracy arising from a
nuclear spin of $I=9/2$, which reduces the impact of Pauli blocking of
collisions. We observe a limited number of atoms in the condensate
($N_{max}\approx 10^4$) that is consistent with the value of $a_{88}$ and the
optical dipole trap parameters.

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The categories of this paper are: eess
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The categories of this paper are: acc-phys
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The categories of this paper are: econ
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The categories of this paper are: ao-sci
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The categories of this paper are: dg-ga
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
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The categories of this paper are: stat
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The categories of this paper are: funct-an
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The categories of this paper are: gr-qc
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The categories of this paper are: nlin
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The categories of this paper are: astro-ph