Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bose-Einstein Condensation of Strontium   We report on the attainment of Bose-Einstein condensation with ultracold
strontium atoms. We use the 84Sr isotope, which has a low natural abundance but
offers excellent scattering properties for evaporative cooling. Accumulation in
a metastable state using a magnetic-trap, narrowline cooling, and
straightforward evaporative cooling in an optical trap lead to pure condensates
containing 1.5x10^5 atoms. This puts 84Sr in a prime position for future
experiments on quantum-degenerate gases involving atomic two-electron systems.

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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: solv-int
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: nlin
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The categories of this paper are: astro-ph
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The categories of this paper are: physics
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The categories of this paper are: math
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
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The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci